Robust polyurethane networks with flame-retardant, antioxidative, self-healing and reprocessing capabilities from biobased naringenin and vanillin

Biobased reprocessable polyurethane (PU) networks have drawn significant attention due to limited petroleum resources and aggravating environmental issues. However, the preparation of biobased PU networks with simultaneous efficient flame-retardant, antioxidative, self-healing and reprocessing performance is a great challenge due to the complicated structural design required. A novel strategy to fabricate multifunctional PU networks containing dynamic phenol–carbamate bonds from biobased naringenin and vanillin has been developed. First, a vanillin-based diol containing organic phosphorus moieties (VD) was prepared. Then modified diol and naringenin were combined to produce a self-healable, recyclable, antioxidative and flame-retarded PU (NVP-x)s where x represents the molar ratio of n[-OH(VD)] / n{[-OH(naringenin)] + [-OH(VD)] + [-OH(PTMG)]} possesses excellent flame-retardant, antioxidative, self-healing and reprocessing performance due to the presence of dynamic phenol–carbamate bonds, organophosphorus and phenolic moieties. An effective approach to the manufacture of multifunctional PUs with a potential application in the field of self-healing and flame-retardant coating, wound dressing membranes and fire-control engineering materials has been demonstrated.