有机桥连聚倍半硅氧烷光学防潮涂层的制备

Preparation of organic bridging polysilsesquiloxane optical moisture-proof coating

以巯丙基三甲氧基硅烷(MPTMS)和3-(甲基丙烯酰氧)丙基三甲氧基硅烷为(MATMS)为原料,经巯-烯点击反应制备有机桥连硅烷前驱体3-三甲氧硅基丙基-2-甲基-3-[(3-三甲氧硅基)丙基硫代]丙酸酯(MPMA)。采用溶胶-凝胶法,MPMA在酸性条件下水解-缩聚得到溶胶,将其分别沉积在载玻片和聚醚酰亚胺(PEI)上得到有机桥连聚倍半硅氧烷涂层。通过测试水蒸气传输速率(WVTR)对涂层的防潮性能进行评价,并探究胶体老化时间对涂层防潮性能的影响。结果表明,溶胶老化30 h时,涂层的WVTR最低,为3.13 g/(m^(2)·d),具有优异的防潮性能,且涂层光透明性好,附着力达到0级,铅笔硬度为3H。

Organic bridging silane precursor,3-trimethonylsilylpropyl-2-methyl-3-[(3-trimethonylsilyl)-propylsulfanyl]propionate were prepared by mercaptopropyl trimethoxysilane and 3-methylacrylloxypropyltrimethoxysilane(MPMA)via thiol-ene click reaction.The sol was obtained by hydrolyzation and condensation polymerization of MPMA under acidic condition through sol-gel method.Then,the organicbridged polysilsesquioxane coatings were fabricated by depositing the sol on glass slide through dip-coating method and on polyetherimide through coating method,respectively.The moisture-proof performance of coating was evaluated by measuring the water vapor transport rate(WVTR)and the effect of colloid aging time on the moisture-proof performance of coating was investigated.The results showed that the coating had the lowest WVTR,which was 3.13 g/(m^(2)·d)when the sol aging time was 30h.Moreover,the coating possessed excellent moisture-proof performance and good optical transmittance.The adhesion was 0 grade and the pencil hardness was 3H.