二次掺杂对聚苯胺导电复合物性能的影响

Effect of Secondary Doping on Properties of the Conductive Composites of Polyaniline

研究了聚苯胺与（苯乙烯-丁二烯）三嵌段共聚物或氯磺化聚乙烯的复合物在间甲酚二次掺杂前后电导率的变化（提高2个数量级），根据二次掺杂使聚苯胺复合物增强永久形变和断面形貌脆断结果，认为二次掺杂使卷曲的聚苯胺链展开并通过分子链间的弱相互作用而自行组成导电通路．复合物二次掺杂前后的抗张强度和伸长率变化不大，说明其主链间的弱相互作用对应力无贡献．此外，还研究了二次掺杂对复合物在中性和酸性介质中电致变色活性的影响，

The conductivity of composite, which was prepared by in situ emulsionpolymerization technique, shows different percolation thresholds: 21. 0% for PAn/CSPE and 7. 0%for PAn/SBS composites cast from solution. It Increases two orders of magnitude andexhibits a new percolation threshold 3. 0% for two kinds of composites after secondary dopingwith mucresol. The secondary doping noticeably increases permanent set change withpolyaniline content. The SEM image of broken section shows that the secondary dopingchanges the ductile fracture Into the brittle fracture. The results show that the secondarydoping induced a tenuous interconnected network through expanded polyaniline backbone.Secondary doping had no marked effect on tensile strength and elongation, which Indicatesthat the tenuous Interconnected network of the conductive component had no contribution forstress-transfer. Electrochromic performance of composite film was also studied in neutral oracidic electrolyte.