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Effect of thermal degradation on the mechanical properties of a diglycidyl ether of bisphenol A/1,3‐bisaminomethylcyclohexane (DGEBA/1,3‐BAC) epoxy resin system
Author(s) -
Barral L.,
Cano J.,
López J.,
Nogueira P.,
Ramírez C.
Publication year - 1997
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/(sici)1097-4628(19970328)63:13<1841::aid-app17>3.0.co;2-0
Subject(s) - diglycidyl ether , epoxy , bisphenol a , degradation (telecommunications) , composite material , materials science , ether , thermal , polymer chemistry , chemistry , organic chemistry , computer science , telecommunications , physics , meteorology
The effect of thermal degradation on the mechanical properties of a diglycidyl ether of bisphenol A (DGEBA)/1,3‐bisaminomethylcyclohexane (1,3‐BAC) epoxy system, cured with two different curing cycles—a short cycle and a long cycle—were studied using tensile and Izod impact experiments and scanning electronic microscopy, SEM, observations. From these experiments it can be noted a loss of mechanical properties of the material cured with both cycles with aging time, although the material cured with the long cycle presents better properties at any aging time. This better behavior can be explained from the time temperature transformation, TTT, diagram of this system. A good correlation was observed between the decrease in the intensity of the peak of β transition in tan δ curve obtained by dynamic mechanical analysis, DMA, and the decrease of the Izod impact strength when thermal aging is increasing. Also, a good correlation can be found between the increase in the fragility of the material with aging time and the morphology of fractured surfaces observed by SEM. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1841–1849, 1997