Preparation and Properties of Dynamic Disulfide Bond Self-healing Polyurethane Modified Asphalt
In order to enhance the long-term resistance to cracking of asphalt pavement,a self-healing polyurethane modified asphalt based on dynamic disulfide bonds was developed.Polyurethane chain extender containing disulfide bonds(CY-OA)was synthesized using cystamine dihydrochloride as raw material,and disulfide bond-crosslinked polyurethane elastomer(PU-SS)was synthesized through stepwise copolymerization.PU-SS was mixed with asphalt to obtain self-healing polyurethane modified asphalt(PSA).The physical and chemical properties,microscopic morphologies,and self-healing properties of PU-SS and PSA were studied.The results show that the addition of PU-SS improves the low-temperature deformation resistance of asphalt.The dynamic disulfide bond self-healing mechanism of PU-SS promotes the inherent self-healing ability of asphalt,achieving synergistic repair.
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