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Multistage microcellular waterborne polyurethane composite with optionally low-reflection behavior for ultra-efficient electromagnetic interference shielding 认领 引用 被引量：7
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作者 Jianming Yang Hu Wang +4 位作者 Hexin Zhang Peng Lin Hong Gao Youyi Xia Xia Liao 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第5期132-140,共9页
Electromagnetic interference(EMI)shielding materials with superior shielding efficiency and low-reflection properties hold promising potential for utilization across electronic components,precision instruments,and fif... Electromagnetic interference(EMI)shielding materials with superior shielding efficiency and low-reflection properties hold promising potential for utilization across electronic components,precision instruments,and fifth-generation communication equipment.In this study,multistage microcellular waterborne polyurethane(WPU)composites were constructed via gradient induction,layer-by-layer casting,and supercritical carbon dioxide foaming.The gradient-structured WPU/ironcobalt loaded reduced graphene oxide(FeCo@rGO)foam serves as an impedance-matched absorption layer,while the highly conductive WPU/silver loaded glass microspheres(Ag@GM)layer is employed as a reflection layer.Thanks to the incorporation of an asymmetric structure,as well as the introduction of gradient and porous configurations,the composite foam demonstrates excellent conductivity,outstanding EMI SE(74.9 dB),and minimal reflection characteristics(35.28%)in 8.2-12.4 GHz,implying that more than 99.99999%of electromagnetic(EM)waves were blocked and only 35.28%were reflected to the external environment.Interestingly,the reflectivity of the composite foam is reduced to 0.41%at 10.88 GHz due to the resonance for incident and reflected EM waves.Beyond that,the composite foam is characterized by low density(0.47 g/cm3)and great stability of EMI shielding properties.This work offers a viable approach for craft-ing lightweight,highly shielding,and minimally reflective EMI shielding composites. 展开更多
关键词 Electromagnetic interference shielding Supercritical carbon dioxide(ScCO2)foaming Low reflectivity Multilayered structure Microcellular
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Microcellular Foaming-derived Superlight Ultra-high Molecular Weight Poly(vinylidene fluoride)Foams for Outstanding Thermal InsulationApplications 认领 引用 被引量：1
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作者 Chao Wei Jia-Long Chai +1 位作者 Shuai Li Gui-Long Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第10期1837-1849,共13页
Poly(vinylidene fluoride)(PVDF)foam has received widespread attention due to its high strength,and excellent combination of flame-retardancy,antibacterial performance,and chemical stability.However,the foaming ability... Poly(vinylidene fluoride)(PVDF)foam has received widespread attention due to its high strength,and excellent combination of flame-retardancy,antibacterial performance,and chemical stability.However,the foaming ability of conventional PvDF is severely limited by its rapid crystallization kinetics and poor melt strength.Although ultra-high molecular weight PVDF(H-PVDF)theoretically offers prolonged melt elasticity favorable for foaming,the extremely high melt viscosity poses substantial processing challenges,and its foaming behavior has remained largely unexplored.To address these issues,this study proposes a novel fabrication strategy combining solvent casting with microcellular foaming to prepare H-PVDF foams.Dynamic mechanical analysis and differential scanning calorimetry reveal that extensive chain entanglements in H-PVDF impose constraints on crystallization and significantly enhance melt strength.By tuning the processing parameters,the distinctive foaming be-havior of H-PVDF under various conditions is systematically elucidated.Remarkably,a record-high expansion ratio of 55.6-fold is achieved,ac-companied by a highly uniform and fine cellular structure.The resulting H-PVDF foams exhibit a low thermal conductivity of 31.8 mW·m-1.K-1,while retaining excellent compressive strength,flame-retardancy,and hydrophobicity.These outstanding properties highlight the great potential of H-PVDF foams as the thermal insulation materials for applications in aerospace,energy infrastructure,and other extreme environments. 展开更多
