Visible Light-driven Self-healable Mechanochromic Polyurethanes

Abstract

Polyurethanes incorporating spiropyran(SP) and diselenide (DiSe) in the main chain, which are confined in different hard segments are developed. Visible light-driven diselenide metathesis and mechanically induced ring opening of SP offer self-healing and mechanochromic properties of the polymers, respectively. Delicate selection of the polymer backbone is found essential to promote the dual functions. In particular for polyurethane with SP coupled into 4,4’-methylenebis(cyclohexyl isocyanate) and DiSe linked with isophorone diisocyanate, excellent mechanical, mechanochromic and self-healing properties are estimated. Moreover, combining self-healing and self-reporting moieties in one chain allows the discrimination of different healing mechanisms, including bond formation and chain entanglement, in a visualized way.

Keywords

Self-healing / Self-reporting / Polyurethane / Mechanochromic / Diselenide

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