Danish Polymer Center, Department of Chemical and Biochemical Engineering, Technical University of Denmark, Søltofts Plads, Building 227, 2800 Kgs. Lyngby, Denmark.
Bioinspir Biomim. 2021 Feb 15;16(2). doi: 10.1088/1748-3190/abdd9f.
Slide-ring elastomers have garnered a lot of interest for their potential use in dielectric elastomer actuators due to their intrinsically soft nature and high elasticity. However, the use of sliding cross-linkers has been constrained by their low miscibility with commonly used elastomer precursors and the specialized curing chemistries that are necessary for incorporating them into networks. Here, we have presented a method to produce vinyl functional polyrotaxane cross-linkers that are compatible with polysiloxanes and can be processed by industrially scalable methods. The sliding silicone films that were fabricated with these novel cross-linkers were highly extensible (>350%) and did not exhibit strain hardening even at high elongation. The composite films also retained the favorable dielectric properties of silicone elastomers such as the characteristic low dielectric loss. The modified polyrotaxanes present a robust platform for producing a new class of sliding silicone elastomers with well-defined networks structures.
滑环弹性体由于其固有的柔软性和高弹性，在介电弹性体致动器中有很大的应用潜力。然而，滑动交联剂的使用受到其与常用弹性体前体低混溶性以及将其纳入网络所需的特殊固化化学的限制。在这里，我们提出了一种生产与聚硅氧烷相容的乙烯基官能聚轮烷交联剂的方法，并且可以通过工业上可扩展的方法进行处理。用这些新型交联剂制备的滑动硅橡胶薄膜具有很高的拉伸性（>350%），即使在高伸长率下也没有表现出应变硬化。复合薄膜还保留了硅橡胶弹性体的有利介电性能，例如特征低介电损耗。改性聚轮烷为制备具有明确定义的网络结构的新型滑动硅橡胶弹性体提供了一个强大的平台。