关键词 Microcellular foaming Ultra-high molecular weight PVDF Superlight Thermal insulation Flame-retardancy
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Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding 认领 引用 被引量：11
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作者 Guolong Sang Pei Xu +4 位作者 Tong Yan Vignesh Murugadoss Nithesh Naik Yunsheng Ding Zhanhu Guo 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第10期131-146,共16页
Lightweight microcellular polyurethane(TPU)/carbon nanotubes(CNTs)ickel-coated CNTs(Ni@CNTs)/polymerizable ionic liquid copolymer(PIL)composite foams are prepared by non-solvent induced phase separation(NIPS).CNTs and... Lightweight microcellular polyurethane(TPU)/carbon nanotubes(CNTs)ickel-coated CNTs(Ni@CNTs)/polymerizable ionic liquid copolymer(PIL)composite foams are prepared by non-solvent induced phase separation(NIPS).CNTs and Ni@CNTs modified by PIL provide more heterogeneous nucleation sites and inhibit the aggregation and combination of microcellular structure.Compared with TPU/CNTs,the TPU/CNTs/PIL and TPU/CNTs/Ni@CNTs/PIL composite foams with smaller microcellular structures have a high electromagnetic interference shielding effectiveness(EMI SE).The evaporate time regulates the microcellular structure,improves the conductive network of composite foams and reduces the microcellular size,which strengthens the multiple reflections of electromagnetic wave.The TPU/10CNTs/10Ni@CNTs/PIL foam exhibits slightly higher SE values(69.9 dB)compared with TPU/20CNTs/PIL foam(53.3 dB).The highest specific EMI SE of TPU/20CNTs/PIL and TPU/10CNTs/10Ni@CNTs/PIL reaches up to 187.2 and 211.5 dB/(g cm−3),respectively.The polarization losses caused by interfacial polarization between TPU substrates and conductive fillers,conduction loss caused by conductive network of fillers and magnetic loss caused by Ni@CNT synergistically attenuate the microwave energy. 展开更多
关键词 Polyurethane Nanocomposites Microcellular Electromagnetic interference shielding
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Effect of Graphene Surface Functional Groups on the Mechanical Property of PMMA Microcellular Composite Foams 认领 引用 被引量：4
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作者 LI Meijuan CHENG Ping +2 位作者 LIU Cheng SHEN Qiang ZHANG Lianmeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第3期717-722,共6页
The functional groups on graphene sheets surface affect their dispersion and interfacial adhesion in polymer matrix.We compared the mechanical property of polymethymethacrylate(PMMA)microcellular foams reinforced with... The functional groups on graphene sheets surface affect their dispersion and interfacial adhesion in polymer matrix.We compared the mechanical property of polymethymethacrylate(PMMA)microcellular foams reinforced with graphene oxide(GO)and reduced graphene oxide(RGO)to investigate this influence of functional groups.RGO sheets were fabricated by solvent thermal reduction in DMF medium.UV-Vis,FT-IR and XPS analyses indicate the difference of oxygen-containing groups on GO and RGO sheets surface.The observation of SEM illustrates that the addition of a smaller number of GO or RGO sheets causes a fine cellular structure of PMMA foams with a higher cell density(about 1011 cells/cm3)and smaller cell sizes(about 1-2μm)owing to their remarkable heterogeneous nucleation effect.Compared to GO reinforced foams,the RGO/PMMA foams own lower cell density and bigger cell size in their microstructure,and their compressive strength is lower even when the reinforcement contents are the same and the foam bulk density is higher.These results indicate that the oxygen-containing groups on GO sheets’surface are beneficial to adhere CO2 to realize a larger nucleation rate,and their strong interaction with PMMA matrix improves the mechanical property of PMMA foams. 展开更多
