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Integration of piezoelectric transducers(PZT and PVDF)within polymer-matrix composites for structural health monitoring applications:new success and challenges 认领 引用
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作者 C.Tuloup W.Harizi +1 位作者 Z.Aboura Y.Meyer 《International Journal of Smart and Nano Materials》 SCIE EI 2020年第4期343-369,共27页
This article investigates the interest of using in-situ piezoelectric(PZT and PVDF)disks to perform real-time Structural Health Monitoring(SHM)of glass fiber-reinforced polymer composites submitted to var-ious tensile... This article investigates the interest of using in-situ piezoelectric(PZT and PVDF)disks to perform real-time Structural Health Monitoring(SHM)of glass fiber-reinforced polymer composites submitted to var-ious tensile loadings.The goal is to evaluate the working range and SHM potential of such embedded transducers for relatively simple mechanical loadings,with the long-term aim of using them to monitor complete 3D structures submitted to more complex loadings.SHM is performed acquiring the electrical capacitance variation of the embedded transducers.To study the potential links between the insitu capacitance signal and the global response of the loaded host specimens,a multi-instrumentation composed of external Nondestructive Testing techniques was implemented on the surfaces of the specimens to search for multi-physical couplings between these external measurements and the capacitance curves.Results confirmed the non-intrusiveness of the embedded transducers,and allowed estimating their working domain.PZT capacitance signal follows well the mechanical loadings,but the piezoceramic transducer gets damaged after a determined relatively low strain level due to its brittleness.The limits of this working domain are extended by using a stretchable PolyVinylidene Fluoride(PVDF)polymer transducer,allowing this one to perform in-situ and real-time SHM of its host tensile specimens until failure. 展开更多
关键词 Polymer-matrix composites(PMCs) in-situ piezoelectric transducer structural health monitoring nondestructive testing tensile loading PZT PVDF
基于前端聚合制备短切碳纤维增强凝胶的《聚合物基复合材料》课程案例式互动式教学 认领 引用
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作者 刘吉东 《广州化工》 CAS 2026年第2期194-197,共4页
以碳纤维复合材料为案例教学对象,通过将前端聚合制备短切碳纤维增强聚合物基复合材料的科研成果融入《聚合物基复合材料》课程教学中,对碳纤维复合材料的结构、性能和成型工艺等方面进行介绍。通过教师引导案例分析、知识点讲解、学生... 以碳纤维复合材料为案例教学对象,通过将前端聚合制备短切碳纤维增强聚合物基复合材料的科研成果融入《聚合物基复合材料》课程教学中,对碳纤维复合材料的结构、性能和成型工艺等方面进行介绍。通过教师引导案例分析、知识点讲解、学生与老师及学生与案例之间互动等多种形式,将产业需求和学科前沿研究融入课程当中,引导学生将复合材料的结构、基体、增强体、界面调控及成型工艺等相关内容串联形成体系,加强学生对聚合物基复合材料核心概念的理解,培养学生分析与解决实际问题的能力。该方案能够有效激发学生的学习兴趣,提升课堂参与度,锻炼学生的逻辑思维和自主学习能力,提高科研素养和工程实践能力。 展开更多
关键词 聚合物基复合材料 案例式教学 前端聚合 碳纤维复合材料
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青少年恒牙牙体缺损的修复难点及过渡修复的方式选择 认领 引用 被引量：5
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作者 程雅雯 李德利 +2 位作者 赵彦 夏斌 刘云松 《北京大学学报（医学版）》 CAS CSCD 北大核心 2025年第1期208-213,共6页
根据世界卫生组织界定,青少年所涵盖的年龄是10~19岁[1]。青少年时期是人类生命发展的一个独特阶段,是生理和心理发生迅猛成长的关键时期。当前,世界上青少年的数量总计高达12亿,占全球总人口的六分之一[1],因此,青少年的口腔健康受到... 根据世界卫生组织界定,青少年所涵盖的年龄是10~19岁[1]。青少年时期是人类生命发展的一个独特阶段,是生理和心理发生迅猛成长的关键时期。当前,世界上青少年的数量总计高达12亿,占全球总人口的六分之一[1],因此,青少年的口腔健康受到了愈发广泛的关注。青少年口腔情况复杂,且处于发育阶段。恒牙作为继乳牙脱落后的第二副牙列,一般在牙根形成2/3左右时开始萌出,但此时恒牙牙根尚未发育完成,这些虽已萌出,但未达到[牙合]平面的恒牙被称为年轻恒牙[2]。根尖部完全形成后的被动萌出导致恒牙在整个青少年时期持续存在临床冠长度的增加[3]。故而,青少年恒牙包括牙根未发育完成的年轻恒牙与牙根发育完成但龈缘位置仍未稳定的恒牙。 展开更多
关键词 青少年 青少年恒牙 过渡修复 CAD/CAM树脂基陶瓷 聚合瓷
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聚酰胺66固相增黏过程中分子量增长规律和谱学表征分析 认领 引用
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作者 朱平 苏晨龙 +7 位作者 王晓华 李慧 仇超 任宇婷 周勇 赵莹 董侠 王笃金 《高分子学报》 SCIE CAS CSCD 北大核心 2025年第9期1585-1596,共12页
聚酰胺66(PA66)的固相增黏是调控树脂切片分子量和机械力学性能的重要手段.本研究通过使用一维和二维核磁共振谱、基质辅助激光解吸电离飞行时间质谱分析推断固相增黏前后PA66切片样品中副产物的结构,并结合端基滴定、液质联用谱等方法... 聚酰胺66(PA66)的固相增黏是调控树脂切片分子量和机械力学性能的重要手段.本研究通过使用一维和二维核磁共振谱、基质辅助激光解吸电离飞行时间质谱分析推断固相增黏前后PA66切片样品中副产物的结构,并结合端基滴定、液质联用谱等方法,阐明了固相增黏过程中分子量增长规律、副产物种类等.甲醇抽提试验说明固相增黏在显著提高PA66切片分子量的同时使得环状PA66含量降低,尤其是重复单元数为1~4的环状PA66含量显著下降.鉴于PA66切片中各种副产物难以有效分离,本研究使用的谱学表征分析方法能够在复杂的核磁和质谱中辨识出它们的信号,有望为定量计算副产物含量奠定基础,继而为优化PA66的聚合和固相增黏工艺、提高PA66切片品质提供支持. 展开更多
关键词 PA66 固相增黏 核磁共振谱 基质辅助激光解吸飞行时间质谱质谱 环状副产物
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Thermally Conductive Poly(lactic acid)Composites with Superior Electromagnetic Shielding Performances via 3D Printing Technology 认领 引用 被引量：36
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作者 Teng-Bo Ma Hao Ma +4 位作者 Kun-Peng Ruan Xue-Tao Shi Hua Qiu Sheng-Yuan Gao Jun-Wei Gu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2022年第3期248-255,I0006,共8页
