Preparation And Micellization Of Amphiphilic Polysiloxane Copolymers

The silicone oil with side group of glycidyl methacrylate (GMA) was prepared by the hydrosilylation reaction of polymethyhydrosiloxane (PHMS) and glycidylmeth acrylate (GMA) in toluene with using the isopropanol solution of H2PtCl6 as a catalyzer. The product was characterized by FTIR spectra and 1H-NMR spectra, and the results indicated that the silicone oil with side group of GMA was prepared successfully. The yield of the reaction was determined using chemistry titration by which the unreacted active hydrogen was detected. The effect of reaction temperature, reaction time, catalyst content and molar ratio of GMA to PHMS on the conversion yield were discussed.The amphiphilic graft copolymers, polyepoxymethylsiloxane-g-poly(N,N- dimethyl acrylamide) and polyepoxymethylsiloxane-g-poly(N-isopropylacryamide), were obtained through epoxy ring-opening polymerizations of polyepoxy methylsiloxane (PEMS) and hydroxyl-terminated poly(N,N-dimethyl acrylamide) (HO-PDMAAm) and poly(N-isopropylacryamide) (HO-PNIPAAm), respectively. Successful preparation of PEMS-g-PDMAAm and PEMS-g-PNIPAAm graft copolymers were verified by FTIR and 1H-NMR. Pyrene has been used as a fluorescence probe to investigate the micelle behavior of the graft copolymers. The experimental results indicated that the micelle behaviors of amphiphilic grafting copolymers were related to copolymer concentration and hydrophlilic side chain length and PEMS-g-PDMAAm could form mixed micelles with surfactant sodium dodecyl sulfate (SDS) or AEO9. UV has been used to investigate the lower critical solution temperature (LCST) of the graft copolymer PEMS-g-PDMAAm.