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Covalent organic framework ionomers enable synergistic efficient transport of protons and oxygen in medium-temperature proton exchange membrane fuel cells 认领 引用
1
作者 Zijie Lin Qing Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第1期7-9,共3页
Covalent organic framework ionomers enable synergistic efficient transport of protons and oxygen in medium-temperature proton exchange membrane fuel cells Proton exchange membrane fuel cells(PEMFCs),as clean and effic... Covalent organic framework ionomers enable synergistic efficient transport of protons and oxygen in medium-temperature proton exchange membrane fuel cells Proton exchange membrane fuel cells(PEMFCs),as clean and efficient energy technologies,are constrained in their performance enhancement by the sluggish oxygen reduction reaction(ORR)kinetics at the cathode,anode CO poisoning(e.g.,from methanol crossover)and intricate water management dilemmas[1]. 展开更多
关键词 covalent organic framework ionomers proton exchange membrane fuel cells pemfcs proton exchange membrane fuel cells sluggish oxygen reduction reaction orr kinetics protons water management dilemmas oxygen
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Covalent organic framework ionomers for medium-temperature fuel cells 认领 引用
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作者 Ping Liu Fei Yu 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2025年第4期7-8,共2页
Sustainable energy technologies,particularly fuel cells,are gaining attraction for their potential to reduce carbon emissions and provide efficient power.Proton exchange membrane fuel cells(PEMFCs)have been central to... Sustainable energy technologies,particularly fuel cells,are gaining attraction for their potential to reduce carbon emissions and provide efficient power.Proton exchange membrane fuel cells(PEMFCs)have been central to this development.However,one persistent issue with lowtemperature PEMFCs is the dehydration of Nafion ionomer at elevated temperatures,which severely limits proton conductivity.Wang et al.tackle this by introducing a covalent organic framework(COF)interwoven with Nafion,addressing the challenge of maintaining proton conductivity and oxygen transport in medium temperatures(100–120℃). 展开更多
关键词 exchange membrane fuel cells pemfcs covalent organic framework cof interwoven ionomers reduce carbon emissions medium temperature fuel cells dehydration nafion ionomer fuel cellsare sustainable energy technologiesparticularly
Improving electrochemical performance of PEM water electrolyzer by optimizing side-chain structure and content of ionomer 认领 引用 被引量：2
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作者 LYU Hong HU Ding +2 位作者 WANG Sen SUN Yong-wen ZHANG Cun-man 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第5期1760-1774,共15页
As the proton transport channel and binder within the catalytic layer(CL),the physicochemical properties of the ionomer can affect the CL microstructure and performance of the membrane electrode assembly.In this paper... As the proton transport channel and binder within the catalytic layer(CL),the physicochemical properties of the ionomer can affect the CL microstructure and performance of the membrane electrode assembly.In this paper,we select ionomers with different side-chain lengths and investigate the effects of the side-chain structure and content of the ionomers on the performance of membrane electrode assembly(MEA).Electrochemical tests show that at a mass ratio of 10 wt.%of ionomer/Ir(I/Ir),long-side-chain(LSC)ionomer exhibits the best performance(2.141 V@2.00 A/cm2,while short-side-chain(SSC)ionomer is 2.208 V@2.00 A/cm2).The MEA containing LSC ionomer shows better electrochemical performance than the SSC at the same I/Ir mass ratio,especially at high current density.The MEA containing LSC ionomer has a larger average pore size and porosity,which indicates that it may have better mass-transfer properties.From the analysis of voltage loss,it can be seen that LSC ionomers have a smaller ohmic impedance and mass transfer resistance than SSC ionomers.In conclusion,LSC ionomers are more conducive to water-gas transport,which can provide excellent water electrolysis performance.This article focuses on the optimization of ionomer side chains and content,which can enhance PEM water electrolysis performance at lower cost. 展开更多
