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Preparation of silicone-graft copolymers by homogeneous radical copolymerization in supercritical carbon dioxide

✍ Scribed by Hiroshi Shiho; Joseph M. DeSimone

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 129 KB
Volume: 38
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(20000401)38:7<1139::aid-pola12>3.0.co;2-3

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✦ Synopsis

Copolymerizations of 1,1-dihydroperfluorooctyl methacrylate (FOMA; M 1 ) and methacryloxypropyl-terminated polydimethylsiloxane [M-PDMS (M n ϭ 5.9 K); M 2 ] and homopolymerization of M-PDMS in supercritical CO 2 are described. The homopolymerization of M-PDMS proceeded homogeneously without difficulty to produce oligomers (M n ϭ 30 K). The copolymerizations of FOMA and M-PDMS also proceeded homogeneously over a wide monomer feed ratio. The ratio of M-PDMS incorporated into the copolymer obtained was almost equal to the monomer feed ratio even up to the high conversion. The reactivity ratio r 1 was determined to be 1.66. DSC examination of the copolymers indicated a microphase-separated morphology consisting of poly-FOMA (PFOMA) and PDMS domains for all copolymer compositions.

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