Covalent adaptable polyethylene copolymer network with reconfigurable shape memory effects
발표자
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초록
내용
Shape memory polymer (SMP) is an important class of smart materials which are able to recover to its original shape from a temporarily fixed shape when exposed to external stimuli. The SMPs typically have two structural features, i.e.cross-links that determine the permanent shape and reversible phase acting as a switching phase. Covalently crosslinked thermoset SMPs show superior shape memory performances and thermomechanical stability as compared to physically crosslinked thermoplastic SMPs. However, the thermoset SMPs cannot be reprocessable and recyclable, and the permanent shape cannot be reconstructed. In this study, covalent adaptable network with reconfiguralbe shape memory effects was prepared by chemical crosslinking of semicrystalline epoxy functionalized polyethylene copolymer by using a diamine bearing dynamic boronic ester bonds as a crosslinking agent. Thermomechanical properties, reprocessability and shape memory behavior of the crosslinked PE were characterized by DMA, DSC, and tensile testing.