聚苯胺在聚酰亚胺膜基体表面的原位沉积成膜机理

采用分散聚合方法,在聚酰亚胺(PI)膜基体表面原位成膜,制备聚苯胺-聚酰亚胺-聚苯胺(PANI-PI-PANI)导电复合膜.通过反应历程跟踪、扫描电镜(SEM)及静滴接触角-界面张力测量仪研究了PANI在PI基体表面原位成膜的过程及其驱动力.结果表明,PANI在PI基体表面的成膜过程有3个阶段:含苯胺的结构单元(包括An盐酸盐、An阳离子自由基及低聚物)在PI表面吸附成核阶段、膜快速增长阶段和增长完成阶段;PANI膜由PANI小颗粒逐渐堆积而成,直至覆盖整个PI膜表面;PANI成膜的主要驱动力来自亲水-疏水相互作用.

Mechanism of PANI Film Prepared by in-situ Deposition on PI Film Matrix Surface

Polyaniline-polyimide-polyaniline(PANI-PI-PANI)compound film was prepared through an in-situ growth on PI film matrix in dispersion polymerization.The processing and driving force of PANI film deposited on PI matrix were studied by processing tracing of reaction,SEM and static drop contact angle-interfacial tension tester.Results show that the process of PANI film deposited on PI matrix takes on three obvious stages.First,constitutional units containing aniline segment,such as An hydrochloride,An cation free radical,and oligomer,are adsorbed onto PI matrix and nucleates.Second,film quickly grows.Third,growth completes.PANI film is formed with a gradual accumulation of small grains of polyaniline,until the entire surface of PI film is covered.The main driving force of PANI film is the hydrophilic-hydrophobic interaction.