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8212175 
Journal Article 
EFFECTS OF VARIATION IN COMPOSITION AND TEMPERATURE ON THE AMINE CURE OF AN EPOXY MODEL SYSTEM 
Byrne, CA; Hagnauer, GL; Schneider, NS 
1980 
ACS 
Washington, DC 
43 
691-696 
This paper reports on model compound studies on the amine cure of epoxy resins usng High Performance Liquid Chromatography. The model system used included phenyl glycidyl ether (PGE), p-chloroaniline (PC1A) as curing agent and Monuron left bracket (3-p-chlorophenyl)-1,1-dimethyl urea right bracket as accelerator. Three types of reactions were occurring during cure of the model system and they are shown in Schemes 1, 2, and 3. It is demonstrated by experimental data that changes in the amine to epoxy ratio, the concentration of the accelerator and temperature can affect the chemistry of cure. The amounts of starting materials remaining, as well as the amounts of addition and polymerization taking place all vary. The possible implications for the cure of real epoxy systems are significant. Differences in network structure, amounts of polar species and hydrogen bonding can be expected to affect the mechanical properties, water uptake and stability of the cured resin. The effects of changes in temperature of reaction indicate that subtle variations in pre-cure history may alter the ultimate properties of the cured resin.