关键词 graphene surface functional groups PMMA microcellular composite foams mechanical property
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Lightweight,Strong and High Heat-Resistant Poly(lactide acid)Foams via Microcellular Injection Molding with Self-Assembly Nucleating Agent 认领 引用 被引量：4
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作者 Xiao-Hu Bing Wen-Yu Ma +5 位作者 Ming-Hui Wu Peng Gao Xiao Zhou Hai-Bin Luo Long Wang Wen-Ge Zheng 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2024年第6期739-750,共12页
Poly(lactide acid)(PLA)foams have shown considerable promise as eco-friendly alternatives to nondegradable plastic foams,such as polystyrene(PS)foams.Nevertheless,PLA foam typically suffers from low heat-resistance an... Poly(lactide acid)(PLA)foams have shown considerable promise as eco-friendly alternatives to nondegradable plastic foams,such as polystyrene(PS)foams.Nevertheless,PLA foam typically suffers from low heat-resistance and poor cellular structure stemming from its inherent slow crystallization rate and low melt strength.In this study,a high-performance PLA foam with well-defined cell morphology,exceptional strength and enhanced heat-resistance was successfully fabricated via a core-back microcellular injection molding(MIM)process.Differential scanning calorimetry(DSC)results revealed that the added hydrazine-based nucleating agent(HNA)significantly increased the crystallization temperature and accelerated the crystallization process of PLA.Remarkably,the addition of a 1.5 wt%of HNA led to a significant reduction in PLA’s cell size,from 43.5µm to 2.87µm,and a remarkable increase in cell density,from 1.08×107cells/cm3to 2.15×1010cells/cm3.This enhancement resulted in a final crystallinity of approximately 55.7%for the PLA blend foam,a marked improvement compared to the pure PLA foam.Furthermore,at 1.5 wt%HNA concentration,the tensile strength and tensile toughness of PLA blend foams demonstrated remarkable improvements of 136%and 463%,respectively.Additionally,the Vicat softening temperature of PLA blend foam increased significantly to 134.8°C,whereas the pure PLA foam exhibited only about 59.7℃.These findings underscore the potential for the preparation of lightweight injection-molded PLA foam with enhanced toughness and heat-resistance,which offers a viable approach for the production of high-performance PLA foams suitable for large-scale applications. 展开更多
关键词 Poly(lactide acid) Nucleating agent Microcellular injection molding Heat-resistance Toughness
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Microcellular Foaming of Plasticized Thin PC Sheet I.Effects of Processing Conditions 认领 引用 被引量：2
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作者 陈浩 管蓉 +3 位作者 ZHAO Jingzuo JIANG Shufang KE Zhao ZHA Shangwen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第2期235-242,共8页
Novel microcellular foams using thin plasticized PC sheet were prepared by compression molding. The measurement results showed that T of plasticized PC was decreased and the molecular chain mobility was increased. Dec... Novel microcellular foams using thin plasticized PC sheet were prepared by compression molding. The measurement results showed that T of plasticized PC was decreased and the molecular chain mobility was increased. Decrease in T and increase in chains mobility were contributed to the widen of foaming temperature window. Effects of processing conditions on cell size, cell density and relative density were also investigated. The experimental results show that the temperature, tributyl citrate and foaming agent content have more effects on the structures and morphology of the plasticized PC microcellular foam. Effects of experimental conditions on cell size distribution have also been discussed. 展开更多
关键词 plasticization microcellular foam polycarbonate compression molding
