A network structure formed by interpenetration of molecular chains and cross-linking of at least one polymer molecular chain through chemical bonds. 19 14 years, Ellsworth first made IPN structural polymer from natural rubber, sulfur and partially reacted phenolic resin. JJPStaudinger applied for the first IPN patent in 194 1 year, and after1year, semi-IPN based on methyl methacrylate with smooth surface and transparent plastic was synthesized. 1960 Miller first used the term IPN. Since 1970, sperling Group and Frish Brothers Group have done a lot of research, and IPN has been widely used as an impact-resistant material. Production of ion exchange resin, damping material, thermoplastic elastomer, etc.