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Dielectric relaxation spectroscopy of poly(ethylene terephthalate)
Author(s) -
Pratt Graeme J,
Smith Michael J A
Publication year - 2002
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.785
Subject(s) - poly ethylene , crystallinity , dielectric , materials science , relaxation (psychology) , dissipation factor , ethylene , dielectric loss , polymer chemistry , spectroscopy , permittivity , composite material , organic chemistry , chemistry , optoelectronics , physics , catalysis , psychology , social psychology , quantum mechanics
Contour maps of dielectric loss tangent within the ranges 0.1 Hz to 3 MHz and −175 °C to +190 °C are presented for a commercial poly(ethylene terephthalate) (PET) in two initial states of crystallinity. Individual absorption regions resemble those for poly(butylene terephthalate) and are attributed to carbonyl‐driven α‐ and β‐relaxation processes and to Maxwell–Wagner–Sillars polarizations. Possible causes are considered for the asymmetry and structure apparent in the α‐peak of partially crystalline PET. © 2001 Society of Chemical Industry