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Effects of heat treatment on dynamic mechanical properties of nonstoichiometric, amine‐cured epoxy resins
Author(s) -
Hirai T.,
Kline D. E.
Publication year - 1973
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.1973.070170103
Subject(s) - epoxy , amine gas treating , materials science , composite material , gelcoat , polymer chemistry , organic chemistry , chemistry
Abstract Epoxy resins cured with diethylenetriamine (37%–103% of stoichiometric composition) were heat treated at 120°C, and the dynamic elastic modulus and internal friction of the specimens were measured over the range of 85°–300°K. Results indicate that heat treatment causes the dynamic modulus to decrease at 85°K and at room temperature, but to increase over the region 150°–200°K. The γ‐ (∼150°K) and β‐(∼250°K) peaks merge into a single broad peak with heat treatment, and a β′‐peak is observed in the heat‐treated samples. Effects of heat treatment also depend upon the amount of diethylene‐triamine used.