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Influence of the thermal history on dielectric properties of poly(vinyl chloride)
Author(s) -
Calleja R. Díz,
Ribelles J. L. Gomez
Publication year - 1982
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760221311
Subject(s) - materials science , glass transition , dissipation factor , amorphous solid , dielectric , dielectric loss , vinyl chloride , thermal , activation energy , permittivity , composite material , polymer chemistry , analytical chemistry (journal) , polymer , thermodynamics , chemistry , crystallography , organic chemistry , physics , optoelectronics , copolymer
In this paper, we report dielectric permittivity and loss of poly (vinyl chloride) samples that have received three different thermal treatments: (a) as received, (b) quenched from 110°C to 20°C and (c) slow cooled at 5°C/h. There are several observations: first, the secondary (β) loss peak‐is not representative of a simple mechanism of transition, in agreement with results of other authors (10), second, in the glass transition zone, there are clearly two peaks (α 1 and α 2 )—α 1 , is a typical peak of an amorphous glass transition; the second, α 2 , has possibly a crystalline origin—and, third (and the most interesting fact), there is an increase of the loss tangent in the intermediate zone between α and β peaks showing a new relaxational peak with high activation energy (70 Kcal/mole), in agreement with dynamic mechanical results (6).