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Preparation and properties of carbon black/polymer composites with segregated and double-percolated network structures |
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| Authors: | Yu Bao Ling Xu Huan Pang Ding-Xiang Yan Chen Chen Wei-Qin Zhang Jian-Hua Tang Zhong-Ming Li |
| Affiliation: | 1. State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, Sichuan, China 2. Analytical and Testing Center, Sichuan University, Chengdu, 610065, Sichuan, China 3. College of Chemical Engineering, Sichuan University, Chengdu, 610065, Sichuan, China |
| Abstract: | A carbon black (CB)/low-density polyethylene (LDPE)/ultrahigh-molecular-weight polyethylene (UHMWPE) composite with a segregated and double-percolated structure has been fabricated using the solution mixing and high-speed mechanical mixing method. Structural observations show that the conducting CB/LDPE layers were only dispersed at the interface of UHMWPE granules and formed a well-developed CB conductive network with a percolation threshold of 0.26 vol%. The low percolation threshold in CB/LDPE/UHMWPE composites can be explained by the segregated and double-percolated networks of CB within the polymer matrix. A noticeable double positive temperature coefficient of resistivity can be observed around the melting temperature of LDPE and UHMWPE followed by a negative temperature coefficient of resistivity. The microstructure evolution of CB/LDPE/UHMWPE composites can be observed and explained by in situ optical micrographs. |
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