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Provided is a method of producing perfluoro(2-methylene-4-methyl-1,3-dioxolane), the method including at least following processes (1) to (3): (1) reacting at least one of perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane) and a hydrolysis product there
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- FLUOROLACTONE AND METHOD FOR PRODUCING SAME
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The present disclosure provides, for example, a method that can produce a fluorolactone compound from hexafluoropropylene oxide or the like in a single step. The present disclosure relates to a method for producing a compound represented by formula (1): wherein two R1 are the same and each is a fluorine atom or a fluoroalkyl group, the method comprising step A of reacting a compound represented by formula (2): wherein R1 is as defined above, with a compound (3) represented by formula (3-1) or the like: wherein R31, R32, and R33 are the same or different and each is a hydrogen atom or a C1-10 alkyl group, or two of them are optionally linked to each other to form a ring optionally having one or more substituents, in the presence of a fluorine compound (4) represented by formula (4-1) or the like: [in-line-formulae]MHnFm(4-1)[/in-line-formulae] wherein M is a metal atom, n is 0 or 1, and the sum of the valence number of M and n is m, and an organic solvent, provided that the compound represented by formula (3) is excluded from the organic solvent.
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Paragraph 0298-0302
(2021/12/03)
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- Mechanical, optical and gas transport properties of poly(perfluoro-2-methylene-4-methyl-1,3-dioxolane) membrane containing perfluoropolyether as a plasticizer
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To improve the flexibility of poly(perfluoro-2-methylene-4-methyl-1,3-dioxolane), perfluoropolyether was added as a plasticizer to the dioxolane polymer. The glass transition temperature (Tg) of the polymer/plasticizer blend is in the range of 125–130 °C, which is slightly lower compared to that of pure dioxolane polymer due to the addition of perfluoropolyether. The blended polymers have low refractive index (1.328–1.333) and exhibited extraordinary optical transmittance within the visible and near-infrared regions. Stress–strain curves of polymer blend films were obtained, and tensile strength as well as Young's modulus were calculated. Film flexibility and elongation were improved significantly by the addition of the perfluoropolyether. These enhanced mechanical properties could be beneficial for potential applications of the perfluoropolymers such as plastic optical fibers and gas separation membranes. Membranes made from the perfluoropolymer/plasticizer blends show increased permeances for gases (CH4, N2, H2, CO2) and slightly reduced gas selectivities as the amount of perfluoropolyether is increased.
- Chiang, Hao-Chun,Fang, Minfeng,Okamoto, Yoshiyuki
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- Synthesis and characterization of an amorphous perfluoropolymer: Poly(perfluoro-2-methylene-4-methyl-1,3-dioxolane)
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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-ferf-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 ring-opening 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 polyd,1,2,4,4,5,5,6,7,7-decafluoro-3-oxa-l,6- heptadiene) (Cytop).
- Mikes, Frantisek,Yang, Yu,Teraoka, Iwao,Ishigure, Takaaki,Koike, Yasuhiro,Okamoto, Yoshiyuki
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p. 4237 - 4245
(2007/10/03)
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- METHOD FOR FLUORINATED COMPOUNDS, FLUORINATED COMPOUNDS PRODUCED BY THE METHOD, FLUORINATED POLYMERS OF THE FLUORINATED COMPOUNDS, AND OPTICAL OR ELECTRICAL MATERIALS USING THE POLYMERS
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A production method of fluorinated compounds, for producing a compound represented by formula (3) in a fluorine-based solution in a flow of fluorine gas after reaction of at least one type of compounds represented by formula (1) and at least one type of compounds represented by formula (2). Similarly, fluorinated compounds represented by formula (4) prepared by the fluorination of compounds obtained by the reaction of formula (1) and formula (2)'. The fluorinated polymers obtained by the polymerizations of formula (3) and (4) compounds are useful as an optical or electrical materials.
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Page/Page column 17
(2010/02/11)
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