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Cell structure of microcellular combustible object foamed by supercritical carbon dioxide 认领 引用 被引量：2
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作者 Ya-jun Ding San-jiu Ying +1 位作者 Zhong-liang Xiao Xu Wu 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2019年第3期419-425,共7页
In order to solve the issue that the combustible objects for cased telescoped ammunition (CTA) didn't burn completely during the combustion process, the microcellular combustible objects were foamed with numerous ... In order to solve the issue that the combustible objects for cased telescoped ammunition (CTA) didn't burn completely during the combustion process, the microcellular combustible objects were foamed with numerous cells in the micron order to improve the combustion performance by the supercritical carbon dioxide (SCeCO2) foaming technology. As the cell structure determined the combustion properties of microcellular combustible objects, the solubility of SCeCO2 dissolved into the combustible objects was obtained from the gravimetric method, and scanning electron microscope (SEM) was applied to characterize the cell structure under various process conditions of solubility, foaming temperature and foaming time. SEM images indicate that the cell diameter of microcellular combustible objects is in the level of 1 mm and the cell density is about 1011 cell,cm^-3. The microcellular combustible objects fabricated by the SCeCO2 foaming technology are smooth and uniform, and the high specific surface area of cell structure can lead to the significant combustion performance of microcellular combustible object for CTA in the future. 展开更多
关键词 Cell structure Microcellular combustible object Solubility Foaming temperature Foaming time
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Research on the Dynamic Compressibility of Polyurethane Microcellular Elastomer and its Application for Impact Resistance 认领 引用
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作者 Zhi-Ying Zhao Hao Jiang +3 位作者 Xiao-Dong Li Xu-Dong Zhang Xing Su Mei-Shuai Zou 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2024年第8期1185-1197,共13页
The packaging materials with cushioning performance are used to prevent the internal contents from being damaged by the impact and vibration of external forces.The polyurethane microcellular elastomers(PUMEs)can absor... The packaging materials with cushioning performance are used to prevent the internal contents from being damaged by the impact and vibration of external forces.The polyurethane microcellular elastomers(PUMEs)can absorb energy through cell collapse and molecular chain creep.In this study,PUMEs with different densities were investigated by scanning electron microscopy,dynamic mechanical analysis and dynamic compression tests.PUMEs exhibited significant im pact resistance and the maximum peak stress attenuation ratio reached 73.33%.The protective equipment was made by PUME with the optimal density of 600 kg/m3,and then the acceleration sensing device installed with the same protective equipment fell from a height of 3,5 and 10 m to evaluate the energy-absorbing property and reusability of PUMEs.The results showed that PUMEs equipment reduced the peak acceleration of the device by 93.84%,with a maximum deviation of 9%between actual test and simulation,and shortened the impact time of first landing by 57.39%.In addition,the equipment PUMEs equipment could effectively reduce the stress on the protected items. 展开更多
关键词 Polyurethane microcellular elastomer Impact velocity Stress attenuation ratio Impact resistance
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Relationship between Microcellular Foaming Injection Molding Process Parameters and Cell Size 认领 引用
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作者 胡广洪 姜朝东 崔振山 《Journal of Donghua University(English Edition)》 EI CAS 2008年第3期308-313,共6页
