Vinylidene fluoride and hexafluoropropylene

The commercially available materials are copolymers of vinylidene fluoride and hexafluoropropylene, and generally have a fluorine content in the range of 65-69% fluorine. 

Viton Copolymer of vinylidene fluoride and hexafluoropropylene DuPont... 

Viton A — trademark for a synthetic rubber derived from vinylidene fluoride and hexafluoropropylene... 

A study has been conducted on PBXs based on TATB using various binders such as polyurethane (Estane 5703-Goodrich), Viton-A (copolymer of vinylidene fluoride and hexafluoropropylene Du Pont), silicone resin (Chemlok), Kel-F800 [copolymer (3 1) of chlorotrifluoroethylene and vinylidene fluoride 3M Company] and Teflon [poly (tetrafluoroethylene), PTFE Du Pont] etc. and it was concluded that... 

Copolymer of styrene and acrylonitrile Copolymer of styrene and butadiene Natural rubber Chlorinated polyethylene Chlorosulfonated polyethylene Polyamides Polyesters Polyurethanes Polysulfones Polyacrylates Polyacrylamides Polydimethylsiloxane Copolymer of vinylidene fluoride and hexafluoropropylene... 

Footnotes (a) Gaskets are also available in other materials, such as hydrogenated nitrile, neoprene, butyl rubber, hypalon, silicon rubber to meet various application requirtnents. (b) Viton is a Du Pont Co. trademark for a series of fluoroelastorners based on the copolymer of vinylidene fluoride and hexafluoropropylene. 

Note ETFE, copolymer of ethylene and tetrafluoroethylene MFA, copolymer of perfluoromethylvi-nylether and tetrafluorethylene PFA, copolymer of perfluoropropylvinylether and tetrafluoroethylene FEP, fluorinated ethylene-propylene copolymer PCTFE, poly(chlorotrifluoroethylene) PVDF, poly(vinylidene fluoride) VDF-HFP, copolymer of vinylidene fluoride and hexafluoropropylene. 

Viton Ab vinylidene fluoride and hexafluoropropylene good good poor... 

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... 

Fluoropolymers (e.g., copolymers of vinylidene fluoride and hexafluoropropylene) and silicone-based (e.g., poly-dimethylsiloxanes) additives are often referred to as processing aids, preventing melt-fracture, for example, the so-called sharkskin. Fluoropolymers are applied in concentrations between 0.01% and 0.1%. 

The most important of the above products are the copolymers of vinylidene fluoride and hexafluoropropylene (VF2-HFP), as typified by the Du Pont product Viton A. The terpolymer of these two monmers together with tetrafluoroethylene (VF2-HFP-TFE) is also of importance (e.g., Du Pont product Viton B). This terpolymer is the best among oil-resistant rubbers in its resistance to heat aging, although its actual strengths are lower than for some other rubbers. The copolymers of vinylidene fluoride and chlorotrifluoroethylene (VF2-CTFE) are notable for their superior resistance to oxidizing acids such as fuming nitric acid. 

Vinylidene fluoride and hexafluoropropylene Ammonium persulphate Sodium bisulphate... 

We have developed gel electrolytes which consisted of block copolymer of vinylidene fluoride and hexafluoropropylene as the matrix resin with ethylene carbonate (EC)/ propylene carbonate (PC)/LiPFe as the electrolyte solution and it has been proved that they have sufficiently high ionic conductivity and high mechanical strength to realize the concepts listed above [9]. 

The copolymerization reactions of vinylidene fluoride and hexafluoropropylene were carried out in the presence of an organic mono-iodide compound, (CF3)2CFI, or di-iodide-compounds, I (CF2)4l, I(CF2)6l> as chain transfer agents and the following results were obtained. 

Piping from plastic tanks may be in aluminium, stainless steel or rigid PVC. Metallic pipework should be used where there exists any serious risk of physical damage. Some fluorinated plastics and rubbers can be used in service with H2O2, for example, polytetrafluorethylene, polyvinylidene fluoride, and a co-polymer of vinylidene fluoride and hexafluoropropylene such as VITON. 

Copolymerization of vinylidene fluoride and hexafluoropropylene (HFP) in an aqueous medium was reported in 1965.t l HFP content of the copolymer ranged from 1-13 mole%, depending on the composition of the reaction mixture and the polymerization conditions. The copolymers obtained at HFP content above 15 mole% were essentially amorphous and had low torsional modulus and high retention of rubbery properties over a wide temperature range without embrittlement. 

Table 5.40. Properties of Emulsion Copolymers of Vinylidene Fluoride and Hexafluoropropylene ]...

In order to manufacture a composite polymer electrolyte for a lithium secondary battery, a copolymer of vinylidene fluoride and hexafluoropropylene is casted with an conducting inorganic filler. 

A couple of papers have been concerned with fluorinated polymers. Twum and co-workers " made use of relaxation measurements (under high resolution conditions) along with other NMR techniques, to study end groups and branching structures of copolymers of vinylidene fluoride and hexafluoropropylene. In the paper mentioned above (Section 3.3), Kadayakkara et reported an investigation of relaxation... 

The second period from 50 to mid 70s might be the era of copolymers. Major improvements of processabilities or porperties of homopolymers like PTFE were attained in this period. The copolymers include FEP, ETFE and PFA which is a copolymer of TFE and perfluoropropyl vinyl ether. Another progress in this era is the commercial-ization of fluoroelastomers such the most popular elastomer as Viton, that is the copolymer of vinylidene fluoride and hexafluoropropylene or sometimes with TFE as a ter-monomer, which was followed by tetrafluoroethylene-based elastomers with propylene or perfluoromethyl vinyl ether comonomers. 

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