Poly trifluoropropylmethylsiloxane

Attenuated total reflection infrared critical micelle concentration electron spectroscopy for chemical analysis hydrophilic-lipophilic balance poly(chlorotrifluoroethylene) poly(dimethylsiloxane) poly(tetrafluoroethylene) poly(trifluoropropylmethylsiloxane) glass transition temperature critical surface tension of wetting Owens-Wendt solid surface tension surface tension of aqueous solution surface tension of liquid... 

Iliis paper descnbes a novel contact lens materim based on a methacrylate end capped poly (trifluoropropylmethylsiloxane)(TET), octafluoropentyl-methacrylate (OFPMA) and a wettmg agent 2-vinyl-4,4-dimethyl-2-oxazolin-5-one (VDMO). The trifluoropropylmethyl siloxane, fluorinated methacrylate methacrylate and VDMO in the correct concentration provide a lipid resistant, oxygen permeable, hydrophilic contact lens material. 

Surface tension studies of the most common fluorosilicone, poly(3,3,3-trifluoropropylmethylsiloxane) (PTFPMS), give unexpected results. Compared with (PDMS), PTFPMS has a higher liquid surface tension, a similar critical surface tension of wetting, and a considerably lower solid surface tension, as determined by water and methylene iodide contact angles and the method of Owens and Wendt (67). These results are summarized in Table X (7, 67, 72-74, 76, 77), in which PTFPMS is compared with two other fluorocarbon polymers, poly(tetrafluoroethylene) (PTFE) and poly(chlorotrifluoroethylene) (PCTFE). PTFE behaves like PTFPMS, whereas PCTFE behaves like PDMS. 

Synthesis of a DP 100 methacrylate end capped poly (65 mole % trifluoropropylmethylsiloxane)-co-(35 mole % dimethylsiloxane) (65-TFP) (Scheme 1)... 

Poly (p-toluenesulfonamide-co-formaldehyde). See Tosylamide/formaldehyde resin Polytrap 6603, Polytrap Q5-6603. See Acrylates copolymer Polytrifluorochloroethylene Poly (trifluoroethylene chloride) Poly (trifluoromonochloroethylene). See Chlorotrifluoroethylene polymer Poly (trifluoropropyl (methyl) siloxane Poly (3,3,3-trifluoropropylmethylsiloxane). See Polymethyl-3,3,3-trifluoropropylsiloxane Polytrifluoropropylmethylsiloxane, silanol-terminated. See Polymethyl-3,3,3-trifluoropropylsiloxane, silanol-terminated Poly(trifluorovinyl chloride). See Chlorotrifluoroethylene polymer Polytrimethylene terephthalate Synonyms PIT... 

The surface tension of fluorosiloxanes in the liquid state is measured directly and usually the values obtained are not affected by the measurement technique. The equilibrium surface tension in water is related to the liquid surface tension value. Siloxanes with trifluoropropyl groups are less effective in lowering the surface tension of water than the nonfluorinated poly(dimethyl) siloxanes. The surface tension of poly(3,3,3, trifluoropropylmethylsiloxane) is higher than that of the lower-cost dimethicones [poly(dimethylsiloxane)] [134,135]. Because of the high affinity of fluorine to silicon [136], fluorine atoms may be inclined to coordinate with silicone atoms. The distorted orientation may partially expose the hydrocarbon link of the pendant side chain. 

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