取向微孔结构的PVA/CB导电复合材料对流动有机蒸汽的响应行为  

Electrical Resistivity Response of an Aligned Macro-porous PVA/CB Composite to Flowing Organic Vapors

作　　者：许向彬 

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《塑料科技》2014年第4期62-65,共4页Plastics Science and Technology

基　　金：科技部科研院所技术开发研究专项资金(2013EG122195)

摘　　要：通过定向冷冻干燥法,制备了取向微孔结构的导电聚乙烯醇/炭黑(PVA/CB)复合材料。研究分析了该导电复合材料的微观结构、逾渗行为及其对有机蒸汽的响应行为。结果表明:大量的CB聚集体不均匀地分布在该PVA/CB复合材料的微孔壁上,并且孔壁之间的CB搭接成较完善的导电通路,通过计算可得出该导电复合材料的逾渗阈值为16.9%;该PVA/CB复合材料在流动的四氢呋喃(THF)、丙酮、丁酮和苯蒸汽中的最大响应率分别为204、183、95、44,其响应率的不同是由于这4种有机蒸汽对PVA基体具有不同的溶胀效果。A kind of conductive polyvinyl alcohol/carbon black （PVA/CB） composite with aligned macro- porous structure was prepared by a directional freeze-drying process, and the microstructure, percolation behavior, organic vapor stimuli-response behavior of the conductive composite were studied. The results show that many CB aggregates locate and overlap on the surface of macro- pores, forming the conductive pathways in the PVA/CB composite. The percolation threshold of the PVA/CB composite is 16.9%. The maximum responsivities of the PVA/CB composite are 204, 183, 95 and 44 in flowing tetrahydrofuran （THF）, acetone, butanone and benzene vapors, respectively. The different organic vapor stimuli-response behaviors to the four kinds of organic vapors are due to the different swelling capacities of PVA matrix.

关 键 词：聚乙烯醇 炭黑 定向冷冻干燥 取向微孔结构 逾渗行为 有机蒸汽响应行为 

分 类 号：TB332[一般工业技术—材料科学与工程]