关键词 water electrolysis membrane electrode assembly anode catalytic layer ionomer side-chain length voltage loss
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Asymmetric ionomer configuration in membrane electrode assembly for enhanced water management and performance in anion exchange membrane fuel cells 认领 引用 被引量：1
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作者 Xiaocan Wang Tengyu He +5 位作者 Jiayuan Mao Weiwei Zhang Donghai Mei Xikang Zhao Aimei Zhu Qiugen Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第6期363-372,I0009,共10页
Anion exchange membrane fuel cells(AEMFCs)are considered a more affordable technology compared to proton exchange membrane fuel cells(PEMFCs),but the performance and durability of AEMFCs are still not competent with P... Anion exchange membrane fuel cells(AEMFCs)are considered a more affordable technology compared to proton exchange membrane fuel cells(PEMFCs),but the performance and durability of AEMFCs are still not competent with PEMFCs owing to the more challenging water management,which severely hinders its development and real-life applications.In this study,we introduce the strategy to boost the performance and stability of the membrane electrode assembly(MEA)of AEMFCs by regulating the hydrophilicity of the anode and cathode ionomers.Two poly(biphenyl alkylene)ionomers with different hydrophilicity are synthesized and used to fabricate MEAs with asymmetric or symmetric ionomer configurations in the anodic and cathodic catalyst layers(CLs)for AEMFCs.Molecular dynamics(MD)simulations have revealed different diffusion rates of water in the hydrophobic anode and the hydrophilic cathode,which show the potential of this design to improve water management in AEMFCs,The effectiveness of this design is also confirmed by experimental results that the MEA with this asymmetric configuration exhibits the highest power and current densities of 1.58 W cm-2or 5.58 A cm-2,respectively,among all configurations.Furthermore,this configuration also enhances the durability,with the MEA showing a voltage decay rate of only 313.1μV h-1after 500 h of in-situ durability test at 0.2 A cm-2.This study provides new insights into the rational design of more efficient water management in MEA for high-performance AEMFCs. 展开更多
关键词 Water management Asymmetric ionomer configuration Membrane electrode assembly Anion exchange membrane fuel cells
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The insights into ionomer-catalyst interactions enabling high-efficiency CO2electroreduction in pure water 认领 引用
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作者 Rui Xue Shu Yuan +8 位作者 Rongyi Wang Tianzi Bi Guiru Zhang Huiyuan Li Jiewei Yin Liuxuan Luo Shuiyun Shen Xiaohui Yan Junliang Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第9期390-399,I0011,共10页
With the development of renewable energy,electrochemical carbon dioxide reduction reaction(CO2RR)has become a potential solution for achieving carbon neutrality.However,until now,due to issues with salt precipitate... With the development of renewable energy,electrochemical carbon dioxide reduction reaction(CO2RR)has become a potential solution for achieving carbon neutrality.However,until now,due to issues with salt precipitate and regeneration of the electrolyte,this technology faces challenges such as difficulty in maintaining long-term stable operation and excessive costs.The pure water CO2electrolyzers are believed to be the ultimate solution to eliminate the salt depreciation and electrolyte issues.This study develops an in-situ method tailored for CO2reduction in pure water.By employing distribution of relaxation times(DRT)analysis and in-situ electrochemical active surface area(ECSA)measurements,we carried out a comprehensive investigation into the mass transport and electrochemical active surface area of gas diffusion electrodes(GDE)under pure water conditions.The maximum 89%CO selectivity and high selectivity(>80%)in the range of 0-300 mA/cm2were achieved using commercial Ag nanoparticles by rational design of catalyst layer.We found that ionomers influence the CO2electrolyzers performance via affecting local pH,GDE-membrane interface,and CO2transport,while catalyst loading mainly influences the active area and CO2transport.This work provides benchmark and insights for future pure water CO2electrolyzers development. 展开更多
关键词 Carbon dioxide reduction Pure water Ionomer I/C Catalyst loading