In order to study the relationship between the main process parameters and the cell size, the mathematical model of cell growth of microcellular foaming injection process is built. Then numeric simulation is employed ... In order to study the relationship between the main process parameters and the cell size, the mathematical model of cell growth of microcellular foaming injection process is built. Then numeric simulation is employed as experimental method, and the Taguchi method is used to analyze significance of effect of process parameters on the cell size. At last the process parameters are focused on melt temperature, injection time, mold temperature and pretidied volume. The significance order from big to small of the effect of each process parameters on cell size is melt temperature, pre-filled volume, injection time, and mold temperature. On the basis of above research, the effect of each process parameter on cell size is further researched. Appropriate reduction of the melt temperature and increase of the pre-filled volume can optimize the cell size effectively, while the effects of injection time and mold temperature on cell size are less significant. 展开更多
关键词 Microcellular foaming injection molding process parameters cell size numeric simulation Taguchi method
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Synthesis and Compressive Response of Microcellular Foams Fabricated from Thermally Expandable Microspheres 认领 引用 被引量：4
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作者 Rui-Zhi Zhang Ju Chen +6 位作者 Mao-Wei Huang Jian Zhang Guo-Qiang Luo Bao-Zhen Wang Mei-Juan Li Qiang Shen Lian-Meng Zhang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2019年第3期279-288,共10页
Cellular foams are widely applied as protective and energy absorption materials in both civil and military fields. A facile and simple one-step heating method to fabricate polymeric foams is measured by adopting therm... Cellular foams are widely applied as protective and energy absorption materials in both civil and military fields. A facile and simple one-step heating method to fabricate polymeric foams is measured by adopting thermally expandable microspheres(TEMs). The ideal foaming parameters for various density foams were determined. Moreover, a mechanical testing machine and split Hopkinson bar(SHPB) were utilized to explore the quasi-static and dynamic compressive properties. Results showed that the cell sizes of the as-prepared TEMs foams were in the micrometer range of 11 μm to 20 μm with a uniform cell size distribution. All the foams exhibited good compressive behavior under both quasi-static and high strain rate conditions, and were related to both foam densities and strain rates. The compressive strength of the TEMs foams at 8400s-1 was up to 4 times higher than that at 10-4s-1. The effects exerted by the strain rate and sample density were evaluated by a power law equation. With increasing density, the strain rate effect was more prominent. At quasistatic strain rates below 3000s-1 regime, initial cell wall buckling and subsequent cellular structure flattening were the main failure mechanisms. However, in the high strain rate(HSR) regime(above 5000s-1), the foams were split into pieces by the following transverse inertia force. 展开更多
关键词 Thermally expandable microspheres Compressive response Split Hopkinson bar(SHPB) Microcellular Failure mechanism
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Effect of film types on thermal response,cellular structure,forming defects and mechanical properties of combined in-mold decoration and microcellular injection molding parts 认领 引用 被引量：1
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作者 Wei Guo Zhihui Yu +3 位作者 Wenting Wei Zhenghua Meng Huajie Mao Lin Hua 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第33期98-108,共11页
