"Isomerisation" The importance of the polymer to be self-evident. Polyolefins and vinyl polymers having various three-dimensional structure of the different properties of the polymer composition of the market in a wide variety of products today. For example: high density polyethylene, low density polyethylene and linear low density polyethylene can be regarded as isomers of polyethylene. More typically various configurations of polystyrene and polymethyl methacrylate and the like. They have properties between isomers big difference. For condensation polymer isomers in performance also significantly different. Isomerism polyaddition polymer occurs during polymerization, and condensation phenomena are often heterogeneous polymer synthesis stage monomer was rejected. As we all know, and the aromatic ring in the petrochemical process nucleophilic or electrophilic substitution reaction produced isomer is inevitable. Study of these heterogeneous polymer obtained by a heterogeneous monomer can not only understand the relationship between structure and properties of polymers. But also for the comprehensive utilization of isomers is to improve the utilization of atomic necessary.