摘要
柔性聚合物防雾/防霜膜适用于聚合物基底,即使在弯折变形或温度升高时也不会碎裂或从基底脱离。但是,柔性聚合物防雾/防霜膜比较柔软容易受到损伤,使膜的透明性或结构完整性下降。为了解决这个问题,我们以氢键作用和静电作用为成膜驱动力、利用指数增长的层层组装方法制备了聚乙烯基亚胺(PEI)/透明质酸-聚丙烯酸(HA-PAA)膜,该膜在可见光区透过率高达98%,且在极端的条件下具有优异的防雾防霜性能。同时该膜具有良好的自修复性能,当该膜受到损伤时,只需放置在25℃、相对湿度为65%的环境中,其透明性和受损结构就可以得到修复。将自修复功能引入到柔性聚合物防雾防霜膜中能有效的提高其稳定性并延长其使用寿命~([1])。
Polymeric antifogging/frost-resisting coatings are suitable for use on flexible substrates but are vulnerable to accidental scratches and cuts. To solve this problem, we present the fabrication of healable, highly transparent antifogging and frost-resisting polymeric coatings via the layer-by-layer assembly of poly(ethylenimine)(PEI) and a blend of hyaluronic acid and poly(acrylic acid)(HA-PAA). Due to their remarkable water-absorbing capability, the highly transparent and flexible(PEI/HA-PAA)*50 coatings show excellent antifogging and frost-resisting capabilities even under aggressive fogging and frosting conditions. Meanwhile, these coatings can conveniently and repeatedly heal scratches and cuts several tens of micrometers deep and wide in the same region upon exposure to water because of the dynamic nature of the PEI/HA-PAA coatings. The healability of the(PEI/HA-PAA)*50 coatings provides a new way to design transparent antifogging/frost-resisting polymeric coatings with high flexibility, enhanced reliability, and extended service life.
引文
[1]Wang,Y.;Li,T.;Li,S.;Sun,J.Chem.Mater.,2015,27(23),8058-8065