期刊
APPLIED SURFACE SCIENCE
卷 275, 期 -, 页码 295-302出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2012.12.108
关键词
Dielectric; Polyurethane; Expanded graphite; Composites
类别
资金
- Ministry of Finances and Competitiveness [CDS2010-0044, MAT2012-33483]
Segmented polycarbonatediol polyurethane (PUPH) has been synthesized and modified with different amounts of graphite conductive filler (from 0 to 50 wt%). Thermal and dynamical thermal analysis of the composites clearly indicates changes in the polyurethane relaxations upon addition of graphite. Broadband dielectric spectroscopy has been used to study the dielectric properties of the (PUPH) and one composite in the frequency range from 10(-2) to 10(7) Hz and in the temperature window of -140 to 170 degrees C. Relaxation processes associated with different molecular motions and conductivity phenomena (Maxwell-Wagner-Sillars and electrode polarization) are discussed and related to the graphite content. (C) 2012 Elsevier B.V. All rights reserved.
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