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首页> 美国卫生研究院文献>Polymers >Influence of Acidity and Oxidant Concentration on the Nanostructures and Electrochemical Performance of Polyaniline during Fast Microwave-Assisted Chemical Polymerization
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Influence of Acidity and Oxidant Concentration on the Nanostructures and Electrochemical Performance of Polyaniline during Fast Microwave-Assisted Chemical Polymerization

机译：酸和氧化剂浓度对快速微波辅助化学聚合过程中聚苯胺纳米结构和电化学性能的影响

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摘要

Polyaniline (PANI), a typical conducting polymer, has attracted great interest as an electrode material. A series of PANIs were prepared through fast microwave-assisted chemical oxidative polymerization with varying HCl and APS concentrations here. It was found that the microwave synthesized PANIs had ~4 times higher for the yields and 7~10 times higher for the electrical conductivity in comparison to PANI samples prepared using conventional method. PANI nanosheets could easily be fabricated in weakly acidic solution due to their oligomeric structure, which contained flat phenazine rings. By contrast, linear PANI chains produced in highly acidic solutions formed nanofibers. The APS concentration did not significantly affect the molecular structures of PANIs under the conditions here. However, increasing the concentration of APS produced nanofibers with shorter branches, which may be due to secondary nucleation during chain growth resulting from increases in active initiation centers. The electrical conductivity and electrochemical performance of PANIs were both improved with increasing HCl and APS concentrations. Improvements due to increases in HCl concentration may be attributed to additions in conjugation length and enrichment of doping levels, while improvements due to increases in APS concentration could be attributed to the increased crystallinity of PANI, which facilitates ion transport.
机译：聚苯胺（PANI），一种典型的导电聚合物，作为电极材料引起了极大的兴趣。通过快速微波辅助化学氧化聚合反应制备了一系列PANI，此处的HCl和APS浓度不同。已发现，与使用常规方法制备的PANI样品相比，微波合成的PANIs的产率高约4倍，电导率高7〜10倍。由于PANI纳米片的低聚结构（其中包含扁平的吩嗪环），因此很容易在弱酸性溶液中制备。相反，在高酸性溶液中产生的线性PANI链形成了纳米纤维。在此条件下，APS的浓度不会显着影响PANI的分子结构。但是，增加APS产生的具有较短分支的纳米纤维的浓度，这可能是由于在链增长过程中由于主动起始中心的增加而导致的二次成核。随着HCl和APS浓度的增加，PANI的电导率和电化学性能均得到改善。由于HCl浓度增加而引起的改善可能归因于共轭长度的增加和掺杂水平的增加，而由于APS浓度增加而引起的改善可能归因于PANI结晶度的提高，这有利于离子迁移。

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