Fluorinated vinyl ether homopolymers and copolymers: Living cationic polymerization and temperature-induced solubility transitions in various organic solvents including perfluoro solvents

Autor: Shokyoku Kanaoka, Dai Fukami, Sadahito Aoshima, Hiroaki Shimomoto
Rok vydání: 2011
Předmět:
Zdroj: Journal of Polymer Science Part A: Polymer Chemistry. 49:2051-2058
ISSN: 0887-624X
DOI: 10.1002/pola.24634
Popis: Partially fluorinated poly(vinyl ether)s with C4F9 and C6F12H groups in the side chain were synthesized via living cationic polymerization in the presence of an added base in a fluorine-containing solvent, dichloropentafluoropropanes. For comparison, the polymerization of vinyl ether monomers with C2F5 and C6F13 groups and nonfluorinated monomers were also carried out. The characterization of the product polymers using size exclusion chromatography with a fluorinated solvent as an eluent indicated that all polymers had narrow molecular weight distributions (Mw/Mn ∼ 1.1). Interestingly, the moderately fluorinated polymers with C4F9 exhibited upper critical solution temperature-type phase separation in various organic solvents with wide-ranging polarities, whereas highly fluorinated polymers with C6F13 are insoluble in nonfluorinated solvents. Polymers with C4F9 groups exhibited temperature dependent solubility transitions not only in common organic solvents (e.g., toluene, chloroform, tetrahydrofuran, and acetone) but also in perfluoro solvents [e.g., perfluoro(methylcyclohexane) and perfluorodecalin]. On the other hand, the solubility of polymers with C6F12H showed completely different from that of polymers with C6F13, despite their similar fluorine content. In addition, various types of fluorinated block copolymers were prepared in a living manner. The block copolymers with a thermosensitive fluorinated segment underwent temperature-induced micellization and sol–gel transition in various organic solvents. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011
Databáze: OpenAIRE
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