The Curing of Epoxy Resins (V):The Curing of Epoxy Resins with Imidazoles, and the Structure and the Properties of the Cured Resins
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概要
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The curing of epoxy resins with various substituted imidazoles was studied by means of DTA, and the structure of the cured resins from dynamic mechanical properties.<BR>The stronger the basicity of imidazoles, the stronger the curing activities for epoxy resin. The curing reactions with imidazoles not substituted in 1 position showed one peak nearly at 110°C by DTA. The curing reaction with imidazoles substituted in 1 position showed low broad peak from 20°C to 100°C and large peak at about 100°C.<BR>From these results, it was suggested that the initiation step of curing took place at the tertiary nitrogen in 3 position of imidazoles with epoxy groups, and the produced alkoxide ion initiated further polymerization of epoxy groups.<BR>The glass transition temperature (Tg) and the crosslinking density of imidazole cured resins were very higher than those of the tertiary amine cured resin.<BR>In these results, few termination and few chain transfer reaction were assumed to proceed in the polymerization of epoxy resin with imidazoles.<BR>Although the crosslinking density and Tg of the imidazole cured resins were higher than those for the diaminodiphenylmethane (DDM) cured resin, the heat deflection temperatures (HDT) of both resins were nearly the same, because the modulus of elasticity of the imidazole cured resins in which the flexible ethylene-ether main chain exists lowered than that of the DDM cured resin in the glass region when the temperature was raised.
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