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

A 240 mL s.s-lined tube was charged with 5.0 g (21 mol) 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 top, 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##

1. temperaturewarmed
2. customat 20° C.
3. customcarried to 55° C. while the pressure
4. temperatureThe solid, white polymeric product was heated under vacuum to constant weight, 29.2 g
5. customa broad top, Tonset 271° C
6. customTpeak 297° C
7. customto 400° C.
8. customto 440° C
9. customto give very stable copolymer
10. custompressed at 330° C.

ORD-Eintrag

ord-d0e7612124034baebbdc0a558ce2fb7a

Quelldatensatz

uspto-grants-1994_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05334731