JOURNAL OF APPLIED POLYMER SCIENCE
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2012
·Vol. 126
·期 3
·980-986
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IF 1.289
Xiaonan Zhu,Yihu Song,Qiang Zheng
A type of lanthanide (La(III))-containing ionomer based on acrylate processing aid (ACR) for poly (vinyl chloride) (PVC) was synthesized, and influence of the ionomer on thermal stabilization of PVC was investigated with visual color comparison and Congo red methods. Results revealed that the ionomer with a suitable La(III) content behaved as a good costabilizer to PVC. It was able to extend static stabilization time of PVC and postpone “zinc burning.” The stabilizing efficiency of the ionomer to PVC depended on ion content, which was discussed in terms of Eisenberg–Hird–Moore model. Moreover, Fourier transform infrared test verified that this ionomer can react with zinc stearate (ZnSt 2 ) to form some new structures, which is responsible for postponing “zinc burning.” The ionomer and epoxidized soybean oil exhibited a synergistic effect on the stabilizing efficiency of calcium stearate (CaSt 2 )/ZnSt 2 stabilizer to PVC compounds. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Xiling Niu,Fenfen Wang,Xiaohui Li,Rongchun Zhang,Qiang Wu,Pingchuan Sun
Vitrimers are fascinating thermoset polymers to the industry since they can be recycled and reprocessed without compromising their mechanical strength and solvent resistance. Particularly, transesterification reaction in the epoxy resin (ER) vitrimers usually requires the incorporation of a catalyst, whereas most reports only focused on investigating the catalytic effect of small molecules, such as zinc acetate (Zn(OAc)2) and triazabicyclodecene (TBD). In this work, a polymer catalyst, poly(acrylonitrile-co-zinc methacrylate) (Zn-PAM), was synthesized by the random copolymerization of zinc methacrylate and acrylonitrile, where the transesterification catalysis efficiency of Zn-PAM was systematically investigated and compared to that of Zn(OAc)2 and TBD by temperature-dependent stress relaxation experiments. It was revealed that Zn-PAM has a higher catalysis efficiency than Zn(OAc)2 and TBD under the same loading between Zn2+ and TBD. Besides, only a tiny amount of polymer catalyst is needed to efficiently catalyze the transesterification reaction while in the meantime enhance the mechanical properties of ER.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 4.1
Liu Fan,Huang Shao-Yong,Tang Jian,Chen Quan
In this study, we prepared unentangled and slightly entangled poly( L -lactic acid) telechelic ionomer samples ( M n =5 and 16 kg/mol) based on sodium sulfonate groups. The telechelic samples exhibit extremely slow crystallization kinetics below the melting temperature T m and above the glass transition temperature T g , which enables us to examine the linear viscoelasticity of the ionomer melt samples therein. The application of either the shear flow (at 85 °C) or elongational flow (between 70 and 90 °C) strongly accelerates the crystallization, leading to strong strain hardening and formation of highly oriented α crystals. Depending on the relative average rates of the strain-induced dissociation and strain-induced crystallization, the stress evolution can be classified into two cases, and the critical work for strain-induced crystallization is higher in case where the strain-induced dissociation occurs earlier than the strain-induced crystallization.
研究领域:
高分子化学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 39
·15189-15196
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IF 8.262
Chaolumen Wu,Chenbo Liao,Taoran Li,Yanqiong Shi,Jiangshui Luo,Lei Li,Jun Yang
A polymer lithium–oxygen battery based on lithiated perfluorinated sulfonic conducting ionomers swollen with non-aqueous solvents used as both the electrolyte and separator is successfully operated at room temperature, and shows good cycling stability and rate capability and is even operable for many cycles with a capacity as high as 1500 mA h gcarbon−1. It demonstrates the suitability of the polymer lithium–oxygen battery as a high-energy storage system.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Siqi Fang,Guoliang Liu,Minghai Li,Haining Zhang,Jun Yu,Fangfang Zhang,Mu Pan,Haolin Tang
Reducing the local oxygen transport resistance in the cathode catalyst layer of the proton exchange membrane fuel cell (PEMFC) is crucial for the improvement of cell performance, particularly for low platinum loading. In this work, we report that the performance of PEMFC can be significantly improved by replacing Nafion with a highly oxygen-permeable perfluoronated ionomer containing dioxole segments on the backbone as both proton conductor and catalyst binder in the cathode catalyst layer, as evidenced by the increased peak power density of 100 mW cm–2. Molecular dynamics simulation results reveal that the synthesized ionomer has higher diffusion coefficient and higher oxygen solubility compared with Nafion. Benefiting from the high oxygen permeability, both the specific activity and mass specific activity of a Pt/C catalyst using the designed ionomer as catalyst binder for the oxygen reduction reaction are three times higher than those of a catalyst using Nafion as catalyst binder. The results demonstrate that the rational design of highly oxygen-permeable ionomers applied in the catalyst layer could be an effective strategy for a high-performance PEMFC with low platinum loading.
