Abstract Silicone rubber (SR) composites exhibited significantly improved electromechanical properties via tuning the molecular flexibility by adding plasticizer. To decrease the enhanced elastic modulus of SR composites filled with high-dielectric-constant BaTiO3 (BT) particles, silicone oil (SO) plasticizer was incorporated into the BT/SR composite to weaken the intermolecular interactions and break the structure of the filler network as result of swelling effect. The obviously decreased elastic modulus resulted in a high electromechanical sensitivity β and a relatively large actuated strain of 10.6% for 20 phr BT/SR composite filled with 50 phr SO at a low electric field of 25 kV/mm, approximately 380% increase compared to that of pure SR at the same electric field. The result indicates that tuning flexibility of composites is a good strategy to obtain high-performance dielectric elastomers.

中文翻译：

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通过调节分子柔韧性改善有机硅介电弹性体复合材料的机电性能

摘要 硅橡胶 (SR) 复合材料通过添加增塑剂调节分子柔韧性，显着改善了机电性能。为了降低填充高介电常数 BaTiO3 (BT) 颗粒的 SR 复合材料的增强弹性模量，在 BT/SR 复合材料中加入硅油 (SO) 增塑剂以削弱分子间相互作用并破坏填料网络的结构，如膨胀效应的结果。在 25 kV/mm 的低电场下，填充 50 phr SO2 的 20 phr BT/SR 复合材料明显降低的弹性模量导致较高的机电灵敏度 β 和 10.6% 的较大致动应变，与相比增加了约 380%。相同电场下纯 SR 的情况。