Fluorosilicones synthesis

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... 

Figure 5.2. Synthesis of fluorosilicones by condensation of bis-chlorosilane (4) and disilanol (5).

FIGURE 3.68 Synthesis of 4-fluoropyrazoles using organo(per)fluorosilicon building... 

So, we were interested in reproducing the synthesis of one of these products [57] to compare its thermal properties to those of the hybrid fluorosilicones that we had previously described. The synthesis was performed according to the following scheme ... 

Conrad, M. P. C. Shoichet, M. S., Synthesis and Thermal Stability of Hybrid Fluorosilicone Polymers. Polymer 2007,48, 5233-5240. 

Patwardhan, D. V. Zimmer, H. Mark, J. E., Synthesis and Surface Properties of Polybutadiene Chains End-Capped with Two Types of Fluorosilicon Groups. J. Macromol. Set, Chem. 1998, ASS, 1941-1955. 

Guan, C.-M. Luo, Z.-H. Qiu, J.-J. Tang, P.-P., Novel Fluorosilicone Triblock Copolymers Prepared by Two-Step RAFT Polymerization Synthesis, Characterization, and Surface Properties. Eur. Polym. J. 2010, 46,1582-1593. 

Fluorosilicones and Other Fluoropolymers Synthesis, Properties, and Appiications... 

Scheme 6.7 Synthesis of fluorosilicones with long chain fluoroalkyloxypropyl group substitution. Taken from Ref. [28],...

Fluorosilicones and Other FluoropolyMERS Synthesis, Properties, and Applications... 

Kim et al. [46,47] reported the synthesis of fluorosilicone block copolymers of poly(perfluoroalkylethyl acrylate)-fc-poly(3-[m s(trimethylsilyloxy)-silyl] propyl methacrylates) (PFA-i>-PSiMAs) by a three-step synthetic approach. In the first step, a PFA macromonomer (PFAM) was made by free radical polymerization. Thereafter, a condensation reaction was applied to prepare the PFAM initiator (PFAMI). Finally, the PFAMI and SiMA were reacted to prepare the PFA-i>-PSiMAs block copolymers. In early studies, synthesis of fluorosilicone block copolymers was reported by Boutevin et al. [48-50]. However, two-step hydrosilylation was carried out to prepare the photo-cross-linkahle fluorinated PDMS as reported by Boutevin et al. [48]. In another study, Luo et al. [51] prepared poly(dimethylsiloxane)- -poly(2,2,3,3, 4,4,4-heptafluorobutyl methacrylate- -poly(styrene)... 

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