Study on Shape-Memorizing Function of Ethyl-Vinyl Acetate Copolymer

The characters of shape-memorizing polymer were analyzed and some evaluations standard on it were proposed,such as shape recovered rate,shape fixed rate and shape recovered speed,etc. The shape memorizing function of the EVA plastic had been studied,the results indicated that the EVA plastics can be cross-linked with DCP ,and the properly cross-linked EVA will have a good shape memory properties, which shape-recovering rate and shape fixed rate can be 95% or more. The structure of EVA was also analyzed and the relationship between shape-memorizing properties and structure has been discussed. The result through DMTA analysis also indicates that the increasing content of DCP will decrease the molecular weight between the cross-linkage point(_c) of EVA. In additional, the study indicates that the shape fixed rate was linear to the ratio of melted modulus to room temperature modulus.