Crystalline Properties and Response Behavior of Polypropylene/Carbon Nanotube Composites to External Field
ZHAO Zhongguo, JIA Xumiao, CHENG Shaohua, WANG Miao, LIANG Panxu, LI Wanshun, JIA Shikui
National and Loal Engineering Laboratory for Slag Comprehensive Utilization and Environment Technology, School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China
Abstract: In this paper, PP/MWCNTs conductive composites with different contents of conductive fillers were prepared through melt blending. The relationship between temperature and conductivity were studied in detail by DSC, SEM and resistance meter. PP/MWCNTs conductive composites prepared by solution-mechanical blending had a low percolation threshold of about 2.1wt%, and with the increase of conductive filler, the thermodynamic stability and crystallization properties of polypropylene were significantly improved, and the thermodynamic decomposition temperature increased from 410.1 ℃ to 435.2 ℃.The analysis of temperature-resistance behavior of PP/MWCNTs conductive composites in single process temperature found that the conductive composites of PP/MWCNTs exhibited PTC effect in the temperature range from 25 ℃ to 180 ℃, and the maximum and minimum resistance values basically did not change, showing good monotonicity. The temperature-resistance behavior of PP/MWCNTs conductive composites exhibited good repeatability and stability in the cyclic process temperature between 25 ℃ and 145 ℃. In addition, in the analysis of resistance change at different heat treatment temperatures, it is found that the conductive network is destroyed and recombined with time going, and the crystal repulsion effect is also discerned. With the increase of the heat treatment temperature, the recombination time of the conductive network increases gradually, from about 5 min to 15 min.
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2021, Vol. 35 
