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The effects of annealing and aging in water on the properties of an amorphous copolyester
Author(s) -
Golovoy A.,
Cheung M. F.
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.1989.070370415
Subject(s) - materials science , ultimate tensile strength , crystallization , brittleness , composite material , annealing (glass) , elongation , amorphous solid , izod impact strength test , modulus , dynamic mechanical analysis , polymer , chemistry , organic chemistry
The influence of annealing in a dry oven and aging in water bath at 98°C on the thermal and mechanical properties of an amorphous poly(1,4‐cyclohexandimethylene/ethylene terephthalate) was studied up to 21 days. Oven annealing brought about crystallization, an increase in the tensile modulus and yield strength, and a decrease in elongation and Izod impact strength. The intrinsic viscosity, however, did not change. The samples that were immersed in water embrittled at a faster rate as a result of the combined adverse effects of hydrolysis and crystallization. The intrinsic viscosity decreased from 0.71 to 0.53 after 21 days. Within the limits of this study, the hydrolysis was found to be a zero‐order process with respect to molecular weight. A transition from ductile (> 8% elongation) to brittle failure in tension was observed between 3 and 5 days.