Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan 030001, China.
State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences , Xi'an 710119, China.
ACS Appl Mater Interfaces. 2017 Feb 15;9(6):5468-5476. doi: 10.1021/acsami.6b14117. Epub 2017 Feb 1.
Superhydrophilic antireflective periodic mesoporous organosilica (PMO) coating was prepared on flexible polyimide substrate via solvent-evaporation-induced self-assembly (SEISA) method, in which tetraethoxysilane (TEOS) and a special bridged silsesquioxane were used as reactants. The bridged silsesquioxane, EG-BSQ, was synthesized through the stoichiometric reaction between 3-glycidoxyporpyltrimethoxysilane (GPTMS) and ethylene diamine (EDA). Under the influence of surfactant, TEOS and EG-BSQ co-condensed and enclosed the ordered mesporous in the coating. The results of grazing-incidence small-angle X-ray scattering (GISAXS) and the transmission electron microscope (TEM) indicated that the mesopores belonged to a Fmmm orthorhombic symmetry structure. With increasing EG-BSQ concentration, the mesoporous structure in the PMO coating becomes more and more disordered because silica mesopore walls shrunk or collapsed during calcination and consequently the refractive index of PMO coating became larger. The antireflective (AR) PMO coating showed an optical transmittance of 99.54% on polyimide (PI) much higher than the 88.68% of bare PI. The water contact angle of PMO coating was less than 9.0°, which indicated the AR PMO coating was superhydrophilic. Moreover, the PMO coating showed an excellent mechanical property, the transmittance of the PMO coating displayed a very low loss of 0.1% after abrasion of 25 cycles by CS-10F wearaser.
超亲水抗反射周期性介孔有机硅（PMO）涂层通过溶剂蒸发诱导自组装（SEISA）方法在柔性聚酰亚胺基底上制备，其中四乙氧基硅烷（TEOS）和特殊的桥联硅倍半氧烷用作反应物。桥联硅倍半氧烷 EG-BSQ 通过 3-缩水甘油丙基三甲氧基硅烷（GPTMS）和乙二胺（EDA）之间的化学计量反应合成。在表面活性剂的影响下，TEOS 和 EG-BSQ 共缩合并在涂层中封闭有序介孔。掠入射小角 X 射线散射（GISAXS）和透射电子显微镜（TEM）的结果表明，介孔属于 Fmmm 正交对称结构。随着 EG-BSQ 浓度的增加，PMO 涂层中的介孔结构变得越来越无序，因为在煅烧过程中二氧化硅介孔壁收缩或坍塌，因此 PMO 涂层的折射率变大。抗反射（AR）PMO 涂层在聚酰亚胺（PI）上的光透过率为 99.54%，远高于裸 PI 的 88.68%。PMO 涂层的水接触角小于 9.0°，表明 AR PMO 涂层具有超亲水性。此外，PMO 涂层具有优异的机械性能，经过 25 次 CS-10F 磨损仪磨损后，PMO 涂层的透过率仅损失 0.1%。
