Highly Stretchable Poly(thiocarbonate)/Graphene Oxide Dielectric Composites toward a High Dielectric Constant and Low Dielectric Loss,ACS Applied Polymer Materials

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Highly Stretchable Poly(thiocarbonate)/Graphene Oxide Dielectric Composites toward a High Dielectric Constant and Low Dielectric Loss
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-06-15 , DOI: 10.1021/acsapm.1c00477
Zhanbin Feng _{1,

2} , Xing-Hong Zhang _{1,

2}

Affiliation

Dielectric elastomers (DEs) have attracted much attention due to their application prospects in biomimetic actuated devices, it is still a big challenge to prepare DEs with high dielectric constants (ε′) and low dielectric losses (tan δ). This work reports highly stretchable poly(propylene-monothiocarbonate)/graphene oxide (PPMTC/GO) dielectric composites with high ε′ and low tan δ via a simple solution-mixing process. The PPMTC with repeated thiocarbonate units enhances the interfacial polarizations with GO, leading to a high ε′ (up to 12). Meanwhile, the hydrogen bonding interactions of PPMTC and GO improve the dispersion of GO in the polymer matrix and thus decrease tan δ (∼0.07). Interestingly, the PPMTC/GO composites also possess excellent shape-memory performance, especially under large deformations (about 50%), with both the fixing ratio (R_f) and recovery ratio (R_r) more than 90%. In addition, the ultimate tensile strength is about 6.5 MPa for the neat PPMTC and over 7.0 MPa for its composites, and the elongation at break for all the samples is over 700%. Thus, it provides an alternative method to the fabrication of DEs.

中文翻译：

具有高介电常数和低介电损耗的高拉伸聚（硫代碳酸酯）/氧化石墨烯介电复合材料

介电弹性体（DEs）因其在仿生驱动装置中的应用前景而备受关注，但制备具有高介电常数（ε'）和低介电损耗（tanδ）的介电弹性体仍然是一个巨大的挑战。这项工作报告了通过简单的溶液混合过程具有高 ε' 和低 tan δ 的高度可拉伸的聚（丙烯-单硫代碳酸酯）/氧化石墨烯（PPMTC/GO）介电复合材料。具有重复硫代碳酸酯单元的 PPMTC 增强了与 GO 的界面极化，导致高 ε'（高达 12）。同时，PPMTC和GO的氢键相互作用改善了GO在聚合物基体中的分散，从而降低了tanδ（~0.07）。有趣的是，PPMTC/GO 复合材料还具有优异的形状记忆性能，尤其是在大变形（约 50%）下，具有固定比（R _f ) 和回收率 ( R _r ) 大于 90%。此外，纯 PPMTC 的极限拉伸强度约为 6.5 MPa，复合材料的极限拉伸强度超过 7.0 MPa，所有样品的断裂伸长率均超过 700%。因此，它为 DE 的制造提供了一种替代方法。

更新日期：2021-07-09

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