This work proposes a facile fabrication strategy for thermally conductive graphite nanosheets/poly(lactic acid)sheets with ordered GNPs(o-GNPs/PLA)via fused deposition modeling(FDM)3 D printing technology.Further comb... This work proposes a facile fabrication strategy for thermally conductive graphite nanosheets/poly(lactic acid)sheets with ordered GNPs(o-GNPs/PLA)via fused deposition modeling(FDM)3 D printing technology.Further combinations of o-GNPs/PLA with Ti3C2Txfilms prepared by vacuum-assisted filtration were carried out by"layer-by-layer stacking-hot pressing"to be the thermally conductive Ti3C2Tx/(oGNPs/PLA)composites with superior electromagnetic interference shielding effectiveness(EMI SE).When the content of GNPs was 18.60 wt%and 4 layers of Ti3C2Tx(6.98 wt%)films were embedded,the in-plane thermal conductivity coefficient(λⅡ)and EMI SE(EMI SEⅡ)values of the thermally conductive Ti3C2Tx/(o-GNPs/P LA)composites significantly increa sed to 3.44 W·m-1·K-1and 65 d B(3.00 mm),increased by 1223.1%and2066.7%,respectively,compared withλⅡ(0.26 W·m-1·K-1)and EMI SEⅡ(3 d B)of neat PLA matrix.This work offers a novel and easily route for designing and manufacturing highly thermally conductive polymer composites with superior EMI SE for broader application. 展开更多
关键词 Polymer-matrix composites(PMCs) Ti3C2Tx 3D printing Thermal conductivity Electromagnetic interference(EMI)
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Physical dispersion state and fluorescent property of Eu-complex in the Eu-complex/silicon rubber composites 认领 引用 被引量：5
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作者 温世鹏 胡水 +2 位作者 张小萍 张立群 刘力 《Journal of Rare Earths》 SCIE EI CAS 2008年第5期626-632,共7页
The fluorescent complex Eu（TTA）2（Phen）（MA） （HTTA=2-Thenoyltrifluoroacetone, Phen=1,10-phenanthroline, MA=Maleic an- hydrider） was synthesized and characterized with elemental analysis, infrared spectrum （IR）... The fluorescent complex Eu（TTA）2（Phen）（MA） （HTTA=2-Thenoyltrifluoroacetone, Phen=1,10-phenanthroline, MA=Maleic an- hydrider） was synthesized and characterized with elemental analysis, infrared spectrum （IR）, scanning electron microscope （SEM）, X-ray Diffraction（XRD）, differential scanning calorimetry（DSC）, and fluorescent measurement. To explore the effect of different physical dispersion state of Eu-complex on the fluorescent property of the Eu-complex/silicon rubber composites, various quantifies of Eu（TTA）2（phen） （MA） were mixed with silicon rubber （SIR） and peroxide to form uncured composites. These composites were vulcanized to obtain cured Eu-complex/SiR composites at 250 ℃, which was higher than the melting-point of Eu-complex. The SEM, XRD, DSC, and the fluorescent measurement of these composites showed that both the complex molecules dispersed in the silicon rubber during the melting process and the parent Eu-complex particles had positive effects on fluorescent property, whereas the re-crystallized Eu-complex particles and the aggregating complexes formed during the melting-process had negative effects on fluorescent property. For the uncured composites, their fluorescent intensities almost did not change with the increasing amount of Eu-complex. Furthermore, for the composites with small content of Eu-complex, their fluorescent intensities decreased significantly after curing, and this difference in fluorescent intensity became smaller as the content of Eu-complex increases. 展开更多
关键词 polymer-matrix composites melting blending physical dispersion state fluorescent property rare earths
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Development of EPDM composites reinforced by CNTs@SiO2for thermal protection systems of aerospace propulsion:Significant improvement in oxidation and ablation resistance properties 认领 引用 被引量：5
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作者 Li WANG Jiang LI +2 位作者 Kang LI Yiwei WANG Chenyang MA 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第2期471-481,共11页