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Three-fold optimization of Pt/ionomer interface by ionic liquid-modified MOF-808 in cathode of proton exchange membrane fuel cells 认领 引用
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作者 Huangli Yan Chengwen Yu +2 位作者 Xianming Zhang Meihua Tang Shengli Chen 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第8期84-94,共11页
The large-scale commercialization of proton exchange membrane fuel cells(PEMFCs)has been hindered by the high demand of platinum(Pt)in the cathode due to the sluggish kinetics of the oxygen reduction reaction.Reducing... The large-scale commercialization of proton exchange membrane fuel cells(PEMFCs)has been hindered by the high demand of platinum(Pt)in the cathode due to the sluggish kinetics of the oxygen reduction reaction.Reducing the amount of Pt would worsen the problems caused by the adsorption of perfluorinated sulfonic acid(PFSA)ionomers to Pt via the side chains,namely,blocking the active sites of Pt and inducing densely packed layers of fluorocarbon backbones on Pt surface to obstruct local O2transport at the Pt/PFSA interfaces.This work aims at optimizing the Pt/ionomer interface to mitigate the sulfonate adsorption and in the meantime to reduce the local O2transport resistance(Rlocal),by using a porous composite of 1-butyl-3-methylimidazolium hydrogen sulfate ionic liquid(IL)modified MOF-808(BMImHSO4@MOF-808)as additive in cathodic catalyst layer(CCL).Through detailed physical,spectroscopic and electrochemical characterizations,we demonstrate a three-fold optimization mechanism of Pt/ionomer interface structure by BMImHSO4@MOF-808:the unsaturated metal sites in MOF-808 effectively inhibit the sulfonate adsorption on Pt through coordination with the sulfonates of PFSA,thereby improving catalyst utilization;the pores in MOF-808 establish efficient transport channels for gaseous oxygen,significantly reducing Rlocal;the IL modification layers facilitate the formation of continuous proton transport networks,increasing proton conductivity.The incorporation of BMImHSO4@MOF-808 in a low-Pt CCL(0.1 mgPtcm-2)yields a peak power density of 1.9 W cm-2for PEMFC under H2-O2condition,and ca.20%increase of power density under H2-air condition as compared with conventional CCL,indicating the prospect of IL-MOF composites as an efficient additive to enhance the performance of PEMFCs. 展开更多
关键词 Proton exchange membrane fuel cells Pt/ionomer interface Local oxygen transport MOF-808 Ionic liquid Sulfonate adsorption
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Construction of efficient electrodes for CO2RR through microenvironment regulation of hydrophobic ionomer 认领 引用 被引量：2
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作者 Qingfeng Chang Gong Zhang +7 位作者 Jinxing Chen Xiaowei Du Chujun Wang Yuan Cai Yuzhe Du Peng Zhang Tuo Wang Jinlong Gong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第9期373-380,I0011,共8页
CO2reduction reaction(CO2RR)electrolyzers based on gas diffusion electrode(GDE)enable the direct mass transfer of CO2to the catalyst surface for participation in the reaction,thereby establishing an efficient... CO2reduction reaction(CO2RR)electrolyzers based on gas diffusion electrode(GDE)enable the direct mass transfer of CO2to the catalyst surface for participation in the reaction,thereby establishing an efficient three-phase reaction interface that significantly enhances current density.However,current hydrophobic modification methods face difficulties in achieving precise and substantial control over wettability,and the hydrophobic modifiers tend to significantly impair the conductivity of the electrode and ion transport capabilities.This study employs Nafion ionomers to hydrophobically modify the threedimensional catalyst layer,revealing the bifunctionality of Nafion.The fluorinated backbone of Nafion ensures the hydrophobicity of the entire catalyst layer,while its sulfonic acid groups promote ion transport,without significantly affecting the conductivity of the electrode.Furthermore,by employing modifiers with distinct wettability characteristics,a highly efficient and large-scale manipulation of the hydrophilic/hydrophobic properties of the catalyst layer was successfully realized.The electrode,constructed with silver nanopowder as a representative catalyst and modified with the hydrophobic ionomer Nafion,exhibits a substantial enhancement in both catalytic activity and durability.The optimized electrode exhibited exceptional electrocatalytic performance in both flow cell and membrane electrode assembly(MEA)configurations.Notably,in the MEA,the electrode achieved a remarkable CO Faradaic efficiency(FE)of 93.3%at a total current density of 200 mA cm-2,while maintaining stable operation for over 62 h. 展开更多
