论文摘要
导电聚苯胺(Polyaniline,PANI)作为一种新型的功能高分子材料,越来越受到科学家们的关注。这不仅是因为它具有合成方法简单、掺杂机制独特、环境稳定性良好等优点,而且它还具有广阔的开发与应用前景。但是聚苯胺的难溶解、难熔融、不易加工等特性阻碍了聚苯胺的实用化进程。磁场效应对自由基类的高分子合成具有显著的影响。而磁流体的动力学效应会导致质量传递增强,影响聚合反应的速率及进程。同时,由于聚苯胺分子具有各向异性抗磁磁化率,可导致其内部结构单元在磁场作用下优先沿某一特定方向的生长排列,即发生一定程度的取向,使产物的分子链排列更加有序,结构更加规整,同时表现为材料在物理性能方面的各向异性。磁场可通过影响PANI的微观结构,如共轭链长、分子链规整度、聚集态等,进而对的其宏观性能构成影响,比如:会使PANI的电导率、溶解/分散性、热解温度等产生不同程度的提高。本文在(0.4T)磁场环境和无磁场环境下(其它实验条件相同),采用乳液聚合法制备了PANI,并通过透射电镜、原子力显微镜、渗透凝胶色谱、傅立叶红外光谱、X-射线衍射、四探针电导率、激光粒度分析、热失重分析、塔菲尔曲线、产物复合膜电阻率的各向异性,以及产物间甲酚溶液的电导率在外电场作用下变化的分析与表征,对比研究了磁场作用对苯胺乳液聚合行为、产物取向结构及性能的影响机制,并通过创新的方法成功地对PANI的取向结构行进了表征。研究结果表明:与无磁场作用下苯胺的乳液聚合相比,磁场作用下苯胺乳液聚合的反应速率加快、产率增加,所得产物的分子量、电导率、溶解/分散性、防腐性、热稳定性及结晶性等也均有提高;磁场作用对乳液聚合法制备PANI的基本单元结构无明显影响,但由于磁场作用下制备的PANI具有更显著的抗磁磁化率的各向异性,即不同方向上粒子对磁场的响应特性发生了明显的分化,极大的增强了微粒间聚集时的取向排列,因此与无磁场作用下制备PANI相比,磁场作用下制备的PANI具有明显的微观取向结构,其微粒有序排列和堆砌成了许多具有一定长/径比的条状聚集体,且在外磁场作用下这种微观的取向排列方式会进一步演变成宏观的取向,随之表现出物理性能上的各向异性。当乳化剂与苯胺摩尔比为0.5,氧化剂与苯胺摩尔比为0.8,pH值为2.53,反应时间为4h时,磁场作用对苯胺乳液聚合行为及产物结构、性能的影响显著,(0.4T)磁场环境下制备PANI的取向程度较高,各主要结构、性能指标较优,且普遍比无磁场环境下制备PANI的好。
论文目录
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