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Dielectric relaxation study of low‐density polyethylene by thermally stimulated depolarization currents and thermal sampling
Author(s) -
Dueñas J. M. Meseguer,
Ribelles J. L. Gomez,
Calleja R. Diaz
Publication year - 1989
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.1989.070370617
Subject(s) - relaxation (psychology) , dielectric , depolarization , materials science , polyethylene , intensity (physics) , thermal , low density polyethylene , nuclear magnetic resonance , analytical chemistry (journal) , condensed matter physics , composite material , thermodynamics , chemistry , optics , physics , organic chemistry , optoelectronics , psychology , social psychology , medicine , endocrinology
The dielectric relaxation zone of a low‐density polyethylene has been studied by thermally stimulated depolarization currents (TSDC) and thermal sampling (TS). Three relaxations have been found in this zone, which have been labeled γ I , γ II , and γ III in decreasing order of temperature. Samples of different crystallinities were subjected to several thermal treatments in order to study the molecular origin of each relaxation. The γ I relaxation intensity changes with the thermal treatment, while the intensity of the γ I relaxation is only slightly modified. Using TS it has been proved that the γ I relaxation fulfils the compensation law with a high level of significance. Nevertheless, the experimental data are not enough to verity the γ I and γ III relaxation.