文献类型：期刊文献

中文题名：聚氯乙烯/膨胀石墨导电复合材料的负温度系数效应

英文题名：Negative Temperature Coefficient Effect of Poly( vinyl chloride) / Exfoliated Graphite Conductive Composites

作者：刘玉锦[1];李秋影[1];陈腾辉[1];吴驰飞[1];郭卫红[1]

机构：[1]华东理工大学材料科学与工程学院,上海200237

年份：2016

卷号：32

期号：8

起止页码：75

中文期刊名：高分子材料科学与工程

外文期刊名：Polymer Materials Science & Engineering

收录：CSTPCD;;EI(收录号：20163402729990);Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

语种：中文

中文关键词：聚氯乙烯;膨胀石墨;负温度系数效应;发泡

外文关键词：poly （vinyl chloride） ; exfoliated graphite; negative temperature coefficient; foam

摘要：采用膨胀石墨（EG）对聚氯乙烯（PVC）进行改性研究,考察了EG含量和体系发泡与否对PVC/EG复合材料负温度系数（NTC）效应的影响。实验结果表明,PVC/EG复合材料的NTC效应随着EG含量的变化而变化,当EG含量低于渗流阈值（质量分数9%）时,复合材料的NTC效应灵敏度更高。在30-120℃的温度范围内,EG质量分数为4%时的未发泡和发泡PVC/EG复合材料的体积电阻率分别降低了3和4个数量级;相较未发泡的PVC/EG复合材料的NTC效应,发泡后的复合材料表现出更灵敏的NTC效应。PVC/EG复合材料在2个加热-冷却循环过程中表现出良好的NTC循环稳定性。并从材料内部结构观察分析了PVC/EG复合材料产生NTC效应的原因。
Poly （vinyl chloride） （PVC）/exfoliated graphite （EG） composites with negative temperature coefficient （NTC） effect were prepared. Effects of EG content and foam of the composites on the smartness of NTC effect were analyzed specifically. Results show that when the EG loading is below percolation threshold （that is 9 % EG）, PVC/ EG composites exhibit better smartness of the NTC effect. With the content of 4% EG, the volume resistivity of the un-foamed and foamed PVC/EG composite decreases as the temperature increases from 30 ℃ to 120 ℃, displaying a reduction of 3 and 4 orders of magnitude respectively. Results show that the foamed PVC/EG composites exhibit better smartness of the NTC effect. Moreover, they show good reversibility of the NTC behavior which is examined by means of heating-cooling cycle. In addition, the mechanism for the NTC effect of the PVC/EG composites was explained based on the variation structure of PVC/EG composites and EG content with the temperature.