Carbon Nanotubes(CNTs)reinforced Polymer-Matrix Composites(PMCs)is widely used as insulation materials in thermal protection system of aerospace propulsion.However,CNTs are prone to oxidation and have high thermal con... Carbon Nanotubes(CNTs)reinforced Polymer-Matrix Composites(PMCs)is widely used as insulation materials in thermal protection system of aerospace propulsion.However,CNTs are prone to oxidation and have high thermal conductivities,which makes it difficult to improve the ablation resistance of insulation materials that contain CNTs.SiO2was encapsulated onto the surface of CNTs(CNTs@SiO2),which were then added to Ethylene Propylene Diene Monomer(EPDM)rubber to prepare the insulation materials.Thermogravimetric analysis and ablation test were used to evaluate the resistance of the insulation materials to thermal oxidation and ablation.Additionally,scanning electron microscopy was performed to analyze their microstructures.Results revealed that the addition of CNTs@SiO2could visibly reduce the effects of hot corrosion and ablation on insulation materials.The C-CNTs@SiO2-1 formulation had the best ablative resistance.Further,compared with the unencapsulated formulation(C-CNTs-10),the C-CNTs@SiO2-1 formulation reduced the line ablation rate by 51%to 0.0130 mm/s after oxygen-acetylene experiments.Lastly,the ablation mechanism was investigated based on the effects of the CNTs@SiO2additive on their properties.Thus,the improvement in ablation performance may be attributed to CNTs@SiO2-induced decreases in thermal conductivity,improvement in the hot corrosion resistance in the char layer,and changes in the microstructure. 展开更多
关键词 Polymer-Matrix Composites(PMCs) Carbon Nanotubes(CNTs) Thermal properties Ablation Oxidation
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Laser ablation mechanism and performance of glass fiber-reinforced phenolic composites:An experimental study and dual-scale modelling 认领 引用 被引量：3
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作者 Ran BI Pengfei SHEN +4 位作者 Longyu ZHU Zhengzheng MA Chuyang LUO Yongfeng LI Lijian PAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第8期470-485,共16页
Both experimental and simulation approaches were employed to investigate the laser ablation mechanism and performances of Glass Fiber Reinforced Phenolic Composites(GFRP).During the ablation process,the difference in ... Both experimental and simulation approaches were employed to investigate the laser ablation mechanism and performances of Glass Fiber Reinforced Phenolic Composites(GFRP).During the ablation process,the difference in thermal conductivities of the glass fibers and the resin matrix as well as their discrepant physical and chemical reactions form a conical ablation morphology.The formation of a residual carbon layer effectively mitigates the ablation rate in the thickness direction.A higher power density results in a faster ablation rate,while a longer irradiation time leads to a larger ablation pit diameter.To account for the variation in thermal conductivity between the fiber and resin,a macro-mesoscale model was developed to differentiate the matrix from the fiber components.Finite element analysis revealed that laser irradiation leads to phenolic decomposition,glass fiber melting vaporization,and residual carbon skeleton evaporation.The dual-scale model exhibits precise prediction capabilities concerning the laser ablation process of GFRP,and its accuracy is confirmed through the comparison of simulation and experimental results for the GFRP laser ablation process.This model provides a feasible method for performance evaluation and lifetime prediction of GFRP subjected to continuous wave laser irradiation. 展开更多
关键词 Polymer-matrix composites Continuous-wave laser Microstructural analysis Ablation mechanism Finite element method
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Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites 认领 引用 被引量：7
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作者 Walter Nsengiyumva Shuncong Zhong +1 位作者 Manting Luo Bing Wang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第1期190-210,共21页
The use of terahertz time-domain spectroscopy(THz-TDS)for the nondestructive testing and evaluation(NDT&E)of materials and structural systems has attracted significant attention over the past two decades due to it... The use of terahertz time-domain spectroscopy(THz-TDS)for the nondestructive testing and evaluation(NDT&E)of materials and structural systems has attracted significant attention over the past two decades due to its superior spatial resolution and capabilities of detecting and characterizing defects and structural damage in non-conducting materials.In this study,the THz-TDS system is used to detect,localize and evaluate hidden multi-delamination defects(i.e.,a three-level multi-delamination system)in multilayered GFRP composite laminates.To obtain accurate results,a wavelet shrinkage de-noising algorithm is used to remove the noise from the measured time-of-flight(TOF)signals.The