Abstract
The degree of crosslinking of epoxy compositions based on ED-20 and DEG-1 epoxy resins has been investigated over a wide range of temperature to determine the extent to which mechanical properties of the resins are influenced by varying amounts of a polyester plasticizer, the dibutyl ester of poly(diethyleneglycolmalete dipinate) in which the ratio of the maleic and adipic acids was varied. It is shown that a less dense network of chemical crosslinks is formed when the polyester plasticizer is introduced, and the glass transition temperature of the compositions is lowered. Light has been shed on the anomalous character of the concentration dependence of the breaking stress, the forced elastic limit, the elastic modulus and the stress relaxation intensity.
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