Tetrafluoroethylene → Perfluoro-5-methyl2,3-dihydro-1,4-dioxin

Beteiligte Stoffe

Reaktionsschritte

A 240 mL s.s-lined tube was charged with 5.0 g (21 mmol) of monomer 14, 50 mL of CFCl2CF2Cl, 5 mL of cold 3% perfluoropropionyl peroxide catalyst in CFCl2CF2Cl, and 30 g (0.30 mol) of tetrafluoroethylene. The tube was agitated as the mixture warmed; at 20° C., a rapid exotherm carried to 55° C. while the pressure fell to 0 psig. The solid, white polymeric product was heated under vacuum to constant weight, 29.2 g. Analysis of the volatiles by GC indicated the presence of about 1.5 g (30%) of recovered monomer 14. For the polymer, DSC on reheat showed a broad mp, Tonset 271° C., Tpeak 297° C. TGA: 2% weight loss to 400° C., 3.5% weight loss to 440° C. Thus, copolymerization of 14 with TFE occurs readily to give very stable copolymer. A film pressed at 330° C. and 1800 psi for 2 min was clear and tough. ##STR36##

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