关键词 GDE CO2RR Wettability Hydrophobic ionomer
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Tailoring the Ionomer Type to Optimize Catalyst Microenvironment for Enhanced CO2 Reduction in Membrane Electrode Assemblies 认领 引用
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作者 Meng Cao Hong Miao +3 位作者 Jingchen Li Chengda Liu Xin Wang Yongzhu Fu 《Carbon Energy》 SCIE EI CSCD 2025年第12期83-92,共10页
Electrocatalytic CO2reduction reaction(CO2RR)represents an advanced technology for converting CO2into highly valuable chemicals.Although significant progress has been achieved in producing multi-carbon chemic... Electrocatalytic CO2reduction reaction(CO2RR)represents an advanced technology for converting CO2into highly valuable chemicals.Although significant progress has been achieved in producing multi-carbon chemicals such as ethylene(C2H4),addressing(bi)carbonate salt formation and precipitation in alkaline electrolytes remains a critical challenge for achieving longterm stability during industrialization.We developed a Cu2(OH)2CO3/Mg2+/C pre-catalyst,which transforms into a catalytically active Cu0/Cu2+/Mg2+composite by electroreduction.Crucially,the application of different ionomers(specifically Sustainion XA-9)on this composite catalyst effectively alleviates salt precipitation issues,thereby enabling high-selectivity,durable CO2-to-C2+conversion.In a membrane electrode assembly,the maximum Faradaic efficiency for C2+products reaches 80%,with stable operation at 200 mA cm−2for 50 h.In situ Raman spectroscopy reveals that only top-type*CO intermediate exists on the Cu0/Cu2+/Nafion cathode,whereas both bridge-type and top-type of*CO sites coexist on the Cu0/Cu2+/Mg2+/Sustainion XA-9 cathode.This dual adsorption configuration facilitates the C─C coupling kinetics on the catalyst,inducing a favorable microenvironment for selective C2+formation.Therefore,strategic optimization of catalyst architectures and ionomer engineering enables CO2RR with improved efficiency and durability,advancing green chemistry and carbon-neutral technologies. 展开更多
关键词 electrocatalytic CO2reduction reaction ionomer MEA microenvironment
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Phosphonated ionomer modulates electrochemical interfaces in high temperature polymer electrolyte membrane fuel cells 认领 引用
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作者 Yangyang Hu Zhangxun Xia +3 位作者 Congrong Yang Jicai Huang Suli Wang Gongquan Sun 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第4期850-857,共8页
Liquid phosphoric acid(PA),as the proton carrier for high temperature polymer electrolyte membrane fuel cells(HT-PEMFCs),presents challenges such as catalyst poisoning,high gas transport resistance and electrolyte los... Liquid phosphoric acid(PA),as the proton carrier for high temperature polymer electrolyte membrane fuel cells(HT-PEMFCs),presents challenges such as catalyst poisoning,high gas transport resistance and electrolyte loss.These issues significantly impede the performance and durability of HT-PEMFCs,thereby limiting their potential for further application.In this study,poly(2,3,5,6-tetrafluorostylene-4-phosphonic acid)(PWN)with intrinsic proton conduction ability was employed as catalyst layer binder to reveal the impacts of the ionomer's molecular structure on mass transport within the catalyst layer.Our findings demonstrated that increasing the phosphorylation degree of PWN could enhance both pore formation at the catalyst layer and electrode acidophilic capability while improving proton conduction ability and reducing cells'internal resistance.However,adverse effects included increased local oxygen transport resistance and decreased catalyst utilization resulting from electrode acidophilic capability.This research offers valuable insights for the relationships between micro-scale molecule structure,mesoscale electrode architecture,and membrane electrode assembly design in HT-PEMFCs. 展开更多
关键词 High temperature polymer electrolyte membrane fuel cells Phosphonated ionomers Oxygen transport resistance Electrochemical interface Porous electrode
