Abstract
The realization of high strengthen, large ductility, and multiple-responding for self-healing composites is an urgent problem to be solved for expanding practical applications in industry. Herein, a simple stagey was proposed to prepare multiple-responding self-healing composites, which possess outstanding both tensile strengths also ductility, by utilizing furfuryl-modified polydopamine particles (F-PDAPs) as crosslinkers in maleimide-terminated polyurethane (m-PU) based on Diels-Alder reaction. Due to the excellent photo-thermal effect of F-PDAPs and the existence of DA bonds, the composites exhibited excellent healing efficiency under NIR (91.83%) and thermal (92.54%) initiation, in particular, could locally and specifically repair any crack under near-infrared light conditions. Furthermore, the tensile strength of composite materials was reached up to 34.26 MPa with a high breaking strain of 800%. Besides, the composites exhibited outstanding adhesive strength that could be healed via thermally induced. Such excellent comprehensive performance gives the composite materials an opportunity to have great potential in the fields of coatings, binders, etc.
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