Fluorosilicone Rubber

Reactivity of cyclosiloxane with 3,3,4,4,5,5,6,6,6‐nonafluorohexyl group and its application to fluorosilicone synthesis

“…6 When C 4 F 9 -D3 was subjected to the polymerization under the same conditions, the complete consumption of C 4 F 9 -D3 was observed by gas chromatography; however, no polymer was obtained, in contrast to the polymerization for CF 3 -D3. The analysis of the reaction mixture by gas chromatography showed that 1,3,5,7-tetrakis(3,3,4,4,5,5,6,6,6-nonafluorohexyl)-1,3, 5,7-tetramethylcyclotetrasiloxane {[C 4 F 9 CH 2 CH 2 -(CH 3 )SiO] 4 (C 4 F 9 -D4)} was formed as the major product (74.3%).…”

“…Actually, our experiments suggested that the 3,3,4,4,5,5,6,6,6-nonafluorohexyl group (C 4 F 9 C 2 H 4 -) was the longest fluoroalkyl group employed in this method. Poly (3,3,4,4,5,5,6,6,6-nonafluorohexylmethylsiloxane) (PNFHMS) was synthesized by the ring opening polymerization of 1,3,5-tris (3,3,4,4,5,5,6,6,6-nonafluorohexyl)-1,3,5-trimethylcyclotrisiloxane (C 4 F 9 -D3) and studied from the viewpoint of its surface tension. 4 However, the reactivity of C 4 F 9 -D3 remained unknown and the copolymerization between C 4 F 9 -D3 and cyclodimethylsiloxane was not investigated.…”

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ABSTRACT:The reactivity of cyclosiloxane with 3,3,4,4,5,5,6,6,6-nonafluorohexyl group and its application to fluorosilicone synthesis were studied. In contrast to the polymerization of the commercially available 1,3,5-tris(3,3,3-trifluoropropyl)-1,3,5-trimethylcyclotrisiloxane (CF 3 -D3), the polymerization of 1, 3,5-tris(3,3,4,4,5,5,6,6,6-nonafluorohexyl)-1,3,5-trimethylcyclotrisiloxane (C 4 F 9 -D3) with sodium hydroxide yielded 1, 3,5,7-tetrakis(3,3,4,4,5,5,6,6,6-nonafluorohexyl)-1,3,5,7-tetramethylcyclotetrasiloxane {[C 4 F 9 CH 2 CH 2 (CH 3 )SiO] 4 (C 4 F 9 -D4)} as the major product, which was the result of the depolymerization by a backbiting mechanism.

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Preparation and properties of fluorosilicone and fluorosilicone elastomer with various contents of trifluoropropyl groups

“…Especially the fluorosilicone elastomers based on fluorosilicone take advantages of the properties of the fluoropolymers, which include the low-surface-tension property, oil resistance and solvent resistance [1][2][3][4]. They can be widely used in many fields, such as automobile, airplane, astronavigation, petrochemical, machinery and artificial organ [5][6][7][8][9].…”

“…Pierce etc reported the synthesis of the polymers and the application of them [6]. Cypryk etc reported a kinetic study of copolymerization of 2,4,6-tris(trifluoro-propyl)-2,4,6-trimethylcyclotrisiloxane with hexamethylcyclotrisiloxane using the BuLi/THF initiation system, and some physical properties of the resulting gradient copolymers [10].…”