Effect of the matrix crystallinity on the percolation threshold and dielectric behavior in percolative composites |
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| Authors: | Yun‐Jia Li Man Xu Jun‐Qiang Feng Xiao‐Long Cao Yan‐Fei Yu Zhi‐Min Dang |
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| Affiliation: | 1. State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China;2. Key Laboratory of Beijing City for the Preparation and Processing of Novel Polymer Materials, Ministry of Education Key Laboratory for Nanomaterials, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China |
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| Abstract: | Through the use of polyethylenes with different crystallinities as matrices, the effects of the matrix crystallinity on the percolation threshold and dielectric behavior of percolative composites have been investigated. The results suggest that the percolation threshold is negatively related to the matrix crystallinity, whereas the enhancement of the dielectric constant is positively related to the matrix crystallinity. A two‐dimensional diagram is proposed to illustrate such relationships. In addition, it has been found that the insulator–conductor transition is much flatter in low‐crystallinity‐matrix‐based composites, and this may be favorable for preparing threshold composites with a high dielectric constant and a low loss tangent. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 |
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| Keywords: | blending composites conducting polymers dielectric properties matrix |
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