Dynamic Crosslinked Silicones and their Composites: A Review

Juan Ye1

Hao Jin1

Zhaoji Zu1

Bing Yu1

Hongping Xiang1,Email

Mingqiu Zhang2,Email

1Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, PR China.
2Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, GD HPPC Lab, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China.

Abstract

The introduction of diverse dynamic bonds into the polysiloxane crosslinked networks can form dynamic crosslinked silicones and their composites, which not only maintain the good physicochemical performance of polysiloxane, but also exhibit novel self-healability and reprocessability. They have shown broad application prospects in smart coatings, sensors and flexible devices. However, the trade-off between excellent dynamic behavior and high mechanical property is challenging their practical applications. To improve this situation, recent advances that highlight the molecular structure design, property modulation and potential application of dynamic crosslinked silicones and their composites with self-healing and reprocessing abilities are reviewed herein. Firstly, self-healing silicones are discussed according to their dynamic crosslinked network that is transforming from single dynamic bond to multiple dynamic bonds to optimize mechanical property and self-healing efficiency. Next, the recycling or reprocessing of dynamic crosslinked silicones are also reviewed in accordance with their reprocessing methods to meet special requirements from different fields. Then, dynamic crosslinked silicone composites are discussed in terms of kinds of nanofillers to further enhance properties and broaden functionalities. What is more, the promising prospects and facing challenges of dynamic crosslinked silicones and their composites are also proposed to achieve an early realization of commercial applications. 

Dynamic Crosslinked Silicones and their Composites: A Review