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首页> 外文期刊>Macromolecules >THERMOREVERSIBLE GELS OF POLYANILINE - VISCOELASTIC AND ELECTRICAL EVIDENCE ON FUSIBLE NETWORK STRUCTURES
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THERMOREVERSIBLE GELS OF POLYANILINE - VISCOELASTIC AND ELECTRICAL EVIDENCE ON FUSIBLE NETWORK STRUCTURES

机译：聚苯胺的热可逆性-粘性网络结构的粘弹性和电证据。

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摘要

We demonstrate thermoreversible gelation of a conductive polymer, i.e., rubber-like melt processible electrically conducting compounds. Combination of viscoelastic and electrical conductivity measurements suggests network formation in the gel state and gel melting at elevated temperatures. The gels have been prepared by dissolving polyaniline in dodecylbenzenesulfonic acid (DBSA) using formic acid as a processing medium which mas removed at the end. Importantly, without formic acid, reversible gelation and particle-free materials mere not achieved even at the resolution of optical microscopy. For T < T-gel the materials behave elastically in compression experiments, the storage and loss moduli do not depend much on frequency, and the electrical conductivity is primarily electronic, probably due to high chain-to-chain hopping conductivity. For T > T-gel the onset of liquid-like flow is detected using modified ball drop method by dynamic mechanical analysis, the dynamic moduli become strongly frequency dependent, and the electrical conductivity drops orders of magnitude to the value corresponding to the ionic conductivity of DBSA, suggesting that the chains are not in direct contact. The physical crosslinks are probably localized mesomorphic domains which allow melting. [References: 53]
机译：我们证明了导电聚合物即橡胶状可熔融加工的导电化合物的热可逆凝胶化。粘弹性和电导率测量的组合表明，在凝胶状态下网络形成，而在高温下凝胶熔化。通过使用甲酸作为处理介质将聚苯胺溶解在十二烷基苯磺酸（DBSA）中来制备凝胶，最后将其去除。重要的是，如果没有甲酸，即使在光学显微镜分辨率下也无法实现可逆的凝胶化和无颗粒材料。对于T T-gel，使用改进的落球法通过动态力学分析检测到液体状流动的开始，动态模量与频率密切相关，并且电导率下降了几个数量级，降至与离子电导率相对应的值。 DBSA，建议各链条不要直接接触。物理交联可能是允许熔化的局部介晶域。 [参考：53]

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