Preparation of highly self-healable polyurethane using polyols with blocky segments of imide methacrylate
발표자
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초록
내용
In this study, a new type of crosslinked polyurethane is prepared for highly enhanced self-healing ability. Polyols with blocky segments of n-(phthalimido) ethyl methacrylate are first synthesized by reversible-radical addition fragmentation (RAFT) polymerization. The resulting polyols are then reacted crosslinker with multiple isocyanates to synthesized self-healable crosslinked polyurethanes (shPUs). To confirm the self-healing properties of shPUs, polyols with no imide groups are reacted with crosslinker to prepare conventional crosslinked polyurethanes (cPUs) as a reference. Interestingly, shPUs demonstrate remarkably enhanced self-healing ability compared to cPUs. FT-IR analysis reveals that the unique supramolecular network induced by strong hydrogen bonding interaction between urethane groups and serially connected imide groups in polyurethane. The self-healing and mechanical properties of samples are characterized by using single scratch analysis and universal tensile machine.