Different types of polymer films were used in the combined in-mold decoration and microcellular injection molding(IMD/MIM)process.The multiphase fluid-solid coupled heat transfer model was established to study the the... Different types of polymer films were used in the combined in-mold decoration and microcellular injection molding(IMD/MIM)process.The multiphase fluid-solid coupled heat transfer model was established to study the thermal response at the melt filling stage in the IMD/MIM process.It was found that the temperature distributed asymmetrically along the thickness direction due to the changed heat transfer coefficient of the melt on the film side.When polyethylene terephthalate(PET)films were applied,the temperature of the melt-film interface increased faster and to be higher at the end of melt filling stage in comparison with the application of polycarbonate(PC)and thermoplastic polyurethane(TPU)films.And the effects of film types on the cellular structure,forming defects and mechanical properties of IMD/MIM parts were also studied experimentally.The results showed that the film types had no obvious effect on the cells size in the transition layer and the mechanical properties of the parts.Under certain film thickness,the offset distance of core layer was the largest with PET film used,while the offset distance was the smallest with TPU film used.And similar results were found for the warpage of the parts.However,an exactly opposite change occurred for the thickness of film-side transition layer and the bubble marks on the surface of the parts. 展开更多
关键词 Microcellular injection molding In-mold decoration Thermal response Cellular structure Forming defects Mechanical properties
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Process of Microcellular Propellants with Adjustable Skin Thickness 认领 引用
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作者 YING Sanjiu CHEN Xiru LUO Yuanxiang 《Defence Technology（防务技术）》 CAS 2013年第1期70-74,共5页
Microcellular propellants show a vast applicable prospect due to their special shell-pore structure. The effects of saturation pressure and desorption time on skin thickness are studied. The skin thickness is observed... Microcellular propellants show a vast applicable prospect due to their special shell-pore structure. The effects of saturation pressure and desorption time on skin thickness are studied. The skin thickness is observed and measured using scanning electron microscope (SEM). The results show that the skin thickness decreases when saturation pressure increases from 15 MPa to 30 MPa. In contrast, the skin thickness increases as the desorption time changes from 2 min to 20 min.Therefore, the microcellular propellants with adjustable skin thickness can be obtained under the variable process conditions such as saturation pressure and desorption time. 展开更多
关键词 materials experiment microcellular propellant skin thickness saturation pressure desorption time supercritical CO2 fluid
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Electroless copper plating on microcellular polyurethane foam 认领 引用 被引量：8
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作者 田庆华 郭学益 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第S1期283-287,共5页
In order to obtain substrates with good conductive foam for high porosity foam metal materials used in the metal electrodes,the technique of electroless copper plating on the microcellular polyurethane foam with pore ... In order to obtain substrates with good conductive foam for high porosity foam metal materials used in the metal electrodes,the technique of electroless copper plating on the microcellular polyurethane foam with pore size of 0.3 mm was investigated.The main factors affecting the deposition rate such as the solution composition,temperature,pH value and adding ultrasonic were explored.The results show that the optimum process conditions are CuSO4 16 g/L,HCHO 5 mL/L,NaKC4H4O6 30 g/L,Na2EDTA 20 g/L,K4Fe(CN)6 25 mg/L,pH value of 12.5-13.0 and temperature of 40-50℃.Under these technical conditions, the process has excellent bath stability.Adding ultrasonic on the process can elevate the deposition rate of copper by 20%-30%.The foam metal material with a porosity of 92.2%and a three-dimensional network structure,was fabricated by electro-deposition after the electroless copper plating. 展开更多
关键词 electroless copper plating microcellular polyurethane foam deposition rate foam metal material
