GRAFT EMULSION COPOLYMERIZATION OF ACRYLATES AND SILOXANE

Graft acrylates and siloxane copolymer latexes were prepared by batch process via simultaneous radical and ring-opening copolymerization. Vi nyl septamethyl cyclotetrasiloxane (VD4) was used as a coupling agent to form chemical bonds between polyacrylates and polysiloxane. The occ urrence of graft copolymerization was confirmed by Soxhlet extraction and by the dynamic mechanical properties of later polymer. The results showed that polymerization behavior and final rater stability strongl y depend on siloxane content, with increase in siloxane content monome r conversion and later stability decreased. The mechanical properties of Inter film were influence not only by total siloxane con tent, but also by relative amount of VD4 to siloxane. (C) 1997 by John Wiley & S ons, Ltd.