Polyvinyl chloride (PVC) is a thermoplastic plastic formed by the free radical polymerization of vinyl chloride monomer. It can be regarded as a “flexible and rigid fire-resistant guardian” - it endows the material with natural flame-retardancy (self-extinguishing when exposed to fire) and excellent acid and alkali resistance, oil resistance, and electrical insulation properties by introducing chlorine atoms. Moreover, the hardness can be continuously adjusted from soft elastomer to hard rigid plastic by varying the amount of plasticizer, thus featuring adjustable mechanical properties, low cost, and diverse processing options. It is widely used in building pipes (drainage pipes, wire pipes), window and door profiles, cable insulation layers, artificial leather, raincoats, cling films, floors, and inflatable toys, etc., in situations requiring fire resistance, corrosion resistance, or wide range of soft-hard adjustment.