Synthesis and Properties of a New Fluoropolymer Obtained by Cyclopolymerization

Unconjugated 1,5- and 1,6-dienes are known to undergo intramolecular-intermolecular polymerization or cyclopolymerization to form polymers with cyclic mainchain structure1) , but a very few are reported about cyclopolymerization of fluoro- or perfluorodienes. Perfluorodienes with a general formula CF2=CF-(CF2 x CF=CF2 (x=1 to 4) and CF2=CFCF2 CFClCF2 CF=CF2 are reported to be cyclopolymerized under extreme high pressure (e.g.13.6katm) and gamma radiation, to yield amorphous soluble polymers2) . Perfluorinated divinylether with the formula of CF2 =CFOCF2 CF2 OCF = CF2 is also reported to be cyclopolymerized, but to form a gel containing polymer under the monomer concentration exceeding 12%3) (Scheme 1).