Fluorosilicone elastomer based on the poly[(3,3,3-trifluoropropyl)methylsiloxane-co-(3,3,4,4,5,5,6,6,6-nonafluorohexyl)methylsiloxane] was studied. First, the synthesis of fluorosilicone polymer based on the poly[(3,3,4,4,5,5,6,6,6-nonafluorohexyl)methylsiloxane] (PNFHMS) was examined by the polymerization of 1,3,5-tris(3,3,4,4,5,5,6,6,6-nonafluorohexyl)-1,3,5-trimethylcyclotrisiloxane (C4F9D3) by sodium hydroxide. On the contrast of the polymerization of the commercially available 1,3,5-tris(3,3,3-trifluoropropyl)-1,3,5-trimethylcyclotrisiloxane (CF3D3), the polymerization of C4F9D3 with sodium hydroxide resulted in the formation of 1,3,5,7-tetrakis(3,3,4,4,5,5,6,6,6-nonafluorohexyl)-1,3,­5,7-tetramethylcyclotetrasiloxane : [C4F9CH2CH2(CH3)SiO]4 (C4F9D4) as the major product. It was due to the easy occurrence of the depolymerization by the back-biting mechanism, because C4F9D4 is more stable ­than 1,3,5,7-tetrakis(3,3,3-trifluoropropyl)-1,3,5,7-tetramethylcyclotetrasiloxane : [CF3CH2CH2(CH3)SiO]4 (CF3D4). The above result made us to conclude that it was difficult to apply the polymer based on PNFHMS to heat vulcanizable elastomers and to investigate the elastomer based on the poly[(3,3,3-trifluoropropyl)methylsiloxane-co-(3,3,4,4,5,5,6,6,6-nonafluorohexyl)methylsiloxane]. C4F9D3 and CF3D3 were co-polymerized successfully by sodium hydroxide and formulated with the silica treated by CF3D3. The use of silica treated with methylsilyl unit failed, because creep-hardening phenomenon occurred. This elastomer was evaluated about some mechanical properties, and the resistance to organic solvents, and a fuel. The advantage that can be detected from the introduction of [C4F9C2H4-(CH3)SiO] unit was that the resistance to the polar solvents such as acetone and dimethylformamide was improved. Copyright © 2001 John Wiley & Sons, Ltd.

中文翻译：

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基于聚[(3,3,3-三氟丙基)甲基-硅氧烷-co-(3,3,4,4,5,5,6,6,6-九氟己基)甲基硅氧烷]的氟硅弹性体

研究了基于聚[(3,3,3-三氟丙基)甲基硅氧烷-co-(3,3,4,4,5,5,6,6,6-九氟己基)甲基硅氧烷]的氟硅弹性体。首先，基于聚[(3,3,4,4,5,5,6,6,6-九氟己基)甲基硅氧烷] (PNFHMS) 的氟硅氧烷聚合物的合成通过 1,3,5-三(3,3,4,4,5,5,6,6,6-九氟己基)-1,3,5-三甲基环三硅氧烷 (C4F9D3) 氢氧化钠。与市售的 1,3,5-三(3,3,3-三氟丙基)-1,3,5-三甲基环三硅氧烷 (CF3D3) 的聚合相比，C4F9D3 与氢氧化钠的聚合导致形成1,3,5,7-四(3,3,4,4,5,5,6,6,6-九氟己基)-1,3,5,7-四甲基环四硅氧烷 : [C4F9CH2CH2(CH3)SiO]4 ( C4F9D4) 作为主要产品。这是由于反咬机制容易发生解聚，因为C4F9D4比1,3,5,7-四(3,3,3-三氟丙基)-1,3,5,7-更稳定四甲基环四硅氧烷：[CF3CH2CH2(CH3)SiO]4(CF3D4)。上述结果使我们得出结论，将基于 PNFHMS 的聚合物应用于热硫化弹性体和研究基于聚[(3,3,3-三氟丙基)甲基硅氧烷-co-(3,3, 4,4,5,5,6,6,6-九氟己基）甲基硅氧烷]。C4F9D3和CF3D3通过氢氧化钠成功共聚并与CF3D3处理的二氧化硅配制而成。使用甲基甲硅烷基单元处理的二氧化硅失败，因为发生了蠕变硬化现象。对该弹性体的一些机械性能、对有机溶剂和燃料的耐受性进行了评估。引入[C4F9C2H4-(CH3)SiO]单元的优点是提高了对丙酮和二甲基甲酰胺等极性溶剂的耐受性。版权所有 © 2001 John Wiley & Sons, Ltd.