Hexa fluoropropylene

Tadic et al. studied the polymer poly-vynilidene fluoride/hexa-fluoropropylene ( PVdF/HFP ) containing lithium salt solution in Ethylene carbonate/diethylene carbonate ( EC/DEC )- In order to understand better the effect of anion size in the electrolyte, two Li salts were compared, namely LiN(CF3S02)2 (termed Liimide by the authors) and LiN(C2F5S02)2 (termed Libeti ). 

Explosive Composition PBXN-5. It consists of HMX 95 Viton (vinylidene fluoride hexa-fluoropropylene copolymer) 5%, and has a rate of deton of 8760m/sec at density 1.82g/cc. Its military requirements are given in Specification MIL-E-81111A, Explosive, Plastic-Bonded Molding Powder (Feb 1973)... 

The amorphous transition at 127° C is depressed to lower temperatures in copolymers of tetrafluoroethylene with up to 14 mole per cent hexa-fluoropropylene (McCrum, 1959b). For this reason it is attributed to longer sequences of CF2 groups. 

Whereas the electrochemical process of the production of propylene oxide has not advanced beyond the stage of experimental production, the electrosynthesis of hexa-fluoropropylene oxide 59 62) has been implemented industrially by Hoechst ... 

A combination of vinylidene fluoride (VDF) (in large quantity) with hexa-fluoropropylene (HEP)... 

Hydrolysis of acyl fluoride end groups on hexa-fluoropropylene-tetrafluoroethylene copolymer with 1% water in a corrosion-resistant 28-mm intermeshing twin-screw extruder at 360°C. 

Tetrafluorethylene reacts with SO3 to form a cyclic sultone. After rearrangement, the sultone can then be reacted with hexa-fluoropropylene epoxide to produce sulfonyl fluoride adducts, where... 

Synthesis of Perfluoro(4-Carbomethoxybutyl Vinyl Ether). The parent ester was prepared from perfluoroglutaryl fluoride and hexa-fluoropropylene oxide by the reactions shown in Figure 2. This ester had a boiling point of 146 °C, and showed characteristic vinyl ether infrared absorptions at 5.42/, 5.55/. (carbonyl group), and 10.0/. (-OCH3 group). 

Attempts to improve the hydrolytic stability of the FEB oligomers by extending the synthetic sequence described above to fluorocarbon ether dithiomldate esters (2) derived from hexa-fluoropropylene oxide were unsuccessful. The dithiolmidate esters proved to be unreactive in the methylene chloride-Freon 113 reaction medium. A search for a solvent in which the dithiolmidate ester was sufficiently reactive and the endcapping agent was stable was unsuccessful. 

FEP Tetrafluoroethylene-hexa-fluoropropylene rubber aldehyde resin... 

Chemical in Japan where membrane cells are now dominant. Because of their Teflon -like chemical composition, perfluorinated membranes resist chemical and thermal degradation better than any of the hydrocarbon ion-exchange membranes that preceded them. For most of them the starting materials are perfluorinated monomers such as tetrafluoroethylene (TFE) CF2=CF2 and hexa-fluoropropylene oxide (FIFPO)... 

X CF2CFCF2 X (X = copolymer chain) y-irr. of tetrafluoroethylene-hexa-fluoropropylene-copolymer at 300 K/ Solid polymer EPR/ 300 F a) 8.6 4F() ) 3.3 67Iwa4/ 67Siel... 

The first of these copolymers was with tetrafluoroethylene and hexa-fluoropropylene (FEP). Later, a copolymer of tetrafluoroethylene with small amounts of perfluoropropyl vinyl ether was made, and finally, an alternating copolymer of tetrafluoroethylene and ethylene was developed. All of these copolymers have similar properties to PTFE, but in contrast to the latter, they can be melt processed (see also Section 36.4). 

Copolymers. FEP is a copolymer of tetrafluoroethylene and hexa-fluoropropylene. It has properties similar to PTFE, but with a melt viscosity suitable for molding with conventional thermoplastic processing techniques. The improved processability is obtained by replacing one of the fluorine groups on PTFE with a trifluoromethyl group as shown in Fig. 1.7. ... 

T. Rager, Pre-irradiation of styrene/divinylbenzene onto poly(tetrafluoroethylene-co-hexa-fluoropropylene) from non-solvent, Helv. Chim. Acta 86, 1966 (2003). 

This fluoropolymer is a true thermoplastic and is a copolymer of tetrafluoroethylene and hexa-fluoropropylene. FEP can be heat sealed, heat bonded, laminated, and combined with many materials. It can be used by itself as a hot-melt adhesive. 

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