Novel fluorinated polyurethane elastomers were synthesized by two step urethane reaction of the fluorinated polyols based poly(vinylidenefluoride-co-hexafluoropropylene and diisocyanate such as 4,4'-methylene-bis(phenyl isocyanate)MDI in the presence of a solvent, followed by subsequent chain extension with low molecular weight diol such as 1,4-butanediol. Prior to synthesis of fluorinated polyurethanes, the well-defined a,?-diiodo-poly(VDF-co-HFP) with narrow uniomodal molecular weight distribution was polymerized by Iodine Transfer Polymerization, which are one of the controlled 'Pseudo-living' free radical telomerization methods. The structure and functionality of these dihydroxy fluoro polymers were characterized by 1H-NMR, 13C-NMR, 19F-NMR and end-group titration and showed high conversion. As these fluorinated polyol with the molecular weight below 3,000g/mol were used as telechelic fluorinated prepolymer for the synthesis of fluorinated polyurethane with low surface energy and good hydrophobic surface properties.   

Synthesis and characteristics of novel fluorinated polyurethanes

246th National Meeting (2013)

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