文章摘要
超临界CO2爆破剥离石墨/低密度聚乙烯导电复合材料
Preparation of Graphite/LDPE Conductive Composites via Supercritical Carbon Dioxide Explosion
  
DOI:10.16865/j.cnki.1000-7555.2019.0352
中文关键词: 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
英文关键词: supercritical carbon dioxide  low density polyethylene  graphite  conductive composite  conductive percolation  rheological percolation
基金项目:国家自然科学基金资助项目(51503061,31290610);湖北省科技支撑计划(2015BAA094)
作者单位
余 东,张 荣,刘清亭,付旭东,胡圣飞 湖北工业大学 绿色轻工材料湖北省重点实验室湖北 武汉 430068 
摘要点击次数: 54
全文下载次数: 0
中文摘要:
      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。
英文摘要:
      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 CO2 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.
查看全文   查看/发表评论  下载PDF阅读器
关闭