导电聚苯胺纳米纤维对聚乙烯／炭黑复合体系电阻行为的影响

Influence of Conducting Polyaniline Nanofibers on the Resistivity Behavior of Low-Density Polyethylene/Carbon Black Composites

采用水溶液氧化聚合和热掺杂相结合的技术制备十二烷基苯磺酸掺杂的聚苯胺(PANI-DBSA)纳米纤维,并将PANI-DBSA纳米纤维与低密度聚乙烯(LDPE)和炭黑(CB)进行熔融共混制得PANI-DBSA/LDPE/CB导电复合材料,研究了PANI-DBSA纤维的引入对导电复合材料电阻行为的影响。结果表明,添加PANI-DBSA纳米纤维,复合材料的逾渗阀值移向较低炭黑含量,复合材料的PTC强度得到一定程度的提高,复合材料的电阻率-温度曲线的热循环稳定性得以改善。

Polyaniline （PANI） nanofibers doped by dodecylbenzenensulfonic acid （PANI-DBSA） were synthesized by the chemical oxidative polymerization and thermal doping technique. Conducting composites composed of PANI- DBSA nanofibers, low-density polyethylene （LDPE） and carbon black （CB） were prepared by melt processing. The effect of PANI-DBSA nanofibers on the resistivity behavior was investigated in detail. The results show that the LDPE/CB/PANI-DBSA conducting composites present a lower percolation threshold due to the easy formation of conducting paths for PANI-DBSA nanofibers in the LDPE. The positive temperature coefficient （PTC） intensity is enhanced and the reproducibility of electrical conductivity in heating/cooling cycles is improved after the introduction of PANI-DBSA nanofibers.