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Thermally induced double‐positive temperature coefficients of electrical resistivity in combined conductive filler–doped polymer composites
Author(s) -
Hou Yanling,
Zhang Peng,
Xie Miaomiao
Publication year - 2017
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.44876
Subject(s) - materials science , composite material , electrical resistivity and conductivity , temperature coefficient , low density polyethylene , electrical conductor , polyethylene , polymer , graphite , polypropylene , thermal expansion , phase (matter) , doping , conductive polymer , chemistry , electrical engineering , optoelectronics , organic chemistry , engineering
Polymer composites of low‐density polyethylene/polypropylene/graphite/vanadium dioxide (LDPE 0.8 /PP 0.2 /Gr 0.4 /VO 2 ) are prepared by classical melt‐mixing technology and show a notable double positive temperature coefficient of electric resistivity (PTC), which originates from the combined effect of highly conductive Gr and VO 2 with a thermal phase transition. When the weight ratio of VO 2 is 8 wt %, the positive temperature coefficient intensity (PTCI) for the composites reaches 3.85 orders of magnitude. The model system demonstrates the reason for the improvement in the PTC performance of the polymer composites by analyzing the construction of the conductive networks. Therefore, the addition of phase‐transition compounds may be a promising path to improving PTC materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44876.