Preparation and properties of PEI-GO composite modified castor oil-based shape memory elastomers
The castor oil based polyurethane acrylate(COPUA)containing dynamic covalent disulfide bond was synthesized.Then,the COPUAEP elastomer was prepared by crosslinking and copolymerization of COPUA and epoxy resin.In order to further improve the comprehensive properties of elastomers,aminated graphene oxide(PEI-GO)with rich amino groups on its surface was prepared with polyethylenimine as modifier,and a series of PEI-GO modified castor oil based composite elastomers were finally prepared.The molecular structure analysis showed that castor oil based active intermediates,PEI-GO and other target products were successfully synthesized.The mechanical properties,thermal properties and shape memory properties were analyzed.The results showed that the thermal stability,mechanical properties and shape memory properties of the composite elastomer doped with 1.5 wt％PEI-GO were significantly improved due to better dispersion and matrix compatibility.Compared with the unmodified COPUAEP elastomer,the tensile strength was increased by 28.8％,the 5％thermal weight loss temperature was 258.48 ℃ with an increase of 73.72 ℃,and the shape memory fixing rate and shape memory cycle performance were significantly improved under the four temperature variable cycle test.The fabricated composite elastomers would possess broad application prospects in the field of conductive materials and flexible electronic devices.
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