Synthesis and characterization of a novel fluorinated polyether glycol with fluorinated side chains via 'living/controlled' cationic polymerization

摘要

A novel fluorinated polyether glycol with fluorinated side chains is synthesized via "living/controlled" cationic ring-opening polymerization of tetrahydrofuran and fluorine-containing epoxy compounds (FO). The effects of polymerization conditions on monomer conversion, number-average molecular weight (M-n), molecular weight distribution (M-w/M-n) are measured. Our investigations have shown that the use of a mixed solvent (dichloromethane/1,4-dioxane) can prevent intra-and intermolecular transfer reactions, due to more nucleophilic oxygen atom in 1,4-dioxane. Using BE3 center dot CH3OH/CH2OHCH2OH as initiation system, polymers with predictable number-average molecular weight, narrow molecular weight distribution (1.03 < M-w/M-n < 1.08) were produced. On the basis of the reactivity ratio of FO/THF and monomer conversion, a mechanism of living/controlled polymerization has been proposed. (C) 2015 Elsevier B.V. All rights reserved.