Hexafluoropropylene copolymers

S. V. Gangal, "Tetrafluoroethylene Polymers, Tetrafluoroethylene—Hexafluoropropylene Copolymers," inj. I. Kroschwitz, ed., Enjclopedia of Polymer S cience and Engineering 2nd ed., Vol. 16, John Wiley Sons, Inc., New York, 1989, pp. 601—613. 

The inability to process PTFE by conventional thermoplastics techniques has nevertheless led to an extensive search for a melt-processable polymer but with similar chemical, electrical, non-stick and low-friction properties. This has resulted in several useful materials being marketed, including tetrafluoro-ethylene-hexafluoropropylene copolymer, poly(vinylidene fluoride) (Figure 13.1(d)), and, most promisingly, the copolymer of tetrafluoroethylene and perfluoropropyl vinyl ether. Other fluorine-containing plastics include poly(vinyl fluoride) and polymers and copolymers based on CTFE. 

Ionic liquids have already been demonstrated to be effective membrane materials for gas separation when supported within a porous polymer support. However, supported ionic liquid membranes offer another versatile approach by which to perform two-phase catalysis. This technology combines some of the advantages of the ionic liquid as a catalyst solvent with the ruggedness of the ionic liquid-polymer gels. Transition metal complexes based on palladium or rhodium have been incorporated into gas-permeable polymer gels composed of [BMIM][PFg] and poly(vinyli-dene fluoride)-hexafluoropropylene copolymer and have been used to investigate the hydrogenation of propene [21]. 

Note LX-Q4-1 consists of HMX 85 Viton A (Vinylidene fluoride hexafluoropropylene copolymer) 14%. PBX 9404 HMX 94, NC 3 CEF (Tris-/3-chloroethylphosphate) 3%-PBX 9011 HMX 90 Estane (Polyester urethane of adipic acid 1,4-butanediol-diphenylmethane diisocyanate) 10%. RX-08 AZ HMX 80, FEFO (Fluorodinitro-ethyl formal) 13—16 Polyester 3—6%... 

FEP tetraethylene/hexafluoropropylene copolymer. Supplier. Fluorocarbon-Bunnel Plastics Division, Penntube Products, Mickleton, NJ. 

D. Fluorocarbon Polymers. Four different fluorocarbons account for the bulk of the laboratory applications polytetrafluoroethylene, Teflon PTFE po-ly(chlorotrifluoroethylene), KEL-F tetrafluoroethylene-hexafluoropropylene copolymer, Teflon FEP and tetrafluoroethylene-perfluorovinyl ether copolymer, PFA. These polymers are inert with most chemicals and solvents at room temperature and exceptionally inert with oxidizing agents. They also have an exceptional resistance to temperature extremes. However, they are decomposed by liquid alkali metals, solutions of these metals in liquid ammonia, and carban-ion reagents such as butyllithium. Teflon retains some of its compliance at liquid hydrogen temperature. The maximum temperature which is recommended for continuous service is 260°C for Teflon PTFE and PFA, and about 200°C for Kel-F and Teflon FEP. 

C4C1im][PF6] Pd/C Catalytic membrane poly(vinylidene fluo-ride)-hexafluoropropylene copolymer as support. [81]... 

Estane 5702-Fl Viton A BDNPA-F Polyurethane solution system Vinylidine fluoride/hexafluoropropylene copolymer, 60/40 wt % Bis(2,2-dinitropropyl)acetal/bis(2,2-dinitropropyl) formal, 50/50 wt % Tris- -chlorethylphosphate Chlorotrifluoroethylene/vinylidine fluoride copolymer, 3 1 Vinyl chloride/chlorotrifluoroethylene copolymer, 1.5 1 Styrene polymer, 100% Di(2-ethylhexyl)phthalate Bis(2-fluoro-2,2-dinitroethyl)foimal... 

Trademark of duPont Company for Vinylidene fluoride hexafluoropropylene copolymer... 

Many approaches have been developed for the production of ionic liquid-polymer composite membranes. For example, Doyle et al. [165] prepared RTILs/PFSA composite membranes by swelling the Nafion with ionic liquids. When 1-butyl, 3-methyl imidazolium trifluoromethane sulfonate was used as the ionic liquid, the ionic conductivity ofthe composite membrane exceeded 0.1 S cm at 180 °C. A comparison between the ionic liquid-swollen membrane and the liquid itself indicated substantial proton mobility in these composites. Fuller et al. [166] prepared ionic liquid-polymer gel electrolytes by blending hydrophilic RTILs into a poly(vinylidene fiuoridej-hexafluoropropylene copolymer [PVdF(HFP)] matrix. The gel electrolytes prepared with an ionic liquid PVdF(HFP) mass ratio of 2 1 exhibited ionic conductivities >10 Scm at room temperature, and >10 Scm at 100 °C. When Noda and Watanabe [167] investigated the in situ polymerization of vinyl monomers in the RTILs, they produced suitable vinyl monomers that provided transparent, mechanically strong and highly conductive polymer electrolyte films. As an example, a 2-hydroxyethyl methacrylate network polymer in which BPBF4 was dissolved exhibited an ionic conductivity of 10 S cm at 30 °C. 

Copolymer of vinylidene fluoride and hexafluoropropylene Copolymer of vinylidene fluoride and chlorotrifluoroethylene... 

Vinylidene Fluoride Hexafluoropropylene Copolymer - Thermoplastic copolymer of vinylidene fluoride and hexafluoropropylene. Has better thermal stability, antistick, dielectric, and antifriction properties, and chemical resistance, but lower mechanical strength at room temperature and creep resistance, compared to incompletely fluorinated fluoropolymers. Processing by conventional thermoplastic techniques is difficult due to its high melt viscosity. Uses include chemical apparatus, containers, films, and coatings. Also called TAM... 

The membrane was prepared by mixing [BMIM][PF5 with the catalysts and poly(vinylidene fluoride)-hexafluoropropylene copolymer in 4-methylpentan-2-one, followed by heating and evaporation of the 4-methylpentan-2-one. The restdting membrane was placed in a membrane reactor and used to hydrogenate propene to propane with conversions of up to 70%. 

HUT Hutchenson, K.W., Henry s law coefficients for monomers and selected solvents in amorphous tetrafluoroethylene-hexafluoropropylene copolymers, J. Chem. Eng. Data, 48, 1028, 2003. 

MEK Mekhilef, N., Viscoelastic and pressure-volume-temperature properties of poly(vinylidene fluoride) and poly(vinylidene fluoride)-hexafluoropropylene copolymers (experimental data by N. Mekhilef), 7. Appl. Polym. Sci., 80,230,2001. 

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