thickness and location of each delamination defect in the z-direction(i.e.,through-the-thickness direction)are calculated from the de-noised TOF signals considering the interaction between the pulsed THz waves and the different interfaces in the GFRP composite laminates.A comparison between the actual and the measured thickness values of the delamination defects before and after the wavelet shrinkage denoising process indicates that the latter provides better results with less than 3.712%relative error,while the relative error of the non-de-noised signals reaches 16.388%.Also,the power and absorbance levels of the THz waves at every interface with different refractive indices in the GFRP composite laminates are evaluated based on analytical and experimental approaches.The present study provides an adequate theoretical analysis that could help NDT&E specialists to estimate the maximum thickness of GFRP composite materials and/or structures with different interfaces that can be evaluated by the THz-TDS.Also,the accuracy of the obtained results highlights the capabilities of the THz-TDS for the NDT&E of multilayered GFRP composite laminates. 展开更多
关键词 Glass-fiber-reinforced polymer-matrix(GFRP)composites Terahertz time-domain spectroscopy(THz-TDS) Nondestructive testing and evaluation(NDT&E) Stationary wavelet transform(SWT) Thickness evaluation Delamination defects
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Continuous Deformation Monitoring by Polymermatrix Carbon Fiber Sensitive Layer 认领 引用 被引量：5
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作者 郑华升 ZHU Sirong LI Zhuoqiu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第3期705-712,共8页
Composite made of short-cut carbon fiber mat and vinyl ester resin was observed to be an effective sensor for tensile strain up to 6 000με. Based on its strain sensitivity, a skin-like sensitive layer which can cont... Composite made of short-cut carbon fiber mat and vinyl ester resin was observed to be an effective sensor for tensile strain up to 6 000με. Based on its strain sensitivity, a skin-like sensitive layer which can continuously cover the structural surface to sense strain in large area was developed. The sensitive layer was applied to continuously monitor the deformation of a simply supported beam. The result indicates that the fractional change in electrical resistance of the sensitive layer reversibly reflects the beam deformation in each section and describes the distribution of the average strain of the beam. The effect of temperature change on the monitoring was studied by monitoring tests conducted at different temperatures ranging from 20 to 80 ℃, which reveals temperature sensitivity in the sensitive layer and the temperature dependence of the piezoresistive behavior when the temperature exceeds 50 ℃. By the application of differential conaection principle, a method for temperature compensation was established and the gauge factor for the monitoring was dramatically increased. This method was verified experimentally. 展开更多
关键词 polymer-matrix carbon fiber sensitive layer strain sensitivity continuous deformation monitoring temperature compensation
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Fabrication of wear-resistant PA6 composites with superior thermal conductivity and mechanical properties via constructing highly oriented hybrid network of SiC-packed BN platelets 认领 引用 被引量：2
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作者 Jing Chen Jiaming Zhu +3 位作者 Yang Pan Hong Wu Shaoyun Guo Jianhui Qiu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第15期200-210,共11页
Herein,a strong extensional and shearing field was introduced to construct highly oriented hybrid networks of silicon carbide(SiC)-packed boron nitride(BN)platelets to fabricate high-performance wearresistant PA6 comp... Herein,a strong extensional and shearing field was introduced to construct highly oriented hybrid networks of silicon carbide(SiC)-packed boron nitride(BN)platelets to fabricate high-performance wearresistant PA6 composites.Results show that in-plane and through-plane thermal conductivity(TC)of the prepared PA6 composites with a total filler loading of 20 wt.%reached 1.31 and 0.35 W/(m K),352%and 25%higher than those of pure PA6,respectively.It is attributed to the highly oriented hybrid network that facilitates the formation of efficient thermal conductivity pathways.Temperature monitoring results during friction confirm that high TC favors the friction heat dissipation performance.Meanwhile,the yield strength of PA6 composites increased by 39.1%and they still have excellent ductility with an elongation at break of 207.1%.Finally,the wear rate of PA6 composites decreased sharply by 92.5%.This method can be used to manufacture advanced linear bearing and guideway parts,etc。 展开更多
