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Effect of the matrix crystallinity on the percolation threshold and dielectric behavior in percolative composites
Author(s) -
Li YunJia,
Xu Man,
Feng JunQiang,
Cao XiaoLong,
Yu YanFei,
Dang ZhiMin
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26988
Subject(s) - crystallinity , percolation threshold , materials science , dielectric , composite material , percolation (cognitive psychology) , percolation theory , matrix (chemical analysis) , conductivity , chemistry , electrical resistivity and conductivity , physics , optoelectronics , quantum mechanics , neuroscience , biology
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