Poly hexafluoropropylene

Mention has already been made of the effectiveness of corona or plasma treatment in increasing the influence of subsequent or concurrent polymer treatment. As examples of polymers used in this way, mention can be made of reactive cationic polysiloxane [294] and polymerisation on the fibre of tetrafluoroethylene or hexafluoropropylene [299]. Water repellency was also improved by the fluorinated polymers. Tetrafluoroethylene gave superior shrink resistance this polymer covered the scale edges of the wool, whereas this did not occur with poly(hexafluoropropylene). 

Figure 23 shows a biphasic toluene/perfluoro-2-butyltetrahydrofuran (Fluoro-inert FC-75) mixture containing dendrimer-encapsulated Pd nanoparticles complexed with poly(hexafluoropropylene oxide-co-difluoromethylene oxide) monocarboxylic acid prepared via the type of electrostatic modification de-... 

Fig. 23. This photograph shows a two-phase system consisting of (top phase) toluene and (bottom phase) perfluoro-2-butyltetrahydrofuran (Fluoroinert FC-75).The dark color (brown) in the bottom phase indicates that the dendrimer-encapsulated Pd nanoparticles, complexed with poly (hexafluoropropylene oxide-co-difluoromethylene oxide) monocarboxylic acid, are selectively extracted into the fluorous phase. No detectable color was observed in the organic phase. Reprinted with permission from Ref. 103 Copyright 2000 American Chemical Society...

Sodium poly(hexafluoropropylene oxide) carboxylate/water/COj (4)... 

Three distinct regions can be seen in the TGA profile. They correspond to complex processes. The HF elimination alone cannot account for 62 % weight loss. The content of HF by weight in the homopolymer poly(vinylidene fluoride) is about 52.5%, and the loss seen in the TGA would indicate no poly(hexafluoropropylene). However, this is not the case. 

Figure 9.1.20. Result for a Py-GC/MS analysis of poly(hexafluoropropylene oxide). Pyrolysis done on 0.4 mg material at 85(f C in He, with the separation on a Carbowax type column.

Given the work by lezzi and Consani, Hoefling et al. investigated how the incorporation of fiuoroether functional groups into polymers and surfactants enhanced solubility in CO2 (13). The polymer poly(hexafluoropro-pylene oxide) displayed high miscibility in CO2 (MW 13,000 soluble up to 10 wt % polymer in CO2 at 295 K and approximately 17 MPa). Furthermore, those surfactants that incorporated fiuoroether functionalities, hydroxyalu-minum bis[poly(hexafluoropropylene oxide) carboxylate], poly(hexafiuoro-propylene oxide) carboxylic acid, and sodium poly(hexafluoropropylene oxide) carboxylate, exhibited complete miscibility in CO2 at pressures less than 20 MPa. 

Ammonium poly(hexafluoropropylene oxide) carboxylic acid 120 (48)... 

Figure 12-4. Determination of the cosine of the contact angle d on the interfacial surface tension 7/v of the liquid used on different substrates in contact with air (20° C). PE, poly(ethylene) PTFE, poly(tetrafluorethylene) PEP, poly(hexafluoropropylene) FLA, perfluorolauric acid (mono-molecular layer on platinum). (After R. C. Bowers and W. A. Zisman.)...

Acrylamide was successfully polymerized in a supercritical inverse emulsion composed of an ethane-propane mixture as the continuous phase, water and acrylamide as the dispersed phase, and a mixed nonionic surfactant system as the emulsifier [86], AIBN [2,2 -azobis(isobutyronitrile)] was the initiator. The polymerization was subsequently repeated in supercritical CO2 [87]. The C02-philic surfactant used to produce the inverse emulsion was an amide, end-capped poly(hexafluoropropylene oxide). The process yielded polymers of average molecular weights from 5 x 10 to 7 x 10. ... 

Atkinson, P. Fleming, R. (1976). Origin of absorption and resorption currents in the copolymer poly(hexafluoropropylene-tetrafluoroethylene). Journal Phys. D Appl. Phys., Vol.9, pp. 2027-2040... 

Methylene chloride Perfluorohexane Perfluoropentane Poly (hexafluoropropylene) oxide Tetrahydronaphthalene Trichloroethylene... 

PPE with poly (hexafluoropropylene-co-vinylidene fluoride) Thermoformable, high HDT, and flame resistance Snodgrass and Lauchlan 1972... 

Poly(hexafluoropropylene-co-vinylidene fluoride) n. 1,1,2,3,3,3-hexafluoro-l-propene-co-l,l-difluoroethene a fully fluorinated polymer based on gas CF3 CF=CF2, not commercial. However, the co-polymers of hexafluoropropylene and tetrafluoroethylene make up the family of fluorinated ethylene propylene resins (See image). 

Peifluoropolyethers Similarly to fluorinated olefins, the introduction of fluorine atoms onto the poly(ethylene oxide) (PEO) backbone has been explored through the family of perfluoropolyethers (sometimes coined perfluoroalkylethers or perfluoropolyalkylethers). Functionalized poly(hexafluoropropylene oxides) are representative perfluoropolyethers that actually attracted early attention for their solubility in SC-CO2 (see Figure 13.5). These polymers are produced by anionic ringopening polymerization of HFP oxide and commercialized as industrial lubricants by Dupont under the name of Krytox . 

FIGURE 13.18 Molecular structure of poly(hexafluoropropylene oxide)-Z>/ucfc-poly(lactide)... 

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