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Generation of Microcellular Biodegradable Polycaprolactone Foams in Supercritical Carbon Dioxide 认领 引用 被引量：5
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作者 Xu Qun Ren Xian-wen +2 位作者 Chang Yu-ning Yu Long Wang Jing-wu 《合成化学》 CAS 2004年第Z1期113-113,共1页
关键词 supercritical CO2 biodegradable polycaprolactone microcellular
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Activated Carbon-derived Polyester Elastomer Foams with Tailored Structure and Blackness for High-performance Thermally Insulating Applications 认领 引用
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作者 Xu‑Jiang Sun Yan‑Ru Zhang +4 位作者 Jia‑Peng Ma Xu Wang Ke‑Jian Cui Ting‑Ting Feng Gui‑Long Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第7期2258-2268,共11页
Lightweight materials are essential for advanced green manufacturing and ecological sustainability because they reduce energy consumption,minimize pollution,and improve resource utilization.Herein,a reinforcement stra... Lightweight materials are essential for advanced green manufacturing and ecological sustainability because they reduce energy consumption,minimize pollution,and improve resource utilization.Herein,a reinforcement strategy utilizing activated carbon(AC)as a functional filler to enhance the foaming behavior of thermoplastic polyester elastomer(TPEE)was developed,enabling the successful fabrication of lightweight,high-strength,and elastic TPEE/AC foams with superior hydrophobic and thermally insulating performance using environmentally friendly microcellular foaming technology.The uniform dispersion of AC enhanced the melt strength and the solubility of CO2,thereby significantly improving the foaming behavior,resulting in refined cell structures and reduced shrinkage.The optimized T-A-5 foam achieved a high expansion ratio(16.0),low shrinkage ratio(70.0%),and high recovery ratio(79.4%),outperforming the pure TPEE foam by 15.9%,12.3%,and212.6%,respectively.Moreover,the viscoelastic properties of TPEE/AC composites tested under two different conditions revealed contrasting trends in loss factor,indicating that the influence of fillers on TPEE viscoelasticity is highly temperature-dependent and state-sensitive.Further,the lightness and blackness of TPEE/AC foams can be tailored by varying AC content and cellular morphology.Moreover,the TPEE/AC foams exhibited improved compressive strength,low thermal conductivity(35.9 m W·m–1·K–1),and high hydrophobicity(122.5°).This study provides an effective strategy for designing high-performance TPEE foams with significant potential for energy-saving and environment-friendly applications. 展开更多
关键词 TPEE foam Activated carbon Microcellular foam Blackness Thermal insulation
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添加异相成核剂作用下MIM/IMD成型界面鼓包缺陷抑制方法 认领 引用
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作者 于盛睿 邱黎明 +8 位作者 滑海涛 祝博恒 姜燕 何利楠 李青洲 董春法 罗伟 刘晓敏 周华民 《工程塑料应用》 EI CAS CSCD 北大核心 2026年第7期101-115,共15页
微孔发泡模内表面装饰复合成型(MIM/IMD)是制备高表观质量、轻量化聚合物制品的重要成型方法,装饰膜与聚合物基体之间的可靠黏结是该工艺成功的关键。然而,装饰膜的阻隔特性导致成型过程中气体逃逸困难,易积聚于膜-基界面,形成鼓包缺陷... 微孔发泡模内表面装饰复合成型(MIM/IMD)是制备高表观质量、轻量化聚合物制品的重要成型方法,装饰膜与聚合物基体之间的可靠黏结是该工艺成功的关键。然而,装饰膜的阻隔特性导致成型过程中气体逃逸困难,易积聚于膜-基界面,形成鼓包缺陷并降低界面黏结强度,严重制约MIM/IMD工艺应用。针对上述问题,本文分析MIM/IMD成型过程中泡孔的动态演变规律,揭示鼓包缺陷形成机制,提出通过引入异相成核剂纳米碳酸钙(nano-CaCO3)抑制鼓包缺陷、增强界面黏结强度的新方法。该方法利用nano-CaCO3的异相成核作用,提高泡孔成核密度、缩减泡孔尺寸,从而限制充模阶段熔体流动前沿泡孔的过度生长,减轻熔体坍塌与气体逸散,从而抑制鼓包缺陷的形成。以nano-CaCO3含量为变量开展成型试验,通过对比不同含量下MIM/IMD制品的泡孔形貌、表面质量、鼓包覆盖率、结晶度及力学性能,验证提出方法的有效性。结果表明,nano-CaCO3质量分数从0%增至6%,泡孔由不均匀的分层结构转变为细密均匀分布,平均泡孔直径从99.08μm减小至48.55μm,泡孔密度提升251.1%。泡孔结构的优化显著抑制了充模阶段的熔体坍塌与气体释放,使得未覆膜侧表面粗糙度从0.805μm降至0.412μm,覆膜侧鼓包覆盖率从7.12%降至0%,缺陷得以消除。同时,nano-CaCO3诱导β晶形成,使基体结晶度由42.53%提升至54.25%,协同泡孔细化将MIM/IMD制件的界面剥离强度与拉伸强度分别提升23.1%和17.9%,为MIM/IMD工艺中膜-基界面鼓包缺陷的消除提供了基于成核剂调控的缺陷抑制机理与调控方法。 展开更多
关键词 微孔发泡 模内表面装饰 鼓包缺陷 异相成核剂 表观质量
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聚醚嵌段酰胺的扩链改性及泡沫抗收缩策略 认领 引用
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作者 张靖 翟玉娇 +2 位作者 杨宇煊 信春玲 何亚东 《北京化工大学学报（自然科学版）》 CAS CSCD 北大核心 2026年第3期79-86,共8页
