Zhang Xiaojie, He Junhui
1] Functional Nanomaterials Laboratory, Center for Micro/Nanomaterials and Technology and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancundonglu 29, Haidianqu, Beijing 100190, China [2] University of Chinese Academy of Sciences, Beijing 100864, China.
Functional Nanomaterials Laboratory, Center for Micro/Nanomaterials and Technology and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancundonglu 29, Haidianqu, Beijing 100190, China.
Sci Rep. 2015 Mar 18;5:9227. doi: 10.1038/srep09227.
Inspired by the repair of DNA through efficient reformation of hydrogen bonds (H-bonds), herein we report a facile one-step approach to construction of self-healing antifogging thin films on the basis of partly cross-linked poly(vinyl alcohol)(PVA) and poly(acrylic acid)(PAA). By designing the molar ratio of hydroxyl groups to carboxyl groups, the cross-linked polymer thin films maintain abundant free hydroxyl groups to present excellent antifogging property, which is derived from the hydrophilicity and hygroscopicity of the thin films. The thin films showed smart intrinsic self-healing characteristics towards wounds caused by external forces, which is attributed to sufficient free hydroxyl groups at the scratched interfaces to reform H-bonds across the interfaces and a sufficient chain mobility that is indispensable for chain diffusion across the interfaces and hydroxyl groups association to form H-bonds. No synthetic surfaces reported so far possess all the unique characteristics of the polymer thin films: intrinsic self-healing, long-term antifogging, excellent mechanical property, high transmittance and large-scale feasibility.
受通过高效重新形成氢键（H键）修复DNA的启发，在此我们报道了一种基于部分交联的聚乙烯醇（PVA）和聚丙烯酸（PAA）构建自修复防雾薄膜的简便一步法。通过设计羟基与羧基的摩尔比，交联聚合物薄膜保持大量游离羟基以呈现优异的防雾性能，这源于薄膜的亲水性和吸湿性。该薄膜对外力造成的伤口表现出智能的固有自修复特性，这归因于划痕界面处有足够的游离羟基以在界面上重新形成H键，以及足够的链迁移率，这对于链在界面间扩散和羟基缔合形成H键是必不可少的。迄今为止报道的合成表面都不具备该聚合物薄膜的所有独特特性：固有自修复、长期防雾、优异的机械性能、高透明度和大规模可行性。
