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首页> 外文期刊>RSC Advances >Synthesis of silicone elastomers containing trifluoropropyl groups and their use in dielectric elastomer transducers
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Synthesis of silicone elastomers containing trifluoropropyl groups and their use in dielectric elastomer transducers

机译：含三氟丙基的有机硅弹性体的合成及其在介电弹性体换能器中的应用

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摘要

Vinyl end-functionalized polysiloxanes P-x containing varying mol% of trifluoropropyl groups (x) were prepared starting from 1,3,5-tris(3,3,3-trifluoropropyl)-1,3,5-trimethylcyclotrisiloxane (F-3) and octamethylcyclotetrasiloxane (D-4) via anionic polymerization in the presence of tetramethylammonium hydroxide (TMAH) and 1,3-divinyl-1,1,3,3-tetramethyldisiloxane end-capping reagent. Their structures were determined by H-1 NMR spectroscopy and their molecular weights and distributions were measured by GPC. The various P-x were cross-linked in thin films via hydrosilylation of the vinyl groups with tetrakis(dimethylsiloxy) silane cross-linker in the presence of Karstedt catalyst. The mechanical, dielectric and electromechanical properties of the prepared films were investigated. An increase in the permittivity (epsilon') with increasing content of polar trifluoropropyl groups was observed with a maximum value of epsilon' = 6.4 for P-58(0). A maximum lateral actuation strain of 5.4% at an electric field as low as 7.8 V mu m(-1) was measured for a material prepared by cross-linking P-53.
机译：从1,3,5-三（3,3,3-三氟丙基）-1,3,5-三甲基环三硅氧烷（F-3）和八甲基环四硅氧烷（D-4）通过在四甲基氢氧化铵（TMAH）和1,3-二乙烯基-1,1,3,3-四甲基二硅氧烷封端剂的存在下进行阴离子聚合而形成。通过H-1 NMR光谱确定它们的结构，并且通过GPC测量它们的分子量和分布。在Karstedt催化剂的存在下，通过将乙烯基与四（二甲基甲硅烷氧基）硅烷交联剂进行氢化硅烷化，使各种P-x在薄膜中发生交联。研究了所制备薄膜的机械，介电和机电性能。对于P-58（0），观察到电容率（ε'）随极性三氟丙基基团含量的增加而增加，ε'的最大值为6.4。对于通过交联P-53制备的材料，在低至7.8 Vμm（-1）的电场下测得的最大横向驱动应变为5.4％。

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