Study on Mechanism and Kinetics for Ring-Opening Polymerization of Cyclosiloxane

Cyclosiloxanes are converted into linear polysiloxane by the action of nucleophilic or electrophilic catalyst, temperature and radiation. The polymerization method is bulk polymerization and emulsion polymerization. Bulk polymerization can be divided into anionic polymerization and cationic polymerization. Anionic polymerization is that cyclosiloxanes are converted into linear polysiloxane by basic catalyst (nucleophilic agent). Cationic polymerization process is performed by acidic catalyst (electrophilic agent). Emulsion polymerization is polymerized by monomer, water (or other disperse medium) and emulsifying agent. According to emulsifying agent type, emulsion polymerization can also be mainly divided into anionic and cationic type. This review introduces the study on mechanism and kinetics for ring-opening polymerization of bulk polymerization and emulsion polymerization of cyclosiloxane, and at last analyzes the developing trends.