关键词 Polymer-matrix composites(PMCs) Hybrid Wear Thermal properties
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Significantly enhancing fracture toughness of epoxy composite with promisingγ-FeOOH@Fe2O3hybrid nanoparticles by magnetic field assistance 认领 引用 被引量：3
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作者 Guan Chen Chuanguo Ma +2 位作者 Zehao Fu Jing Wang Peibang Dai 《Nano Materials Science》 EI CAS CSCD 2022年第2期139-150,共12页
The toughening of epoxy resin(EP)and the interlaminar toughening of carbon fiber reinforced composite(CF/EP)laminates have been widely concerned.In this work,the needle-likeγ-FeOOH nanoparticles were prepared by liqu... The toughening of epoxy resin(EP)and the interlaminar toughening of carbon fiber reinforced composite(CF/EP)laminates have been widely concerned.In this work,the needle-likeγ-FeOOH nanoparticles were prepared by liquid phase deposition-air oxidation method,and then were calcined under different conditions to obtainγ-FeOOH andγ-Fe2O3 hybrid nanoparticles(γ-FeOOH@Fe2O3).Effect of calcination condition ofγ-FeOOH@-Fe2O3 and magnetic field assistance on fracture toughness(KIC)of EP was systematically investigated.Then the selectedγ-FeOOH@Fe2O3 with the best toughening effect were used to improve the mode I interlaminar fracture toughness(GIC)of CF/EP laminate.The resultingγ-FeOOH@Fe2O3 have a length of around 1μm,a diameter of around 100 nm and the Ms of 8.99–45.96 emu/g.After calcinated at 250℃ for 1 h,theγ-FeOOH@Fe2O3 containing 24 wt%FeOOH and 76 wt%Fe2O3 achieved the best toughening effect.Under a magnetic field of 0.09 T,the KIC of theγ-FeOOH@Fe2O3/EP composite(2.45 MPa m1/2) is 81.7%and 66.7%higher than that of neat epoxy and the composite without magnetic field induction,respectively.Furthermore,the GIC of theγ-FeOOH@Fe2O3/CF/EP composite(0.914 kJ/m2) is also significantly increased by 88.8%and 51.8%compared to that of CF/EP and the corresponding composite without magnetic field induction,respectively. 展开更多
关键词 A.polymer-matrix composites(PMCs) A.Carbon fibres A.Nanocomposites B.Fracture toughness
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A characteristic curve-based numerical framework for predicting strength of multi-bolted composite joints subjected to hygrothermal condition 认领 引用 被引量：2
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作者 Meijuan SHAN Ruifeng ZHANG +3 位作者 Yu GONG Fengrui LIU Libin ZHAO Ning HU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第11期265-277,共13页
Many works have been made for predicting the failure of composite joints.However,there is still lack of method for multi-bolted composite joints subjected to the hygrothermal environment.In this work,a characteristic ... Many works have been made for predicting the failure of composite joints.However,there is still lack of method for multi-bolted composite joints subjected to the hygrothermal environment.In this work,a characteristic curve-based numerical framework is proposed,which includes two main steps and shows low computational cost.Firstly,a 3D finite element model considering hygrothermal effects is established to analyze the bolt-load distribution of multi-bolted joints.Secondly,a new characteristic curve considering the hygrothermal influence is used to obtain the failure pattern and strength of composite joints.The two-,three-and four-bolted composite joints with-55℃/dry(CTD),23℃/dry(RTD)and 70℃/wet(ETW)conditions are investigated.The test outcomes present good agreement with predicted results,which illustrates the effectiveness and applicability of the proposed method.Meanwhile,it is shown that the environmental condition affects the bolt-load ratio slightly,but does not change the location of the key loaded hole.Furthermore,deviations of the strengths in CTD and ETW conditions are about 5%and-16%from that in the RTD condition,respectively.The environmental condition does not affect the failure modes of two-and three-bolted joints,whereas changes the failure mode of the four-bolted joint.The proposed method is efficient,reliable and needs only linear elastic FE analysis,making it applicable for engineering practice. 展开更多
关键词 Polymer-matrix composite Hygrothermal condition Multi-bolted joint Strength FE analysis Characteristic curve
