改性石墨烯/聚甲基丙烯酸甲酯复合材料的制备与正温度系数性能研究  

Preparation and PTC Properties of Modified Graphene/PMMA Composites

作　　者：胡振鹏[1] 辛萌[1] 郭小松[1] 郝春成[1] 

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2015年第6期660-664,669,共6页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(51077075);国家自然科学青年基金项目(51407098)

摘　　要：利用溶液混合法(SM)将经聚苯胺(PANI)改性后的石墨烯与聚甲基丙烯酸甲酯(PMMA)复合,制备出改性石墨烯/PMMA导电复合材料,并对这种复合材料的正温度系数(PTC)效应进行了研究。实验结果表明:经PANI改性后的石墨烯在PMMA中的分散程度比未经改性的石墨烯在PMMA中分散地更加均匀,且没有出现团聚。未经改性的石墨烯/PMMA材料的PTC现象不明显,且不稳定。而经PANI改性后的石墨烯/PMMA材料的PTC强度提高了4.6倍,并且PTC稳定性提高了50%。结合应力模型和隧道导电理论对其PTC效应的机理做了一些探讨。Graphene modified by polyaniline（PANI）/poly-（methylmethacrylate）（PMMA）composites was prepared by solution mixing method.Then the PTC properties of the composites were studied.Experimental results indicated that graphene modified by polyaniline could avoid agglomeration.Furthermore,the dispersion of modified graphene was more uniform than unmodified graphene in PMMA.There was no significant PTC effect in the unmodified graphene/PMMA composites.However,compared with unmodified graphene/PMMA material′s performance,the PTC intensity of modified graphene/PMMA composites increased 4.6times and the PTC stability increased by 50%.The mechanism of PTC effect was discussed by quantum tunneling theory and a stress model.

关 键 词：石墨烯 正温度系数 聚甲基丙烯酸甲酯 聚苯胺 

分 类 号：TB34[一般工业技术—材料科学与工程]