Structural Effects of Hard Segments for Urethane Bonds in Self-healing Polymers
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Self-healing materials are a rapidly emerging research topic that could improve the safety and prolong the lifetime of materials where self-healing could be defined as the ability that heals defects or damaged parts in the material. For permanent self-healing ability, reversible chemistry such as hydrogen bonds, ionic bonds, and complexation has been adopted to design self-healing polymers. We recently designed and synthesized self-healing polymers based on zwitterion terminated polycarbonate which is extended by urethane bonds using various hard segments such as isophoronediisocyanate, 4,4'-methylenebis (cyclohexylisocyanate) and hexamethy lene diisocyanate. The self-healing ability and intrinsic properties such as transparency and flexibility were varied dependent on hard segment structures. This structural effect in self-healing ability dependent on hard segment structures was investigated upon mechanical properties, crystallinity, and thermal properties of polymers