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Toughening Poly(lactic acid) with Imidazolium-based Elastomeric Ionomers 认领 引用 被引量：10
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作者 Lu Chen Kuan Hu +5 位作者 Si-Ting Sun Hai Jiang Dong Huang Kun-Yu Zhang Li Pan Yue-Sheng Li 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2018年第12期1342-1352,共11页
Imidazolium-based elastomeric ionomers （i-BIIR） were facilely synthesized by ionically modified brominated poly（isobutylene-co-isoprene） （BIIR） with different alkyl chain imidazole and thoroughly explored as nov... Imidazolium-based elastomeric ionomers （i-BIIR） were facilely synthesized by ionically modified brominated poly（isobutylene-co-isoprene） （BIIR） with different alkyl chain imidazole and thoroughly explored as novel toughening agents for poly（lactic acid） （PLA）. The miscibility, thermal behavior, phase morphology and mechanical property of ionomers and blends were investigated through dynamic mechanical analyses （DMA）, differential scanning calorimetry （DSC）, scanning electron microscopy （SEM）, tensile and impact testing. DMA and SEM results showed that better compatibility between the PLA and i-BIIR was achieved compared to the PLA/unmodified BIIR elastomer. A remarkable improvement in ductility with an optimum elongation at break up to 235% was achieved for the PLA/i-BIIR blends with 1-dodecylimidazole alkyl chain （i-BIIR-12）, more than 10 times higher than that of pure PLA. The impact strengths of PLA were enhanced from 1.9 kJ/m2 to 4.1 k J/m2 for the PLA/10 wt% i-BIIR-12 blend. Toughening mechanism had been established by systematical analysis of the compatibility, intermolecular interaction and phase structures of the blends. Interracial cavitations initiated massive shear yielding of the PLA matrix owing to a suitable interfacial adhesion which played a key role in the enormous toughening effect in these blends. We believed that introducing imidazolium group into the BIIR elastomer was vital for the formation of a suitable interfacial adhesion. 展开更多
关键词 Imidazolium-based ionomer Poly（lactic acid） Brominated poly（isobutylene-co-isoprene） Toughening Blend
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STUDY ON LIGHTLY SULFONATED SYNDIOTACTIC POLYSTYRENE IONOMERS 认领 引用 被引量：3
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作者 Jin Wang Fang-ming Zhu +2 位作者 Jin-cheng Lui Hua-ming Li Shang-an Lin 《Chinese Journal of Polymer Science》 SCIE EI CAS 2001年第3期269-276,共8页
Sulfonated syndiotactic polystyrene ionomers(SsPS)with 1.8 mol%degree of sulfonation have been studied.WAXD shows that the crystallinity of SsPS ionomers was decreased with increasing diameter size of the counter ions... Sulfonated syndiotactic polystyrene ionomers(SsPS)with 1.8 mol%degree of sulfonation have been studied.WAXD shows that the crystallinity of SsPS ionomers was decreased with increasing diameter size of the counter ions and sPS>SsPS-H>SsPS-K>SsPS-Zn.Moreover,SsPS ionomers only have alpha crystal form,while original sPS has two crystal forms:alpha and beta crystal form.TGA shows that the thermal stability of SsPS ionomers is higher than that of the original sPS and SsPS-Zn>SsPS-K>SsPS-H.DSC shows that all the glass transition temperatures(T-g)of SsPS ionomers are higher than that of the neat sPS and SsPS-Zn>SsPS-Na>SsPS-K>SsPS-H.However,the melting temperature(T-m)and crystallization peak temperature(T-p)of SsPS ionomers are lower and SsPS-H>SsPS-Zn>SsPS-K>SsPS-Na,while the crystallinity(X-c)of SsPS-Zn is the lowest.Nonisothermal crystallization kinetics shows that the Avrami index of sPS and SsPS-H are both about 4,suggesting the nucleation growth of SsPS-H with lower degree of sulfonation still keeps its three-dimension form.FTIR spectra of SsPS ionomers show a splitting absorption band for asymmetric stretching vibration of sulfonation group.The CH in-plane bending vibration of benzene ring shifted to higher wavenumber and the symmetric stretching vibration of sulfonation group changed slightly with different counter ion neutralized SsPS ionomers. 展开更多
关键词 sulfonated syndiotactic polystyrene ionomer sulfonation thermal behavior
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NOVEL SULPHONATED POLYSILOXANE POLYUREA-URETHANE IONOMERS 认领 引用 被引量：5
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作者 陈雷 余学海 杨昌正 《Chinese Journal of Polymer Science》 SCIE EI CAS 1996年第4期295-303,共9页
