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Effects of cure treatment on glass transition temperatures for a BADGE–DDM epoxy resin
Author(s) -
Ellis B.,
Found M. S.,
Bell J. R.
Publication year - 1996
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(19960307)59:10<1493::aid-app1>3.0.co;2-h
Subject(s) - epoxy , glass transition , materials science , composite material , cure rate , amine gas treating , polymer chemistry , chemistry , organic chemistry , polymer , surgery , medicine
The extent of cure for epoxy resin (BADGE) with a small excess of amine hardener (DDM, 4w/o) was determined by assay of the epoxy groups using near infrared spectroscopy. The effect of cure time at 100°C and postcure time at 180°C has been investigated. For the lower temperature cures the room temperature density, ρ rt , increased with time, reaching a maximum at X e = 0.37, and then decreased with extended cure times. For postcure, there was a monotonic decrease in ρ rt that was unrelated to the extent of cure. There was an approximate linear relationship between glass transition temperature and In( t ), which increased even when essentially all of the epoxy groups had reacted, that is X e ∼ 0.99. © 1996 John Wiley & Sons, Inc.