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首页> 外文期刊>Journal of Applied Polymer Science >Environmental stability of electrically conductive viologen-polyaniline systems
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Environmental stability of electrically conductive viologen-polyaniline systems

机译：导电紫精-聚苯胺体系的环境稳定性

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摘要

Viologen-polyaniline (PANI) systems were prepared by PANI being coated onto viologen-grafted low-density polyethylene films. PANI in this system could undergo photoinduced doping with ultraviolet irradiation. The electrical stability of the electrically conductive viologen-PANI systems was found to be stable in air, but the conductivity decreased rapidly when the sample was treated in aqueous media of pH > 5 because of the migration of the anions out of PANI into water. However, the conductivity increased by a factor of 2 after treatment in a 1M HCl solution because of the further protonation of PANI by acid. The structural changes of these systems were monitored with ultra violet-visible absorption spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and resistance measurements. The electrical stability of the viologen-PANI system in water could be enhanced via spin coating with poly(methyl methacrylate) (PMMA) because this layer inhibited the migration of the anions out of the system. The photoinduced doping of PANI could be carried out either before or after the spin coating of PMMA. The advantages and limitations of each method were demonstrated. A PMMA coating with a thickness of approximately 10 mum allowed a significant doping level to be achieved within a short period of irradiation and, at the same time, effectively shielded the film from the effects of the aqueous medium. (C) 2002 Wiley Periodicals, Inc. [References: 29]
机译：通过将PANI涂覆在紫罗兰接枝的低密度聚乙烯薄膜上来制备紫罗兰-聚苯胺（PANI）系统。该系统中的PANI可能会受到紫外线辐射的光诱导掺杂。发现导电的紫精-PANI系统的电稳定性在空气中稳定，但是当样品在pH> 5的水性介质中处理时，由于阴离子从PANI迁移到水中，电导率迅速下降。但是，在1M HCl溶液中处理后，电导率增加了2倍，这是因为PANI被酸进一步质子化了。这些系统的结构变化通过紫外可见吸收光谱，傅立叶变换红外光谱，X射线光电子能谱和电阻测量进行监测。通过用聚甲基丙烯酸甲酯（PMMA）旋涂可以增强紫精-PANI系统在水中的电稳定性，因为该层抑制了阴离子从系统中的迁移。可以在旋涂PMMA之前或之后进行PANI的光诱导掺杂。证明了每种方法的优点和局限性。厚度约为10微米的PMMA涂层允许在短时间的照射下达到显着的掺杂水平，同时有效地屏蔽了薄膜免受水性介质的影响。 （C）2002 Wiley Periodicals，Inc. [参考：29]

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