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In vitro study of the PLLA-Mg65Zn30Ca5composites as potential biodegradable materials for bone implants 认领 引用 被引量：2
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作者 Taolei Wang Chao Lin +3 位作者 Dan Batalu Lu Zhang Jingzhou Hu Wei Lu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第6期2009-2018,共10页
PLLA-magnesium composites have been widely investigated as potential biodegradable materials for bone implants.Lower/higher corrosion resistance of the crystalized/amorphous magnesium alloys allows tailoring of biodeg... PLLA-magnesium composites have been widely investigated as potential biodegradable materials for bone implants.Lower/higher corrosion resistance of the crystalized/amorphous magnesium alloys allows tailoring of biodegradability rate.In this work,the amorphous Mg65Zn30Ca5was investigated versus traditional crystalized Mg65Zn30Ca5,and a PLLA-Mg65Zn30Ca5composite has been successfully fabricated using hot injection process.Furthermore,the high corrosion resistance of the amorphous Mg65Zn30Ca5prevented the high alkalization and deterioration of mechanical strength.In addition,the high Zn content intended to improve the glass forming ability,also enhances the anti-bacterial property of the PLLA-Mg65Zn30Ca5composite.The remarkable performance of the PLLA-Mg65Zn30Ca5composite shows its promising application in bone repair and tissue regeneration. 展开更多
关键词 Polymer-matrix composites(PMCs) Magnesium glasses Corrosion Mechanical properties
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Structure and Properties of Natural Rubber/Zinc Disorbate Composite 认领 引用 被引量：2
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作者 ZENG Zongqiaiig LI Yongzhen +1 位作者 YU Heping WANG Qifang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第6期1309-1314,共6页
The natural rubber/zinc disorbate composite was prepared by the in situ formation of zinc disorbate from zinc oxide and sorbic acid in natural rubber. The structure variations of fillers during mixing and vulcanizatio... The natural rubber/zinc disorbate composite was prepared by the in situ formation of zinc disorbate from zinc oxide and sorbic acid in natural rubber. The structure variations of fillers during mixing and vulcanization processes were studied by X-ray diffraction(XRD) and Fourier-transform infrared spectroscopy(FTIR). The effects of zinc disorbate amount on processing performance and glass transition temperature(Tg) of compounds and the mechanical properties of vulcanizates were also determined. The XRD and FTIR analyses results indicate that the zinc disorbate is formed from the reaction of zinc oxide and sorbic acid during the mixing procedure followed by graft copolymerizing with NR molecules to form composite networks during vulcanization, which is initiated by dicumyl peroxide. Thus the mechanical properties of NR-based composite are increased significantly and Tg shifted towards to higher temperature. 展开更多
关键词 polymer-matrix composites mechanical properties cure interphase
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Bio Caryota Fiber Reinforced Polymer Composites: Mechanical Properties and Vibration Behavior Analysis 认领 引用 被引量：4
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作者 Kayaroganam Palanikumar Vijayakumar Subbiah 《Journal of Bionic Engineering》 SCIE EI CSCD 2019年第3期480-491,共12页
Polymer composites reinforced with the biofibers are found to have improved applications in many fields and also they can reduce the environmental effect. In this work, caryota-a new natural fiber for polymer composit... Polymer composites reinforced with the biofibers are found to have improved applications in many fields and also they can reduce the environmental effect. In this work, caryota-a new natural fiber for polymer composites is fabricated and their tensile, flexural and impact properties are estimated to be used in economical and lightweight load carrying structures. Laminates at different weight fraction (wt%) of 10 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt% and 45 wt% are manufactured using a compression molding technique. Results asserted that the unidirectional arrangement having 40 wt% fiber posses good properties. Also the dynamic characteristics such as natural frequency and damping study are carried out for different wt% of unidirectional caryota fiber reinforced composite laminates by ex? perimental modal analysis. From this study, it has been asserted that by using the caryota fiber reinforced polyester composites, the traditional synthetic fiber can be replaced especially in automobile sector. If the caryota fiber reinforced composite material is applied properly, then its application fields will be improved. 展开更多
