|Recent Development in the Polymerization of Vinyl Chloride
Graduate School of Engineering, Osaka City University, Sumiyoshi-ku, Osaka, Japan
Nippon Gomu Kyokaishi,(2008),81(1),29-34 General Review in Japanese
This review deals with the recent development of the polymerization of vinyl chloride (VC) from the point of controlled synthesis of the polymer. After the features and issues of radical polymerization of VC are described, we focused on the controlled synthesis of poly (vinyl chloride) (PVC) with living radical polymerization, anionic polymerization and transition metal catalyzed polymerization.
The polymerization of VC with alkyllithium (RLi) especially tert-butyllithium was able to achieve the control of main chain structure and molecular weight of the polymer. In the polymerization of VC with half-titanocene/methylaluminoxane (MAO) catalysts, the ligand effect of the half-titanocenes was observed. The half-titanocenes containing electrodonating ligand such as Cp*Ti(OPh)3/MAO were found to be favored for promoting the controlled polymerization. The PVC without anomalous units obtained with RLi and the half-titanocene complexes revealed more thermally stable than that obtained with radical initiators. Advanced PVC is expected to be produced by developing these controlled polymerizations.
Vinyl Chloride, Transition Metal Catalysts, Thermal Stability, Controlled Polymerization, Anomalous Structures