Abstract: PVCcontaining different contents of carboxylic group was synthesized by VC/AA suspension copolymerization and then ionic crosslinked PVC was prepared by solution and melting processing in the presence of metal salt. The structure and properties of ionic crosslinked PVCwere investigated. It was shown that carboxylic group in copolymer existed in dimer form, and was partially coordinated with metal cation after neutralization. VC/AA copolymer with higher AAcontent and neutralized with Ca²⁺, Mg²⁺cations tended to form thermalreversible ionic pair aggregation structure. The content and stability of ionic pair aggregation phase were affected by ionic pair content and type of metal cation. T_g, melting viscosity and elasticity of PVC increased as ionic crosslinking was introduced.

Key words: Poly(vinyl chloride), Ionic crosslinking, Ionic pair aggregation