关键词 natural fiber caryota fiber reinforcements polymer-matrix composites (PMCs) mechanical properties vibration analysis
Modifying glass fiber surface with grafting acrylamide by UV-grafting copolymerization for preparation of glass fiber reinforced PVDF composite membrane 认领 引用 被引量：4
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作者 Nan Luo Hui Zhong +2 位作者 Min Yang Xing Yuan Yaobo Fan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第1期208-217,共10页
Experimental design and response surface methodology（RSM） were used to optimize the modification of conditions for glass surface grafting with acrylamide（AM） monomer for preparation of a glass fiber reinforced pol... Experimental design and response surface methodology（RSM） were used to optimize the modification of conditions for glass surface grafting with acrylamide（AM） monomer for preparation of a glass fiber reinforced poly（vinylidene fluoride）（PVDF） composite membrane（GFRP-CM）. The factors considered for experimental design were the UV（ultraviolet）-irradiation time, the concentrations of the initiator and solvent, and the kinds and concentrations of the silane coupling agent. The optimum operating conditions determined were UV-irradiation time of 25 min, an initiator concentration of 0–0.25 wt.%,solvent of N-Dimethylacetamide（DMAC）, and silane coupling agent KH570 with a concentration of 7 wt.%. The obtained optimal parameters were located in the valid region and the experimental confirmation tests conducted showed good accordance between predicted and experimental values. Under these optimal conditions, the water absorption of the grafted modified glass fiber was improved from 13.6% to 23%; the tensile strength was enhanced and the peeling strength of the glass fiber reinforced PVDF composite membrane was improved by 23.7% and 32.6% with an AM concentration at 1 wt.% and 2 wt.%. The surface composition and microstructure of AM grafted glass fiber were studied via several techniques including Field Emission Scanning Electron Microscopy（FESEM）, Fourier transform infrared spectroscopy-attenuated total reflectance（FTIR-ATR） and energy dispersive X-ray spectroscopy（EDX）. The analysis of the EDX and FTIR-ATR results confirmed that the AM was grafted to the glass fiber successfully by detecting and proving the existence of nitrogen atoms in the GFRP-CM. 展开更多
关键词 Glass fibers Polymer-matrix composites Coupling agents UV-grafting copolymerization Interfacial strength
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Dynamic Mechanical and Thermal Properties of Cross-linked Polystyrene/Glass Fiber Composites 认领 引用 被引量：1
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作者 ZHU Quanyao WU Fei +2 位作者 YANG Qing WANG Jun CHEN Wen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第5期780-784,共5页
Cross-linked polystyrene/glass fiber composites were fabricated using cross-linked polystyrene(CLPS)as matrix and E-glass fiber as the reinforcement.Surfaces of E-glass fibers were modified by vinyl triethoxysilane(VT... Cross-linked polystyrene/glass fiber composites were fabricated using cross-linked polystyrene(CLPS)as matrix and E-glass fiber as the reinforcement.Surfaces of E-glass fibers were modified by vinyl triethoxysilane(VTES),vinyl trimethoxysilane(VTMS)andγ-methacryloylpropyl trimethoxysilane(MPS).The treated glass fibers were analyzed by fourier transform infrared spectroscopy(FTIR).Dynamic mechanical thermal analysis(DMTA)and thermo-gravimetric analysis(TGA)were employed to investigate the effect of glass fibers surface modification on viscoelastic behavior and thermal properties.The morphology of fracture surfaces of various composites was observed by scanning electron microscopy(SEM).The results revealed that these coupling agents were connected to the surfaces of the fibers by chemical bonding.Dynamic mechanical properties as well as thermal stability of the composites were improved considerablely,but to varying degrees depending on the fiber modification.The diversities of improvement of properties were attributed to the different interfacial adhesion between CLPS matrix and the glass fibers. 展开更多
关键词 polymer-matrix composite cross-linked polystyrene(CLPS) fiber/matrix bond dynamic mechanical thermal analysis.
