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纳米石墨微片/聚氯乙烯复合材料的制备与性能

, PP. 8-15

Keywords: 聚氯乙烯,纳米石墨微片,熔融共混,导电,复合材料

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Abstract:

利用超声作用制备纳米石墨微片(nano-Gs),并采用混酸对其进行表面活化,最后通过熔融共混法制备nano-Gs/聚氯乙烯(PVC)复合材料。通过FTIR、SEM对nano-Gs的结构进行表征,并研究了nano-Gs对nano-Gs/PVC复合材料导电性能和力学性能的影响。FTIR分析表明:nano-Gs经混酸处理后表面活性官能团含量明显升高,并与PVC分子链发生一定程度的氢键作用;SEM图片显示:nano-Gs厚度为30~80nm,其微片宽度为4~20μm,在PVC树脂基体中呈无规状均匀分布;导电性能测试表明:随着nano-Gs含量升高,nano-Gs/PVC复合材料的体积电阻率呈非线性降低趋势,最低为103Ω·cm,nano-Gs的逾渗阈值为10%(质量分数);力学性能测试表明,随着nano-Gs含量升高,nano-Gs/PVC复合材料的拉伸强度及缺口冲击强度均先升高后降低,nano-Gs质量分数为1%时,复合材料的拉伸强度及缺口冲击强度均达到最大值,相比纯PVC分别升高约14%和38%。

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