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Viscoelastic behaviour of poly (trimethylene terephthalate) and related polyesters
Author(s) -
González César C.,
Pereña José M.,
Bello Antonio
Publication year - 1988
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19880200138
Subject(s) - polyester , relaxation (psychology) , viscoelasticity , glass transition , materials science , polymer , polymer chemistry , copolymer , atmospheric temperature range , polymer science , thermal , stress relaxation , composite material , thermodynamics , physics , psychology , social psychology , creep
Poly(oxytrimethyleneoxyterephthaloyl) (PTMT), poly(oxytrimethyleneoxytrimethyleneoxyterephthaloyl) (PTMTMT) and two copolymers derived from them have been studied by the use of a dynamic viscoelastometer. The four polymers show three relaxations α, β and γ in the temperature range between −150 and 200 °C. The α relaxation is the glass transition of the polymers, the β relaxation normally occurs in the vicinity of −70 °C, and the γ relaxation, usually overlapped by the β one, takes place at temperatures around −120 °C. The influence of the thermal history on the nature, location and intensity of the three relaxations is discussed.