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Flexural Stress Homogenization Effects of Interfacial Transition Layers in Modified ZrB2-Al2O3/Epoxy Composites 认领 引用 被引量：1
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作者 WU Yicheng HE Yaiinan YU Zhiqiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第5期1003-1007,共5页
The effect of interfacial modification on flexural strength of epoxy composites filled with modified ZrB2-Al2O3 composite fillers was investigated in order to explore the stress distribution of modified composites und... The effect of interfacial modification on flexural strength of epoxy composites filled with modified ZrB2-Al2O3 composite fillers was investigated in order to explore the stress distribution of modified composites under external load.The mechanical performance of epoxy composites filled with 0 vol%,1 vol%,3 vol%and 5 vol%unmodified and modified ZrB2-Al2O3 fillers was characterized by three point bending(TPB)tests.The fracture surfaces of epoxy composites were observed by scanning electronic microscope(SEM).The results showed that the epoxy composite reinforced by 1 vol%modified fillers exhibited the optimal mechanical performance.According to the Von Mises stress contours simulated by finite element models(FEM)and the SEM images,it was shown that the modified ZrB2-Al2O3 multiphase fillers could homogenize the stress in the epoxy composites due to the transition effect resulted from the interfacial modification layers on the surfaces of multiphase fillers.It contributed to the improvement of mechanical performance of epoxy composites further. 展开更多
关键词 surface modification stress transfer polymer-matrix composites(PMCs) finite element analysis(FEA)
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Skin-inspired self-healing polycaprolactone-based composite induced by photo/electro stimuli for highly absorb e d and stable electromagnetic interference shielding 认领 引用 被引量：1
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作者 Minghuan Hou Jian Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第30期171-182,共12页
The endeavor to attain prolonged stability and heightened electromagnetic interference shielding effec-tiveness(EMI SE)in polymer-matrix composites remains an arduous pursuit,particularly when subjected to external me... The endeavor to attain prolonged stability and heightened electromagnetic interference shielding effec-tiveness(EMI SE)in polymer-matrix composites remains an arduous pursuit,particularly when subjected to external mechanical trauma or adverse environmental conditions.In this context,a self-healing and efficient EMI shielding polycaprolactone(PCL)composite with a unique electromagnetic gradient and interface-metalized segregated structure is assembled through layer-by-layer casting and a hot-pressing process.The combined effect of the induction of the electromagnetic gradient layer and the massive mul-tiple interface reflection and scattering from the segregated-like structure results in an exceptional EMI SE of 57.0 dB and a low reflection(R)value of only 0.28.Additionally,the composite boasts impressive photothermal and electrothermal properties,allowing for self-healing under solar irradiation or electri-cal stimulation.Remarkably,this self-healing capability has been demonstrated through five cutting and healing cycles,exhibiting an impressive EMI SE retention rate of 88%.Consequently,the composite with rapid photo/electro-driven self-healing properties will be able to maintain EMI shielding performance. 展开更多
关键词 Polymer-matrix composites Multifunctional composites Photo/electro-driven Self-healing Electromagnetic interference shielding
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