Fluorosilicon acid

Gas Chromatographic Columns. Two heat-resistant glass columns, A and B, % inch nominal o.d. (1.5 mm. i.d., 3 mm. o.d.) and 5 feet long, are used. Column A is packed with 60-70 mesh acid-washed Chromosorb G, coated by weight with 0.15% Carbowax 20M (a polyethylene glycol) and with 1.5% DC 200 (12,500 centistokes) silicone fluid Column B is packed with 60-70 mesh acid-washed Chromosorb G, coated by weight with 0.10% Carbowax 20M and with 1.0% QF-1 fluorosilicone (also called FS 1265). 

Silicone 600 Excellent heat resistance. Fair water resistance poor resistance to steam at high pressures. Fair to good acid, alkali resistance. Poor (except fluorosilicone rubber) resistance to oils, solvents. 

Fluorosilicone, dimethylsilicone homopolymers, as well as their copolymers, are negatively charged and inhibit the blood clotting reaction. There are a number of polyelectrolytes which have negative zeta potentials and are antithrombogenic. The most promising is the ethylene-acrylic acid copolymer, neutralized to the extent of 60% with sodium ions. Another useful and related material is the vinyl acetate-crotonic acid copolymer. 

The fluorosilicone rubbers have better chemical resistance than the silicone rubbers. They have excellent resistance to aliphatic hydrocarbons and good resistance to aromatic hydrocarbons, oil and gasoline, animal and vegetable oils, dilute acids and alkalies, and alcohols and fair resistance to concentrated alkalies. 

Chem. Descrip. Fluorosilicone-contg. defoamer in cyclohexanone soiv. Uses Defoamer for spray and brush applies, of soiv.-borne wood coatings (polyurethane coatings, acid-curing coatings, NC lacquers) Properties Colorless clear Iiq. dens. 0.94-0.96 cm (20 C) flash pf. 42 C ref. index 1.445-1.455... 

Silicone and butadiene/acrylonitrile elastomers have been successfully incorporated into an addition polyimide adhesive LARC-13. Two approaches were used to accomplish this task. Fluorosilicone (Silastic) and vinyl-terminated (Sylgard) silicone rubbers were physically blended into the adhesive amic acid and aromatic ATBN and aromatic amine-terminated silicone elastomers were chemically reacted into the prepolymer backbone. Each of the four resins displayed a distinct and separate Tg for the resin and elastomer phases. Incorporation of elastomer particles at a concentration of 15% by weight solids resulted in a 6- to 7-fold increase in peel strength and a 3- to 5-fold increase in the fracture toughness of LARC-13. This improvement in toughness was accomplished at a sacrifice in the elevated temperature adhesive strength of the material. 

The reactivity of cyclosiloxane with the 3,3,4,4,5,5, 6,6,6-nonafluorohexyl group and its application to fluorosilicone synthesis was carefully studied by Furukawa et al. [27]. In contrast to polymerization of commercially available l,3,5-tra(3,3,3-trifluoropropyl)-1,3,5-trimethylcyclotrisiloxane (CF3-D3), polymerization of l,3,5-tra(3,3,4,4,5,5,6,6,6-nonafluorohexyl)- 1,3,5 -trimethylcyclotrisiloxane (C4F9-D3) with sodium hydroxide yielded 1,3,5,7-tetrakis(3,3,4,4,5,5,6,6,6-nonafluorohexyl)-l,3,5,7-tetramethylcyclotetrasiloxane [C4F9CH2CH2(CH3) SiO]4 (C4F9-D4) as the major product. On the other hand, it was reported that polymerization of C4F9-D3 with trifluoromethanesulfonic acid proceeded in... 

Topics involving functionalized polymers that were covered at the symposium include fluorosilicones (48,50,55) (Narayan-Saratahy), amino acid functionalizations (Matisons), grafts (Priou), hydrosilation reactions (Hu), chain-end functionalizations (Fu, Brzezinska, Miranda), and siloxanes as branches (lUshimoto) (26). 

Carbonated aromatic sulfonic acid or a salt Fluorosilicone oil or other modified silicone oil [45]... 

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