研究领域:
能源科学
·
材料化学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2021
·
IF 9.501
Hengxin Xie,Jiancong Pan,Biaowen Wei,Jun Feng,Shijun Liao,Xiuhua Li,Yigang Yu
We developed a series of anti-fouling anion exchange membranes (AEMs) by in-situ interpenetration of an ionomer of N -methylimidazole ionizing poly(2,6-dimethyl-1,4-phenylene oxide) (IM-QPPO) to lateralized gradient cross-linked hydrogel of Ca-Na alginate (CA). The CA surfaces repel negative-charged organic pollutants because of their inherent hydrophilicity and electronegative property. SEM and EDX characterizations reveal that the micron-sized anti-fouling CA layers are bonded firmly with the ionomer bulk by the interpenetration. The anti-fouling AEMs have qualified basic properties of thermal stability, water uptake and swelling ratio, area resistance and permselectivity for electrodialysis (ED) processes. IM-QPPO-0.10CA with optimal interpenetrating structure exhibits the highest current efficiency (η) of 88.88% and the lowest energy consumption (EC) of 2.53 kWh kg −1 NaCl among the group, which are comparable to those of commercial AMX (η = 89.38%, EC = 2.20 kWh kg −1 NaCl). IM-QPPO-0.10CA shows the strongest anti-fouling ability, which is confirmed by the lowest ascent speed of transmembrane voltage and no irreversible membrane-structure damages during the fouling tests. Moreover, the fouled IM-QPPO-0.10CA recovers 99.60% of the origin η value with an EC increase of 0.10 kWh kg −1 NaCl after immersion in NaCl solution. The properties of IM-QPPO-0.10CA are promising for the application of anti-fouling ED AEMs.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Henghui Huang,Qi Yao,Xiuping Zhang,Haijiang Wang
Introducing hydrophilic groups and increasing the compatibility of the ionomer and reinforcement layer can have a significant impact on the proton conductivity and cell performance of a proton exchange membrane (PEM) under lower relative humidity (RH). In this work, a novel PEM containing expanded polytetrafluoroethylene (ePTFE) functionalized with amino and hydroxyl groups is designed and fabricated to enhance the PEM's proton conductivity and electrochemical performance at low RH, and to improve its mechanical stability. The introduction of the hydrophilic groups and the generation of stable acid–base pairs yield a PFSA ionomer that has better compatibility with and adhesion to the hydrophilic functionalized ePTFE membrane, thereby significantly improving the prepared membrane's proton conductivity, H 2 crossover current density, and single-cell performance. In addition, generated water is retained inside the PEM, keeping its cell performance high at low RH. The PEM's mechanical durability is also improved by the increased dimensional stability and compatibility of the ionomer and reinforcement layer. This work provides a promising way to improve the proton conductivity and cell performance of PEMs at low RH and has great application potential for creating PEM fuel cells with high mechanical durability.
研究领域:
材料科学
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能源工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 5
·1182
·
IF 5
Qi Wang,Yutao Li,Jianbin Xiao,Lin Xia
IntelligentEucommia ulmoidesrubber (EUR) and ionomer Surlyn resin (SR) blends were prepared and studied in this manuscript. This is the first paper to combine EUR with SR to prepare blends with both the shape memory effect and self-healing capability. The mechanical, curing, thermal, shape memory and self-healing properties were studied by a universal testing machine, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA), respectively. Experimental results showed that the increase in ionomer content not only improved mechanical and shape memory properties but also endowed the compounds with excellent self-healing ability under the appropriate environmental conditions. Notably, the self-healing efficiency of the composites reached 87.41%, which is much higher than the efficiency of other covalent cross-linking composites. Therefore, these novel shape memory and self-healing blends can expand the use of naturalEucommia ulmoidesrubber, such as in special medical devices, sensors and actuators.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
PubMed
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Mengen Zhang,Ruijia Wang,Tinghao Jia,Congjing Ren,Jingdai Wang,Yongrong Yang,Yao Yang
A molecular-level understanding of the ion cluster morphology is crucial to designing the structure and enhancing the properties of random polyethylene ionomer. Here, we report that the strategic addition of aliphatic disodium salt has a pronounced effect on the mechanical properties and nanoscale morphology. With the addition of various aliphatic disodium salts, both the tensile strength and Young’s modulus are significantly increased. By comparing the results of atomistic molecular dynamics simulations with experimental characterization data, the ionic cluster nanoscale morphology varies with different chain-length disodium salts, while maintaining the crystallization of the polyethylene matrix. The alkyl disodium salts with relatively short alkyl chains (C12) bridge between clusters by anchoring to two different clusters, helping to redistribute the clusters within the polymer matrix and providing additional cross-link strength. The cluster morphological evolution during stretching was simulated, and its relation to mechanical properties is comprehensively discussed. This, in turn, unlocks the potential for structural regulation at the nanoscale by additive manufacturing to enhance the performance.