A series of novel polysiloxane polyurea-urethane blockcopolymers based on methylene bis(p-phenylisocyanate (MDI), sodium-s-1,2-dihydroxy propyl sulphonate (SDPS) and aminopropyl-terminated polydimethylsiloxane (ATPS) ... A series of novel polysiloxane polyurea-urethane blockcopolymers based on methylene bis(p-phenylisocyanate (MDI), sodium-s-1,2-dihydroxy propyl sulphonate (SDPS) and aminopropyl-terminated polydimethylsiloxane (ATPS) was synthesized with varying length of soft segments and neutralizing cation. The effect of the chemical composition and the cation on the morphology and mechanical properties of the samples were studied. It was found that the SDPS chain extender based samples have definite chemical structure (-MDI-SDPS-MDI-ATPS-). As the length of the soft segment increases, an improvement of phase separation was observed. In addition, when SO3Na was translated into SO3H or the sulphonic acid groups were neutralized with different charge cations (Na+, Zn2+ and Al3+), the morphology and mechanical properties changed greatly. 展开更多
关键词 Polysiloxane Polyurea Polyurethane Ionomers
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Development and Challenges of Electrode Ionomers Used in the Catalyst Layer of Proton-Exchange Membrane Fuel Cells:A Review 认领 引用 被引量：3
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作者 Qingnuan Zhang Bo Wang 《Transactions of Tianjin University》 EI CAS 2023年第5期360-386,共27页
The electrode ionomer plays a crucial role in the catalyst layer(CL) of a proton-exchange membrane fuel cell(PEMFC) and is closely associated with the proton conduction and gas transport properties,structural stabilit... The electrode ionomer plays a crucial role in the catalyst layer(CL) of a proton-exchange membrane fuel cell(PEMFC) and is closely associated with the proton conduction and gas transport properties,structural stability,and water management capability.In this review,we discuss the CL structural characteristics and highlight the latest advancements in ionomer material research.Additionally,we comprehensively introduce the design concepts and exceptional performances of porous electrode ionomers,elaborate on their structural properties and functions within the fuel cell CL,and investigate their effect on the CL microstructure and performance.Finally,we present a prospective evaluation of the developments in the electrode ionomer for fabricating CL,offering valuable insights for designing and synthesizing more efficient electrode ionomer materials.By addressing these facets,this review contributes to a comprehensive understanding of the role and potential of electrode ionomers for enhancing PEMFC performance. 展开更多
关键词 Electrode ionomer Proton conduction Oxygen transport resistance Catalyst layer Proton-exchange membrane fuel cell
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Setting kinetics and mechanical properties of flax fibre reinforced glass ionomer restorative materials 认领 引用 被引量：3
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作者 Ensanya Ali Abou Neel Anne M.Young 《Journal of Biomedical Research》 CAS CSCD 2017年第3期264-272,共9页
Regardless of the excellent properties of glass ionomer cements,their poor mechanical properties limit their applications to non-load bearing areas.This study aimed to investigate the effect of incorporated short,chop... Regardless of the excellent properties of glass ionomer cements,their poor mechanical properties limit their applications to non-load bearing areas.This study aimed to investigate the effect of incorporated short,chopped and randomly distributed flax fibers（0,0.5,1,2.5,5 and 25 wt%） on setting reaction kinetics,and mechanical and morphological properties of glass ionomer cements.Addition of flax fibers did not significantly affect the setting reaction extent.According to their content,flax fibers increased the compressive（from 148 to 250 MPa） and flexure strength（from 20 to 42 MPa）.They also changed the brittle behavior of glass ionomer cements to a plastic one.They significantly reduced the compressive（from 3 to 1.3 GPa） and flexure modulus（from 19 to 14 GPa）.Accordingly,flax fiber-modified glass ionomer cements could be potentially used in high-stress bearing areas. 展开更多
关键词 setting kinetics flax fibre glass ionomer cements
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Influence of Aging and 2-hydroxyethyl-methacrylate Content on the Color Stability of Experimental 2-hydroxyethyl-methacrylate-added Dental Glass Ionomers 认领 引用 被引量：1
