The Curing of Epoxy Resins (X):The Curing of Epoxy Resins with Carboxylic Acyl Hydrazides, and the Structures and the Properties of the Cured Resins
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概要
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The curing of epoxy resins with various carboxylic acyl hydrazides was studied by means of DTA, and the structure of the cured resins was also studied with dynamic mechanical properties.<BR>Hydrazides having the melting point above 150°C were found to be effective as curing agents for epoxy resins, and epoxy resins cured on heating at about 150°C. The lower the melting point of hydrazides having melting point below 150°C, the shorter the pot life and the lower the curing temperature for the hydrazide-epoxy resin systems.<BR>The glass transition temperature (T<SUB>g</SUB>) of the hydrazide cured resins increased with the increase of the crosslinking density. T<SUB>g</SUB> of the cured resins with about the same crosslinking density increased, like as diamine systems, as in the following order, aliphatic dihydrazide<hydrazide with phenyl group in side chain<aromatic hydrazide, but these T<SUB>g</SUB> were higher than that of the diamine cured resin of the same structure.<BR>Many of these cured epoxy resins showed good bending strength and bonding strength such as 900-200 kg/cm<SUP>2</SUP> and 200 kg/cm<SUP>2</SUP>, respectively.
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