聚丙烯基石墨烯改性复合材料的导电及热稳定性

摘要以邻二氯苯（O-DCB）为溶剂，将超声预分散的石墨烯纳米微片（GNS）混入聚丙烯（PP）基材，再经塑化、热压成型获得GNS/PP复合材料。采用扫描电镜观察其微观形态变化，高阻计测量其电阻并计算出体积电阻率，同步热分析仪测试其在空气中的热稳定性能。结果表明，GNS在PP基材中分散均匀，并相互连接构成网络结构；GNS/PP复合材料的导电性能相较PP有了显著提升，当GNS质量含量为1%~2%时，复合材料出现明显的导电渗流现象，其体积电阻率降幅达6个数量级；当空气温度高于324℃时，在相同温度下，1% GNS/PP复合材料相较PP的失量更少，且整个失量阶段的温度跨度较PP提高40℃，但GNS的存在也导致GNS/PP复合材料的起始失量温度较PP提前30~40℃，并出现使材料完全失量的终点温度，且GNS质量含量越高，该终点温度越低。将低成本的GNS均匀掺入PP中能够获得导电性能优异并具备一定程度热稳定性的功能型复合材料。

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	张新庄
	张书勤
	闫鹏
	裴婷
	窦倩
	董昭
	王姗姗

关键词：石墨烯；聚丙烯；复合材料；溶液共混法；体积电阻率；热失量分析

Abstract： Using o-dichlorobenzene (O-DCB) as solvent, ultrasonic pre-dispersed graphene nanosheets (GNS) were mixed into polypropylene (PP) matrix, and GNS/PP composites were prepared after plasticizing and hot-pressing. Scanning electron microscopy (SEM) was used to observe micro-morphological changes of the samples, high resistance meter (HRM) was used to measure their resistance, and thermogravimetric analyzer (TGA) was used to test their thermal stability in air. The results show that GNS is uniformly dispersed in PP matrix and interconnected to form a network structure. The conductivity of GNS/PP composites is significantly improved compared with that of PP. When the mass content of GNS is 1%~2%, the electrically conductive percolation of the composites is obvious, and the volume resistivity decreases by 6 orders of magnitude. When the air temperature is higher than 324℃, the weight loss of 1% GNS/PP composite is less than that of PP at the same temperature, and the temperature span of the whole weight loss stage is 40℃ higher than that of PP. However, the existence of GNS also causes the initial weight loss temperature of GNS/PP composites to be 30℃~40℃ lower than that of PP, and the final temperature which makes the material completely weightless appears, and the higher the mass content of GNS, the lower the final temperature is. The functional composites with excellent conductivity and a certain degree of thermal stability can be obtained by evenly blending low-cost GNS into PP.

Keywords： graphene； polypropylene； composites； solution blending method； volume resistivity； thermogravimetric analysis

Received 2019-04-28;

Corresponding Authors: 张新庄,E-mail:zxzunm@163.com。 Email: zxzunm@163.com

About author: 张新庄(1985-),男,硕士,高级工程师,现从事能源化工及新材料方面的研究。

引用本文:

张新庄, 张书勤, 闫鹏, 裴婷, 窦倩, 董昭, 王姗姗.聚丙烯基石墨烯改性复合材料的导电及热稳定性[J]. 化学工业与工程, 2019,36(6): 60-64

Zhang Xinzhuang, Zhang Shuqin, Yan Peng, Pei Ting, Dou Qian, Dong Zhao, Wang Shanshan.Electrical Conductivity and Thermal Stability of Polypropylene-Based Graphene Modified Composites[J]. Chemcial Industry and Engineering, 2019,36(6): 60-64

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