极低逾渗阈值的导电聚苯胺纳米复合膜_黄美荣.pdfVIP

DOI :10.15983/ki .jsn .2008.01.013 第36 卷　第1 期 陕西师范大学学报(自然科学版) Vol.36 　No.1 　2008 年1 月 Jo rnal of Shaanxi Normal University (Nat ral Science Edition) Jan.2008 　 :1672-4291(2008)01-0047-06 黄美荣, 　李新贵, 　杨海军 ( , 200092) 　:直接将改进的微乳液聚合法合成的纳米聚苯胺分别与聚乙烯醇和聚丙烯酰胺进行溶液共 混复合, 铸成纳米聚苯胺复合膜, 研究了聚苯胺的加入量对复合膜的电导率的影响.所得复合膜 的电导率符合逾渗规律, 且导电膜的逾渗阈值极低, 为0.04%左右, 其中PVA 纳米复合膜出现了 双逾渗行为.加入极少量的聚苯胺即可使膜的导电率发生突跃, 使其从绝缘体转变成半导体或导 体.逾渗阈值下的复合膜不仅力学性能良好, 而且透明性接近于纯基体膜,当膜中的聚苯胺质量分 数为0.1%时,PVA 复合膜对300 ～700 nm 波长的可见光的透过率为70 %～84%. :聚苯胺;纳米粒子;纳米复合膜;导电膜;逾渗阈值 :O633;TB332　:A Electroconductive polyaniline nano-composite films with an extremely low percolation threshold HUANG M ei-rong, LI Xin-g i, YANG Hai-j n (Instit te of M aterials Chemistry, College of Materials Science Engineering, Tongji University, Shanghai 200092,China) Abstract:The electrically cond cting nano-composite films w ith polyaniline (PAN )nanoparticles synthesized by a modified microem lsion polymerization were prepared by casting the blend of PAN nanoparticles w aterborne latexes w ith traditional w ater sol ble polymers s ch as polyvinyl alcohol (PVA)and polyacrylamide (PAM ), respectively .The effect of the PAN loading on the electrical cond ctivity of the res lted films is st died in detail.It is fo nd that the cond cting behavior of the films obeys the percolation law and show s an extremely low percolation threshold of 0.04 %, in w hich the PVA nano-composite films exhibit do ble percolation thresholds.The cond ctivity of the films increases dramatically even with adding an extremely small amo nt of PAN particles, simply realizing a transition from ins lator to semicond ctor or cond ctor.The films w ith PAN loading aro nd the p