Macromolecular Research, Vol.25, No.10, 1028-1034, October, 2017
Synthesis of Novel Telechelic Fluoropolyols Based on Vinylidene Fluoride/Hexafluoropropylene Copolymers by Iodine Transfer Polymerization
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Well-defined α,ω-diiodo-poly(vinylidene fluoride (VDF)-co-hexafluoropropylene (HFP)) with a narrow unimodal molecular weight distribution (polydispersity index < 1.3) was subjected to iodine transfer polymerization, which allows controlled ¨pseudo-living〃 free radical telomerization. The molecular weight of the obtained polymer increased linearly with polymerization time, and the molecular weight distribution was determined by size exclusion chromatography. The prepared α,ω-diiodo-poly(VDF-co-HFP) was converted to α,ω-bis(hydroxyethyl)-poly(VDFco- HFP) as a novel telechelic fluoropolyol by incorporation of ethylene units and subsequent hydrolysis with aqueous bicarbonate (acting as a nucleophile and phasetransfer reagent) in hexamethylphosphoramide, a polar aprotic solvent. The obtained fluorinated polyol was characterized by 1H, 13C, and 19F NMR and exhibited a molecular weight below 3,000 Da, making it a suitable telechelic fluorinated prepolymer for the synthesis of fluorinated polyurethanes or their acrylate oligomers.
Keywords:fluoropolymer;fluorinated polyol;iodine transfer polymerization;fluorinated prepolymer;polyvinylidene fluoride copolymer;fluoropolyo
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