摘要
以低密度聚乙烯为基体,天然石墨为填料,通过熔融共混法制备了导电复合材料,并进一步采用超临界二氧化碳对其进行爆破处理,得到经CO2剥离分散后的导电材料。通过万用表、旋转流变仪和万能拉力试验机对超临界二氧化碳处理前后的复合材料的电性能、流变性能和力学性能进行了测试。结果表明,未经超临界二氧化碳处理,复合体系发生导电逾渗时填料含量为40%~45%,发生流变逾渗时填料含量为35%。经超临界二氧化碳处理后,导电逾渗发生时填料含量降低到25%~30%,体系的电阻率下降了1~2个数量级,流变逾渗现象出现的填料含量也降低至20%。并且与未经超临界二氧化碳处理的复合材料相比,处理后材料的拉伸强度与断裂伸长率均有所增加。
Conductive composites were prepared by melt blending method with low density polyethylene as matrix and natural graphite as filler.The composites were further treated by supercritical carbon dioxide explosion to obtain conductive materials after CO 2 stripping and dispersing.The results show that the content of filler is 40%~45%when the conductive percolation occurs,the content of filler is 35%when the rheological percolation occurs.With supercritical carbon dioxide treatment,the filler content decreases to 25%~30%when the conductivity percolation occurs,the resistivity of the system decreases by 1~2 orders of magnitude,and the filler content of the rheological percolation phenomenon also decreases to 20%.Compared with the composites without supercritical carbon dioxide treatment,the tensile strength and elongation at break of the treated composites are increased.
作者
余东
张荣
刘清亭
付旭东
胡圣飞
Dong Yu;Rong Zhang;Qingting Liu;Xudong Fu;Shengfei Hu(Hubei Provincial Key Laboratory of Green Materials for Light Industry,Hubei University of Technology,Wuhan 430068,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2020年第1期106-110,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51503061,31290610)
湖北省科技支撑计划(2015BAA094)
关键词
超临界二氧化碳
低密度聚乙烯
石墨
导电复合材料
导电逾渗
流变逾渗
supercritical carbon dioxide
low density polyethylene
graphite
conductive composite
conductive percolation
rheological percolation
