Controlled polymerization of hexamethylcyclotrisiloxane was achieved by carrying out the polymerization first at room temperature to about 50% conversion and then at -20 °C until complete conversion in order to avoid side reactions. The poly(dimethylsiloxane)s produced show narrow molecular weight distributions (Mw/Mn≤1.1). Using this approach, a model linear triblock copolymer PS-b-PDMS-b-PS, as well as 3-miktoarm star co- and terpolymers of the (PDMS)(PS)2 and (PDMS)(PS)(PI) type, where PS is polystyrene, PI is polyisoprene, and PDMS is poly(dimethylsiloxane), have been prepared.
ASJC Scopus subject areas
- Materials Chemistry