| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| 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
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| 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 |
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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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Published: 10 May 2021
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| Fund:Fund of Education Department of Shaanxi Province(20JK0564) and Talent Launch Project of Shaanxi University of Technology (SLGRCQ2001). |
| About author:: Zhongguo Zhao is a lecturer at Shaanxi University of Technology. From September 2013 to July 2019, he obtained the master's degree and doctor's degree in the college of polymer science and engineering, Sichuan University. After graduation, he works at Shaanxi University of Technology. He has published more than 20 papers in academic journals at home and abroad, including 6 SCI papers as the first author and 3 international conference papers, applied 5 national invention patents and 3 of them were authorized. His research interests focus on the research of polymer high performance and sensor applications. He has participated in a number of national natural fund projects, horizontal projects, and China-UK bridge projects. |
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2021, Vol. 35 
