Abstract In this work, polyphenolic extract from walnut green husks (denoted as walnut polyphenols), which is an abundant agroindustrial residue/waste, was used to modify barium titanate (BT) particles in the preparation of silicone rubber (SR) based dielectric elastomer (DE) composites with enhanced electromechanical performance. By employing walnut polyphenols modification, the dispersibility of BT particles in the SR matrix and the compatibility between BT and SR were greatly improved, which resulted in enhanced mechanical performance of the DE composites. Dielectric property measurement showed that DE composites containing walnut polyphenols modified BT particles (WNBT) had higher dielectric constants and lower dielectric losses than that of DEs with unmodified BT particles. Furthermore, it was found that the walnut polyphenols modification resulted in decreased dielectric loss tangent of the DE composites, suggesting an improved compatibility between the modified BT particles and SR. Finally, the static and dynamic electromechanical performance of the DE composites were evaluated. The SR/5% WNBT composite achieved the highest actuated area strain of 38% among the SR based composites used in this work. Moreover, the actuated area strain of SR/WNBT composites exhibited excellent electromechanical stability during the application of cyclic voltage signals.

中文翻译：

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使用硅橡胶和胡桃多酚改性介电粒子制备具有改进机电性能的介电弹性体

摘要 在这项工作中，核桃青壳的多酚提取物（表示为核桃多酚）是一种丰富的农业工业残留物/废物，用于改性钛酸钡（BT）颗粒，用于制备硅橡胶（SR）基介电弹性体（ DE) 具有增强机电性能的复合材料。通过采用核桃多酚改性，BT粒子在SR基体中的分散性和BT与SR的相容性得到极大改善，从而提高了DE复合材料的力学性能。介电性能测量表明，含有核桃多酚改性 BT 颗粒 (WNBT) 的 DE 复合材料比含有未改性 BT 颗粒的 DE 具有更高的介电常数和更低的介电损耗。此外，结果表明，核桃多酚改性导致 DE 复合材料的介电损耗角正切降低，表明改性 BT 颗粒与 SR 之间的相容性提高。最后，评估了DE复合材料的静态和动态机电性能。在这项工作中使用的基于 SR 的复合材料中，SR/5% WNBT 复合材料实现了 38% 的最高驱动面积应变。此外，SR/WNBT 复合材料的驱动面积应变在循环电压信号的应用过程中表现出优异的机电稳定性。在这项工作中使用的基于 SR 的复合材料中，SR/5% WNBT 复合材料实现了 38% 的最高驱动面积应变。此外，SR/WNBT 复合材料的驱动面积应变在循环电压信号的应用过程中表现出优异的机电稳定性。在这项工作中使用的基于 SR 的复合材料中，SR/5% WNBT 复合材料实现了 38% 的最高驱动面积应变。此外，SR/WNBT 复合材料的驱动面积应变在循环电压信号的应用过程中表现出优异的机电稳定性。