Fluorinated dioxolanes. 3. Nucleophilic reactions of perfluoro-4-methyl-1,3-dioxolanes

Yuminov, V. S.; Kartsov, S. V.; Maksimov, V. L.; Bargamova, M. D.; Фокин, А. В.

doi:10.1007/bf00953304

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“…The product of the decarboxylation reaction consisted of starting material, a small quantity of PFMMD and of saturated compound 5 . This method did not afford the monomer PFMMD in 55% yield as has been reported . Most of fluorocarbonyl 4 carbonized in the reaction mixture.…”

Section: Resultsmentioning

confidence: 74%

“…Decarboxylation of fluorocarbonyl 4 was reported to proceed in purified bis(2-ethoxyethyl) ether containing anhydrous sodium carbonate 18 (Scheme 2). Fluorocarbonyl 4 was added at ambient temperature in a suspension of anhydrous sodium carbonate in anhydrous bis(2ethoxyethyl) ether, and the reaction mixture was then heated at 130 °C with stirring.…”

Section: Resultsmentioning

confidence: 99%

“…This method did not afford the monomer PFMMD in 55% yield as has been reported. 18 Most of fluorocarbonyl 4 carbonized in the reaction mixture. Bis(2-ethoxyethyl) ether was replaced by perfluoro(tetradecahydrophenanthrene).…”

Section: Resultsmentioning

confidence: 99%

“…Decarboxylation of fluorocarbonyl 4 was carried out also in anhydrous bis(2-ethoxyethyl) ether 18 (Scheme 2). A decomposition product was analyzed by GC-MS and 19 F NMR.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

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Synthesis and Characterization of an Amorphous Perfluoropolymer: Poly(perfluoro-2-methylene-4-methyl-1,3-dioxolane)

et al. 2005

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A perfluorinated monomer, perfluoro-2-methylene-4-methyl-1,3-dioxolane (PFMMD), was synthesized by various methods. The monomer was polymerized in bulk and/or in the solution by a free radical mechanism using perfluorodibenzoyl peroxide and/or perfluorodi-tert-butyl peroxide as an initiators. The polymers obtained (poly(PFMMD)) were colorless and transparent. However, a polymer rod exposed to the atmosphere turned hazy. When the polymers were purified by precipitating the polymer solution into chloroform, they did not turn hazy when exposed to air for a long period of time and remained clear with a high UV-vis light transmittance. The glass transition temperature of the purified polymer was 130-134 °C. NMR measurements indicate that the purified polymers have mostly vinyl addition polymer structure. Nevertheless, we suppose that the pristine polymers contain structural units formed by ringopening polymerization. The molecular weight of poly(PFMMD) samples can be regulated using carbon tetrachloride, carbon tetrabromide, and sulfuryl chloride as chain transfer agents. Polymerization in the presence of these regulators is characterized by nondegradative chain transfer. The intrinsic viscosity of poly(PFMMD) samples was determined in hexafluorobenzene. Hexafluorobenzene is a thermodynamically good solvent for poly(PFMMD). The molecular weights of poly(PFMMD)s were characterized by the intrinsic viscosity and dynamic light scattering (DLS). The refractive index of poly(PFMMD) between 400 and 1550 nm was between 1.3360 and 1.3270. The material dispersion of poly(PFMMD) is superior to that of a commercial poly (1,1,2,4,4,5,5,6,7,7-decafluoro-3-oxa-1,6-heptadiene) (Cytop).

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Decarboxylation of fluorocarbonyl 4 was carried out also in anhydrous bis(2-ethoxyethyl) ether 18 (Scheme 2). A decomposition product was analyzed by GC-MS and 19 F NMR.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

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