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Cure rates of some epoxy systems
Author(s) -
Jenkins Robert,
Karre Lowell
Publication year - 1966
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.1966.070100211
Subject(s) - diethylenetriamine , epoxy , absorbance , epoxide , infrared , materials science , activation energy , substrate (aquarium) , polymer chemistry , acetylthiocholine , composite material , cantilever , analytical chemistry (journal) , chemistry , organic chemistry , catalysis , optics , enzyme , aché , physics , chromatography , oceanography , acetylcholinesterase , geology
The property changes of Epon 828 crosslinked by either diethylenetriamine or m ‐phenylenediamine at several temperatures have been studied by two in situ techniques. The mechanical property changes were followed by continuously monitoring the changes in the fundamental frequency of vibration during cure of a resin‐coated substrate acting as a cantilever reed. The disappearance of the reactive epoxy group was followed in situ by continuously monitoring the absorbance of the infrared epoxide band at 915 cm. −1 . Correlation of the two techniques was accomplished by normalizing both the mechanical property and infrared data. The apparent energy of activation was calculated to be 10.4 and 11.4 kcal. /mole, respectively, for the m ‐phenylenediamine and diethylenetriamine systems by the mechanical technique, and 11.0 kcal./mole for the m ‐phenylenediamine crosslinked system by the infrared technique.