中科院化学所赵宁团队开发了超硬但快速可逆的Si–O–Si网络，可实现透明、自愈、坚固和可编程多功能纳米复合涂层的可扩展制造。相关研究成果发表在2021年12月29日出版的《美国化学会杂志》。

急需一种基于应用要求的可编程多功能涂层。然而，制备具有快速自愈能力的又硬又柔韧的涂层仍然是一个挑战。

该文中，研究人员开发了一种由氨基丙基功能化聚倍半硅氧烷和三乙胺（TEA）制备的硬而可逆的Si–O–Si网络。在该硅-氧-硅网络的基础上，通过将软聚合物胶束填充到硬聚倍半硅氧烷网络中，可以制备具有优异透明度、硬度、柔韧性和快速自愈性能的碱性涂层。高度交联的连续网络赋予涂层比大多数聚合物（H<0.3 GPa）更高的硬度（H=0.83 GPa），而均匀分散的胶束将杨氏模量（E=5.89 GPa）降低到与普通塑料一样低的值，从而产生优异的硬度和柔韧性，H/E为14.1%，弹性恢复率（We）为86.3%。涂层上的划痕（～50μm）可在4分钟内愈合。聚倍半硅氧烷网络的混合组成在与其他功能部件集成，以实现可编程多功能性而不降低基本性能方面也显示出巨大的优势。

该纳米复合材料的设计为制备具有优异综合功能的材料提供了一条途径，而无需在这些性能之间进行权衡。

附：英文原文

Title: Superior Hard but Quickly Reversible Si–O–Si Network Enables Scalable Fabrication of Transparent, Self-Healing, Robust, and Programmable Multifunctional Nanocomposite Coatings

Author: Yi Hou, Guangda Zhu, Jie Cui, Ningning Wu, Bintao Zhao, Jian Xu, Ning Zhao

Issue&Volume: December 29, 2021

Abstract: A coating with programmable multifunctionality based on application requirements is desirable. However, it is still a challenge to prepare a hard and flexible coating with a quick self-healing ability. Here, a hard but reversible Si–O–Si network enabled by aminopropyl-functionalized poly(silsesquioxane) and triethylamine (TEA) was developed. On the basis of this Si–O–Si network, basic coatings with excellent transparency, hardness, flexibility, and quick self-healing properties can be prepared by filling soft polymeric micelles into hard poly(silsesquioxane) networks. The highly cross-linked continuous network endows the coating with a hardness (H = 0.83 GPa) higher than those of most polymers (H < 0.3 GPa), while the uniformly dispersed micelles decrease the Young’s modulus (E = 5.89 GPa) to a value as low as that of common plastics, resulting in excellent hardness and flexibility, with an H/E of 14.1% and an elastic recovery rate (We) of 86.3%. Scratches (～50 μm) on the coating can be healed within 4 min. The hybrid composition of poly(silsesquioxane) networks also shows great advantages in integration with other functional components to realize programmable multifunctionality without diminishing the basic properties. This nanocomposite design provides a route toward the preparation of materials with excellent comprehensive functions without trade-offs between these properties.

DOI: 10.1021/jacs.1c10455

Source: https://pubs.acs.org/doi/10.1021/jacs.1c10455