Ammonium perfluoro-octanoate

Figure 10. Adsorption isotherms for surfactants on a PTFE latex at 25°C (-%-) ammonium perfluoro-octanoate at pH 6.0 in 10 3 mol dm"3 ammonium nitrate (-O-) sodium dodecanoate at pH 9.0 in 10 3 mol dm"3 sodium nitrate.

Similar to other fluoropolymers and fluoroelasto-mers, such as PTFE, FEP, PFA, etc., low-level perfluorinated surfactants or chemicals, such as ammonium perfluoro-octanoate (APFO), etc. may be used in some fluoropolymer production as an emulsifier. These perfluorinated compounds are mostly extremely stable, degrade slowly, and therefore persist in the environment. These surfactants have varying ecotoxicity profiles, and users should contact their supplier for a more detailed ecotox information for their particular product.Industrial efforts are being made to reduce or even eliminate the use of such perfluorinated surfactants in their products and/or manufacturing processes. 

Copolymers from tetrafluoroethylene and 40% perfluorovinyl methyl ether are also elastomers (glass-transition temperature — 12°C). The copolymerization is carried out in aqueous emulsion with ammonium perfluoro-octanoate as emulsifier. Vulcanization is possible with hexamethylene diamine via the small amount of perfluoro(4-carboxy methyl butyl vinyl ether) also polymerized into the copolymer. This ether is produced from perfluoroglutaryl fluoride and hexafluoropropylene oxide. 

SYNS AMMONIUM PENTADECAFLUORO-OCTANATE AMMONIUM PERFLUORO-CAPRILATE AMMONIUM PERFLUORO-CAPRYLATE APFO FC-143 PERFLUORO-AMMONIUM OCTANOATE... 

The dynamics of mixtures of surfactants with proteins is of great importance for many practical processes, such as coating of photographic films, where gelatine in mixtures with surfactants and surface active dyes adsorb at the interface. Hempt et al. (1985) studied the relaxation behaviour of gelatine solutions in presence and absence of surfactants (SDS, tetradecyl dimethyl phosphine oxide, cetyltrimethyl ammonium bromide, n-decanoic acid, perfluoro octanoic acid tetraethyl ammonium salt). 

The polyacrylamide copolymers were prepared by dispersion of 2.0 g of acrylamide and varying amounts of comonomers in a 50 ml capped round bottomed flask containing 20.0 ml of deionized water, 4.0 ml acetone and 0.12-0.25 wt% surfactant (sodiumlauryl sulfate or potassium perfluoro-octanoate). After purging the solution with argon for 30 min, 0.50 ml of a solution of sodium metabisulfite (19.0 mg in 10.0 ml deionized water) and 0.50 ml of a solution of ammonium persulfate (22.8 mg in 10.0 ml deionized water) were injected into the rapidly stirred contents of the flask. Each polymerization was carried out for 24 h at 50 1.0°C. Gels of various... 

Perfluoroammonium octanoate. See Ammonium perfluorooctanoate (Perfluoro-n-butyl) methyl ether. See Methyl nonafluorobutyl ether Perfluorobutyric acid. See Heptafluorobutyric acid Perfluorocaprylic acid. See Perfluorooctanoic acid Perfluorocaprylic acid ammonium saK. See Ammonium perfluorooctanoate Perfluoroctanoic acid. See Perfluorooctanoic acid Perfluoroethylene propylene. See Fluorinated ethylene/propylene Perfluoroheptane... 

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