研究领域:
材料科学
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高分子化学
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计算化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 33
·17542-17549
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IF 11.9
Chenyang Zheng,Di Xiao,Junfeng Zhang,Yabiao Pei,Lianqin Wang,Xin Liu,Yan Yin,Michael D. Guiver,Xianguo Li
The design of robust catalyst layers (CLs) applicable under realistic conditions is an essential concern for anion exchange membrane fuel cells (AEMFCs). Ionomers act as “transport bridges” for electrochemical reactions involving water, gas, and ions within CLs, and play a crucial role in CL stability and performance. Here, quaternary ammonium polymers with meta- or para-terphenyl were compared as anion exchange ionomers (AEIs), to study the relationship between AEI molecular conformation and CL parameters under dynamic operating conditions. The meta-AEI exhibits a lower swelling ratio compared with the para-AEI, endowing the CL with high water retention ability, which remarkably enhances the CL stability under an accelerated stress test (AST). The power density attenuation of the membrane electrode assembly prepared with meta-AEI is only 49.5%, which is much lower than that based on para-AEI (69.5%) after 100 dry/wet N2 cycles. These insights lead to improvements in AEI design and consequently, the operational stability of AEMFCs.
研究领域:
材料科学
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电化学
·
燃料电池技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Wenshuo Wang,Pengju Pan,Yongzhong Bao
To meet improved requirements for proton-exchange membranes (PEMs) applied in medium- and low-temperature fuel cells, novel PEMs with superior performance are prepared by using commercial perfluorinated sulfonic-acid ionomer (PFSA) and a dopant, tetraphenylporphyrin tetrasulfonic-acid (TPPS). Different from physically blending PFSA with another polymer or a nano-material, the membrane-forming mechanism of TPPS modified PFSA PEMs is highly dependent on the efficient interaction between PFSA and TPPS molecules. The unique three-part nested hydrophilic-hydrophobic-hydrophilic molecular structure of TPPS plays a crucial role in the co-assembly of PFSA with TPPS. The more intensive ionic cross-linking and hydrogen-bond networks are formed through hydrophilic groups in the outer and internal parts of TPPS and sulfonic-acid groups of PFSA. Meanwhile, secondary cross-linking of these hydrophilic groups is induced by rigid hydrophobic groups in the middle part of TPPS. Therefore, these molecular interactions induce the formation of more stable and stronger nano-phase separation with more uniform size. This novel nano-phase separation structure endows PEMs with elevated applicable temperatures, much increased proton conductivity and thus superior fuel cell performances, which are the keys to the development of more advanced hydrogen fuel cells.
研究领域:
材料科学
·
燃料电池技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 25
·13355-13367
·
IF 14.511
Bowen Wang,Ji Pan,Xiuyang Zou,Junliang Zhao,Guodong Xu,Zhiyu Jin,Zhe Sun,Feng Yan
The ionomer binder is crucial for the preparation of homogeneous catalyst layers for anion exchange membrane fuel cells (AEMFCs). However, the dense stacking of the ionomer on the catalyst surface results in large resistance to gas (especially O2) penetration in the three-phase boundary (TPB). Here, an in situ UV-driven gas “expressway” for the catalyst layer of AEMFCs was prepared by a rigid anthracene-based cross-linkable ionomer. The gas permeability of the catalyst layer was increased by 130% after crosslinking due to the high free volume between the ionomer chain segments. Meanwhile, the electrochemical and identical location transmission electron microscopy (IL-TEM) characterizations showed that the crosslinked ionomer binders played an anchoring role for the catalyst particles. The performance of an H2/O2 AEMFC (based on commercialized FAA-3-50 membranes) containing the crosslinked ionomer is much better than that of the uncrosslinked PPOAN ionomer. The in situ UV-driven crosslinking strategy of catalyst layers provides new insights into the preparation of homogeneous mesoscopic structures for the catalyst particles. More importantly, the rigid anthracene-based crosslinked structure constructs microscopic gas channels in the ionomer–catalyst interface, which has been overlooked in previous work.
研究领域:
材料科学
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能源科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）