Electrical Conductivity and Thermal Stability of Polypropylene-Based Graphene Modified Composites

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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.

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	Articles by authors
	Zhang Xinzhuang
	Zhang Shuqin
	Yan Peng
	Pei Ting
	Dou Qian
	Dong Zhao
	Wang Shanshan

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

Received 2019-04-28;

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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,V36(6): 60-64

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