TiO2/MPMS-SSO光学保护膜的制备与性能研究

以正硅酸乙酯、钛酸丁酯、甲基丙烯酰氧基倍半硅氧烷(MPMS-SSO)、γ-环氧丙氧丙基三甲氧基硅烷为原料,通过溶胶-凝胶法制备了Si-Ti杂化涂料、甲基丙烯酰氧基倍半硅氧烷(MPMS-SSO)涂料、甲基丙烯酰氧基倍半硅氧烷与钛酸丁酯杂化的MPMS-SSO-Ti涂料,并在PMMA上成膜。用FT-IR、UV-VIS、动态摩擦减重测试和TG/DSC等对薄膜的结构、透光率、机械性能和热性能进行表征,并分析了Si-Ti、MPMS-SSO和MPMS-SSO-Ti 3种涂料对PMMA膜的影响。结果表明:Si-Ti、MPMS-SSO、MPMS-SSO-Ti光学保护膜在保持PMMA基片透光率基本不变的同时,有效地提高了耐磨性;MPMS-SSO薄膜的耐磨效果最好,MPMS-SSO膜次之,Si-Ti膜最次。从表面应力、预滑动摩擦力和动摩擦力3个方面分析有机无机杂化膜耐磨性能,能够有效解释涂覆Si-Ti、MPMS-SSO、MPMS-SSO-Ti涂料耐磨性依次提高的事实。Si-Ti、MPMS-SSO、MPMS-SSO-Ti薄膜热稳定性良好,其中MPMS-SSO-Ti薄膜耐热性最好。分析表明,微观上具有规整网络结构的倍半硅氧烷与TiO2杂化对提高薄膜的耐磨性能和热稳定性起着重要作用。

Preparation & Performance of Photo-Protective Films Containing TiO2/MPMS-SSO

Tetrabutyl titanate(TBOT),tetraethoxysilane(TEOS),and 3-(methacryloxy)propyl]trimethoxysilane(MPMS-SSO) were used as raw materials for the preparation of Si-Ti hybrid(Si-Ti) coatings,poly3-(methacryloxy)propyl]silsesquioxane(MPMS-SSO) coatings,and the hybrid of poly3-(methacryloxy)propyl]silsesquioxane(MPMS-SSO) and tetrabutyl titanate(MPMS-SSO-Ti) coatings by sol-gel method.These coatings were cast onto PPMA to form optical protecting films for PMMA.FT-IR,UV-VIS,pencil hardness,and dynamic scratch tests were used to characterize the structure,optical transparency,mechanical and thermal properties of these films.The results showed that Si-Ti,MPMS-SSO and MPMS-SSO-Ti films could effectively improve the abrasion resistance of the PMMA photo-slices without sacrificing its excellent transparency properties with the MPMS-SSO films showing the best abrasion resistant and the Si-Ti films showing the worst abrasion resistance.It can be reasonably explained why the abrasion resistance of Si-Ti,MPMS-SSO,MPMS-SSO-Ti coatings is in proper order by analyzing the abrasion resistance of the organic-inorganic hybrids from the perspective of surface stress,static sliding friction,dynamic friction.All of the Si-Ti,MPMS-SSO,MPMS-SSO-Ti films shows good thermal stability with MPMS-SSO-Ti film being the best.Hybridization of POSS with regular network structure and TiO2 at a microscopic size plays an important role in abrasion resistance and thermal stability.