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Annealing studies on a fully cured epoxy resin: Effect of thermal prehistory, and time and temperature of physical annealing
Author(s) -
Pang K. P.,
Gillham J. K.
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.1989.070381113
Subject(s) - annealing (glass) , materials science , glass transition , isothermal process , epoxy , composite material , thermal , thermodynamics , polymer , physics
The dynamic mechanical behavior at about 1 Hz of a fully cured epoxy resin (maximum glass transition temperature, T g ∞ , ca. 170°C) ahs been studied during and after isothermal annealing in terms of the influence of thermal prehistory, time of annealing, and temperature of annealing ( T a ). Annealing temperatures ranged from T g − 15 to T g − 130°C. The rate of isothermal annealing was observed to decrease by a decade for each decade increase of annelaing time when the material was far from equilibrium. Annealing at high temperatures did not measurably affect the mateiral properties during cooling (for T ≪ T a ); similarly the effect of annealing at low temperatures was not measurale during heating (for T ≫ T a ).