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作者 Bin Yu Guangfeng Zhao +2 位作者 Honam Lim Jinik Lira Yongkeun Lee 《Journal of Materials Science & Technology》 SCIE EI CAS 2010年第4期379-384,共6页
Color stability of dental resin modified glass ionomer （RMGI） has been a challenge to dentistry; therefore, systematic changes in 2-hydroxyethyl methacrylate （HEMA） content were performed experimentally to find an... Color stability of dental resin modified glass ionomer （RMGI） has been a challenge to dentistry; therefore, systematic changes in 2-hydroxyethyl methacrylate （HEMA） content were performed experimentally to find an idea to enhance the color stability. Changes in color （△E＊ab） and color coordinates （△L＊, △a＊ and △b＊） of experimental 10-50 wt pct HEMA-added dental glass ionomers （HAGIs） and corresponding RMGIs were determined after 5000 cycles of thermocycling. Color changes of HAGIs were not influenced by the HEMA content while △L＊, △a＊ and △b＊ values were influenced by the HEMA content. Color stability of 30% or 40% HEMA-added HAGIs was not different from those of the commercial RMGIs. Since the influence of HEMA itself on the color stability of HAGIs was limited, compositional modification to increase the color stability of these materials should be developed. 展开更多
关键词 Glass ionomer 2-hydroxyethyl methacrylate （HEMA） Color coordinate Thermocycling
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Modification of Interfacial Interaction of PBT/PP Blends by Adding Main-chain Liquid Crystalline Ionomer with Sulfonic Group 认领 引用 被引量：1
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作者 XU Xin-yu ZHANG Fan XIE Bing-xi 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第2期340-344,共5页
A main-chain liquid crystalline ionomer（MLCI） containing sulfonic group was synthesized by an interfacial condensation reaction.The MLCI was blended with polybutylene terephthalate（PBT） and polypropylene（PP）.MLC... A main-chain liquid crystalline ionomer（MLCI） containing sulfonic group was synthesized by an interfacial condensation reaction.The MLCI was blended with polybutylene terephthalate（PBT） and polypropylene（PP）.MLCI interacted with both the dispersed（PP） phase and the matrix（PBT） phase to modify the interfacial interaction of PBT and PP.Differential scanning calorimetry（DSC）,scanning electron microscopy（SEM） and FTIR imaging system analysis demonstrated the significance of interfacial interaction in the polymer blends.MLCI brought about good adhesion at the interfacial,which reduced the disperse phase size and enabled a fine PP phase at matrix.The mechanical properties of the ternary blends were improved when a proper amount of MLCI was added.This was attributed to enhanced adhesion at the interface,which invoked better mechanical properties in the blends. 展开更多
关键词 Poly（butylent terephthalat） Polypropylene Main-chain liquid crystalline ionomer Sulfonic group Interfacial interaction
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INFLUENCE OF ZnSt_2 ON STRUCTURE OF ACRYLATE-BASED IONOMERS WITH DIFFERENT LANTHANIDE(La(Ⅲ))ION AND ACID CONTENTS 认领 引用 被引量：1
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作者 Xiao-nan Zhu Yi-hu Song Qiang Zheng 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2012年第2期316-327,共12页
A series of acrylate processing aid(ACR)-based ionomers with different lanthanide(La(III))ion and acid contents were synthesized,and the interaction between ionomer and zinc stearate(ZnSt2)was investigated immediately... A series of acrylate processing aid(ACR)-based ionomers with different lanthanide(La(III))ion and acid contents were synthesized,and the interaction between ionomer and zinc stearate(ZnSt2)was investigated immediately after thermally annealing the ionomer/ZnSt2(3/1 in weight)mixtures at 180℃.The results revealed that the ion groups in ionomer have a strong interaction with ZnSt2.The annealed mixtures contained hot alcohol extractable and unextractable ZnSt2.The melting of ZnSt2 and the thermal behavior of the ionomer in the annealed mixtures were seriously influenced by the contents of La(III)and acid in the ionomers.The ionomer containing 0.25 rnmol/g acid and 0.37 mmol/g La(III)has a detectable cluster phase.Annealing its ZnSt2 mixture could break down the cluster phase and lower glass transition temperature of the ionomer matrix.However,washing away the extractable ZnSt2 led to the reappearance of the cluster transition temperature and return of the glass transition temperature of matrix to the original position. 展开更多
