Three kinds of shape memory polyurethane block copolymers (SMPU) were synthesized by controlling soft segment distribution using two soft segments of different molecular weight in a prepolymerization step, and were electrospun into nanofibers to investigate their shape memory function. Average diameter of SMPU nanofibers obtained was about 400 nm with smooth and circular cross-section for all samples. Best mechanical properties were found in block-type SMPU without any loss of shape memory effect compared with conventional SMPU.
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