气液相聚合制备蒙脱土/聚吡咯的结构特征及其导电性能

Template synthesis flake like polypyrrole and montmorillonite/polypyrrole composites by vapor-liquor phase polymerization

以FeCl3为氧化剂,与钠基蒙脱土(MMT)以不同比例进行离子交换后所得悬浮液与吡咯(Py)单体进行气液相聚合,制备出蒙脱土/聚吡咯(MMT/PPy)复合材料。XRD、FTIR和SEM分析表明,Py单体在MMT的片层间发生了聚合反应,MMT的层间距随PPy含量增加不断变大。MMT/PPy复合材料呈现出MMT和PPy的红外特征吸收峰,但某些吸收峰出现蓝移。SEM观察显示MMT/PPy呈片状形态特征。当其中的MMT去除后,PPy仍为片状结构,与纯PPy的球粒形貌不同。电导率测试表明,MMT/PPy复合材料的电导率随PPy含量增加而提高,至40.9 wt%PPy含量时,MMT/PPy的电导率已达到PPy的电导率水平(10-1S/cm),含54.3 wt%PPy的MMT/PPy电导率甚至略高于PPy。

A serial montmorillonite（MMT）/polypyrrole（PPy） composites（MMT/PPy） were prepared by vapor-liquor phase polymerization of pyrrole vapor with Fe3＋ impregnated MMT suspension.It was found that the polymerization of pyrrole took place within the silicate layers of MMT.XRD of MMT/PPy composites showed that the basal spacing of MMT layers increased with increasing the PPy content.FTIR of MMT/PPy exhibited both characteristic adsorption peaks of MMT and PPy,while some peaks appeared blue shift.The obtained MMT/PPy displayed flake like morphology.Even after etching of MMT from MMT/PPy by HF,the resultant PPy still displayed a flake-like morphology,which was very different from the inherent globular PPy obtained by the same method.The conductivity of MMT/PPy became higher with increment of the PPy content.When the PPy content reached 40.9 wt%,the composite possessed almost the same conductivity as PPy.Furthermore,the composite containing 54.3 wt% PPy even showed a higher conductivity than PPy.This phenomenon might be attributed to the special morphology of the PPy in composite,which was caused by in situ polymerization within a confined space of MMT layers.