关键词 Ionomer ZnSt2 Annealing
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COMPATIBILITY OF POLY (STYRENE-B-2-VINYL PYRIDINE)/IONOMER BLENDS BASED ON ION-LIGAND INTERACTION 认领 引用 被引量：1
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作者 GUO Tianying HAO Guangjie +1 位作者 SONG Moudao ZHANG Banghua 《Chinese Journal of Reactive Polymers》 2002年第1期26-31,共6页
In this work, DSC and SEM studies indicate that ion-ligand interaction can be utilized to enhance the interaction of poly (styrene-block-2-vinyl pyridine)[P (S-b-2VP)] and polyethylene based ionomer (Surlyn). The comp... In this work, DSC and SEM studies indicate that ion-ligand interaction can be utilized to enhance the interaction of poly (styrene-block-2-vinyl pyridine)[P (S-b-2VP)] and polyethylene based ionomer (Surlyn). The compatibility for this blending system can be improved by this special interaction and 20/80 wt is the optimum blending composition with good compatibility. FTIR results further certify that strong interactions exist in the blending system. 展开更多
关键词 Diblock copolymer Ionomer Blending Compatibility
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Bipolar ionomer electrolytes with desirable self-discharge suppression for supercapacitors 认领 引用
19
作者 Wenqiang Wang Qingyun Zeng +2 位作者 Ruoyu Wang Gengchao Wang Chunzhong Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第3期422-429,I0012,共8页
Supercapacitors based on electric double layers are prone to serious self-discharge due to electrolyte ion desorption and the resulting energy loss severely limits the application range of supercapacitors.Rational des... Supercapacitors based on electric double layers are prone to serious self-discharge due to electrolyte ion desorption and the resulting energy loss severely limits the application range of supercapacitors.Rational design of polymer electrolyte systems to address this problem shows considerable generality and high feasibility.Herein,we reported a quasi-solid-state bipolar ionomer electrolyte prepared by an in-situ layer-by-layer ultraviolet-curing method,which has an integrated Janus structure with an intermediate binding layer.Based on the synergistic effect of confining impurity ions by ionizable groups and electrostatic repulsion to stabilize the electric double layers and superimposing synergies on both sides,the assembled device not only possesses ideal supercapacitor characteristics,but also exhibits an ultrahigh voltage retention of 71% after being left to stand for 100 h after being fully charged.Furthermore,through the quasi-in-situ energy dispersive X-ray spectroscopy linear scanning,the characteristics of ion diffusion in this ionomer electrolyte are revealed,suggesting its correlation with self-discharge behavior. 展开更多
关键词 Bipolar membrane Ionomer electrolyte Supercapacitors Self-discharge
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SYNTHESES AND ANTIMICROBIAL ACTIVITY OF NOVEL POLYURETHANE IONOMERS 认领 引用
20
作者 陈雷 马文漪 +1 位作者 余学海 杨昌正 《Chinese Journal of Polymer Science》 SCIE EI CAS 1996年第3期205-210,共6页
This study is concerned with the removal of Staph aureus from water by polyurethaneionomers. All the samples are quaternary ammonium salts which possess a positive chargeon the surface. The ratio of the soft segment t... This study is concerned with the removal of Staph aureus from water by polyurethaneionomers. All the samples are quaternary ammonium salts which possess a positive chargeon the surface. The ratio of the soft segment to diisocyanate and chain extender is 1:2:1and the ionization degree is 100%. The ionomers strongly capture microbial cells on theirsurfaces in a living state and the hydrophilicity of polymer matrix used in the studyenhanced the affinity of the polymer for bacterial cells. The adhesion of the microorganismto polymer was due mainly to electrostatic interaction between them. The calculation ofthe viable cell count showed that D value for Staph.aureus is not proportional to the nitro-gen concentration. The microorganism capture ability of pyridinium-containing polymer isgreater than that of piperazine based samples. 展开更多
关键词 PTMG In SYNTHESES AND ANTIMICROBIAL ACTIVITY OF NOVEL POLYURETHANE IONOMERS PEG
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