Abstract
Shape memory epoxy resins(SMEPs) with both high mechanical property and ideal shape memory performances were prepared by constructing double network structure through employing two kinds of curing agents with different reactivity. Results show that when the proportion of polyetheramine (D230) and diethyltoluenediamine (DETDA) are 40% and 60%, respectively, the tensile modulus, tensile strength and toughness of SMEPs are simultaneously enhanced compared with that of the samples cured with single curing agent. Meanwhile, shape memory properties still maintain at an ideal level when the proportion of D230 is 40%, while samples cured with pure DETDA show inferior shape memory property, especially at high tensile strain. DSC results show that the formation of network of sample cured with mixed curing agents can be divided into two steps, which may lead to a unique double network structure. Different network structures were characterized by DMA, TMA, and stress relaxation tests. Results show that physical network in the double network structure endows the epoxy resin with both enhanced strength and toughness while simultaneously maintained ideal shape memory performances.
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