针对聚醚嵌段酰胺(PEBA)因线性分子链结构导致的熔体黏弹性低、基体强度不足,进而引发发泡倍率低、发泡温区窄和泡沫收缩严重等问题,提出采用环氧扩链剂KL−E4370B扩链改性及N2辅助气体交换抗收缩的策略。引入KL−E4370B对PEBA进行扩... 针对聚醚嵌段酰胺(PEBA)因线性分子链结构导致的熔体黏弹性低、基体强度不足,进而引发发泡倍率低、发泡温区窄和泡沫收缩严重等问题,提出采用环氧扩链剂KL−E4370B扩链改性及N2辅助气体交换抗收缩的策略。引入KL−E4370B对PEBA进行扩链改性,显著地提升了熔体黏弹性;同时,针对CO2发泡后泡沫收缩的现象,采用N2辅助气体交换技术,实现了发泡倍率的有效恢复。实验结果表明:随着改性PEBA的支化程度提高,复数黏度和储能模量均有所提高、发泡倍率提升了34.25%、发泡温区拓宽了65℃,发泡性能得到明显改善。当KL-E4370B含量为2%时,PEBA泡沫经CO2发泡的发泡倍率由22.75倍收缩至5.52倍,恢复后发泡倍率仅为6.91倍;经N2辅助气体交换后,发泡倍率提升至36.58倍,收缩后的发泡倍率高达25.64倍,仍高于CO2初始发泡倍率,发泡倍率恢复效果显著;N2辅助气体交换技术不仅为泡沫恢复提供了驱动力,且N2发泡后泡孔壁厚度变薄,说明该技术能够促进泡沫的二次长大。因此,通过扩链改性结合N2辅助气体交换的方法,可实现高倍率、抗收缩PEBA泡沫的快速制备,为解决热塑性弹性体泡沫材料的收缩问题提供了一种有效的方法。 展开更多
关键词 聚醚嵌段酰胺(PEBA) 微孔发泡 扩链改性 N2辅助气体交换 抗收缩
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A comparison study on polymeric nanocomposite foams with various carbon nanoparticles:adjusting radiation time and effect on electrical behavior and microcellular structure 认领 引用
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作者 Mohammad Aghvami-Panah Ao Wang +6 位作者 Mahyar Panahi-Sarmad Seyed Armin Seyed Esfahani Amir Abbas Seraji Mehrnaz Shahbazi Reza Ghaffarian Seifollah Jamalpour Xueliang Xiao 《International Journal of Smart and Nano Materials》 SCIE EI 2022年第3期504-528,共25页
The effect of carbon black(CB),carbon nanotube(CNT),and graphene(G)on foaming,electrical conductivity(EC),and electromagnetic interference(EMI)shielding of polystyrene(PS)foam that has been produced via microwave heat... The effect of carbon black(CB),carbon nanotube(CNT),and graphene(G)on foaming,electrical conductivity(EC),and electromagnetic interference(EMI)shielding of polystyrene(PS)foam that has been produced via microwave heating operation and supercritical carbon dioxide(CO2)was studied.Foams containing 1 wt%,CNT,and G reached over 90%porosity after 30 s and 3 min radiation time,respectively;however,PS/CB foam did not expand properly even after 3.5 min.In addition,the expansion ratio of PS/CB and PS/G was one-sixth and one-half of PS/CNT,respectively-due to the great CNT’s ability to convert microwave radiation to heat.EC of solid and porous nanocomposites has been increased via raising filler content;however,PS/CNT displayed the highest value at the same volume fractions.This ascending trend could not endure during foaming,so a remarkable optimum-point has been observed for nanocomposite foams.Eventually,EMI-shielding properties of solid and foam nanocomposites were discussed. 展开更多
关键词 Microcellular foams Polymer-matrix composites EMI shielding carbonic particles microwave
微开模发泡注塑成型参数影响规律现状及进展 认领 引用
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作者 李佳仁 辜祖珣 +3 位作者 毛海军 刘龚涵 安瑛 谢鹏程 《塑料》 CAS CSCD 北大核心 2026年第3期31-36,41,共6页
微开模发泡注塑成型工艺参数直接影响注塑发泡制品的泡孔率、泡孔特性、表面质量及其综合性能。结合微开模距离、保压压力、模具温度、微开模速率及注气参数等工艺参数,综述了微开模发泡注塑成型在工艺参数和制品特性关联规律的研究进... 微开模发泡注塑成型工艺参数直接影响注塑发泡制品的泡孔率、泡孔特性、表面质量及其综合性能。结合微开模距离、保压压力、模具温度、微开模速率及注气参数等工艺参数,综述了微开模发泡注塑成型在工艺参数和制品特性关联规律的研究进展。微开模距离为泡孔生长提供空间,直接影响泡孔尺寸和密度;保压压力及时间决定了能否将充模过程中形成的气泡重新溶解至聚合物熔体中,影响了泡孔的均匀程度及制品表面质量;熔体温度改变了熔体的黏度,从而影响泡孔成型过程。不同工艺参数相互关联,动态影响成型过程。在此基础上,结合多参数关联规律、优化减重率和力学性能的平衡关系、特殊性能工程塑料在微开模发泡注塑成型中的突破应用等,对未来研究方向进行展望。 展开更多
关键词 微开模发泡 注塑成型 泡孔特性 微开模距离 保压压力
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硫酸钙晶须的制备及其对PLA微孔发泡的影响 认领 引用
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作者 邓雯昕 李丽芬 +2 位作者 许伦能 熊少峰 余鹏 《塑料》 CAS CSCD 北大核心 2026年第1期61-66,共6页
采用盐溶液法从废弃磷石膏中制备出硫酸钙晶须(CSW),利用硅烷偶联剂KH550对其表面进行有机改性,得到mCSW。采用熔融共混的方法将mCSW加入聚乳酸(PLA)中,制备出不同mCSW含量的PLA/mCSW复合材料。然后,再通过超临界二氧化碳(scCO2)微... 采用盐溶液法从废弃磷石膏中制备出硫酸钙晶须(CSW),利用硅烷偶联剂KH550对其表面进行有机改性,得到mCSW。采用熔融共混的方法将mCSW加入聚乳酸(PLA)中,制备出不同mCSW含量的PLA/mCSW复合材料。然后,再通过超临界二氧化碳(scCO2)微孔发泡工艺制备出PLA/mCSW微孔发泡材料。研究了mCSW含量对PLA/mCSW复合材料在scCO2浸泡下的结晶性能、流变性能的影响,以及其对PLA/mCSW微孔发泡材料泡孔结构的影响。研究结果表明,当mCSW含量低于5%时,mCSW在PLA基体中分散较好。随着mCSW含量的增加,PLA在scCO2浸泡条件下的结晶度从23.6%提高至35.5%,PLA/mCSW复合材料的储能模量和熔体黏度逐渐增大,PLA/mCSW微孔发泡材料的泡孔尺寸从26.22μm降低至10.12μm,泡孔密度和体积膨胀率呈现出先增大后降低的趋势,开孔率从95.4%迅速降低至10%以下。当mCSW的含量为3%时,PLA/mCSW微孔发泡材料的泡孔结构最佳。 展开更多
关键词 聚乳酸 磷石膏 硫酸钙晶须 微孔发泡 泡孔结构
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