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The effects of physical aging on the thermal and mechanical properties of an epoxy polymer
Author(s) -
Jo Won Ho,
Ko Kyoung Jin
Publication year - 1991
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.760310406
Subject(s) - materials science , epoxy , diglycidyl ether , composite material , bisphenol a , ethylene diamine , volume (thermodynamics) , polymer , modulus , stoichiometry , diamine , thermal , polymer chemistry , nuclear chemistry , thermodynamics , organic chemistry , chemistry , physics
The effects of free volume on the thermal and mechanical properties of epoxies from diglycidyl ether of bisphenol A (DGEBA) and ethylene diamine (EDA) were investigated. The degree of free volume was controlled by the different thermal history. For fully cured expoxy systems, the density and modulus of both aged and quenched specimens decreased with increasing EDA concentration. However the yield stress of quenched specimens showed a maximum at about equal stoichiometric formulation, while that of aged ones decreased with increasing EDA concentration.