丙酮/水混合体系合成聚苯胺的聚合过程研究

Study on the Polymerization Process of Polyaniline in Acetone/Water System

对丙酮/水体系中合成聚苯胺(PAn)的反应进行跟踪,通过聚合过程的开路电压、聚合温度、特性粘度和中间体的分子结构对聚合过程进行研究。结果表明,丙酮/水体系对控制产物的粒度和分子量都有利;当丙酮/水的体积比为0.2左右时,所得产物的各项性能较好。与水体系相比,在丙酮/水混合体系中聚合过程维持高电位的时间延长,聚合链增长时间和自加速反应时间也有延长。苯胺聚合是以头-尾连接形式进行,且中间产物由高氧化态逐渐转变成中间氧化态。

Polymerization process of polyaniline（ PAn） in acetone / water system was investigated. The reaction mechanism was obtained from analyses of open circuit potential,polymerization temperature,intrinsic viscosity and molecular structure of the intermediates. The results showed that the particle size and molecular weight of synthesized PAn can be effectively controlled in acetone / water system. When volume ratio of acetone / H2 O is 0. 2, the synthesized PAn has better performance. In acetone / water system,high potential time,chain growth time and the acceleration response time have been greatly extended in the polymerization process. As-synthesized PAn is head-totail structure. In the chain-terminating step,the high oxidation state in termediates gradually transformed to PAn products.