Shang X X, Duan S, Zhang M, Cao X Y, Zheng K, Zhang J N, Ma Y M, Zhang R B
Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 P. R. China
Key Laboratory of Light Industry and Chemical Auxiliary Chemistry and Technology, Ministry of Education, Shaanxi University of Science & Technology Xi'an 710021 P. R. China.
RSC Adv. 2018 Feb 28;8(17):9049-9056. doi: 10.1039/c8ra00063h.
A UV curable ladder-like diphenylsiloxane-bridged methacryl-phenyl-siloxane (L-MPS) was synthesized from phenyltrichlorosilane, diphenylsilanediol and methacryloxypropyldimethylmethoxysilane dehydrochlorination precoupling, supramolecular architecture-directed hydrolysis-condensation and end-capping reactions. The L-MPS has a condensation degree of ∼100%, and can be complete crosslinked by UV curing. XRD, TEM and molecular simulation suggest that the ladder-like molecules are close packed with a periodic distance of 1.2 nm. The L-MPS shows transmittance of 98% and a refractive index of 1.61 at 450 nm. The cured L-MPS with a value of 465.5 °C showed excellent anti-yellowing and anti-sulfidation properties. The cured L-MPS film and the encapsulated LED samples were compared with those of Dow Corning OE-6630 and OE-7662. It is believed that the dense nano-ladder unit also contributes to the thermal, gas barrier and even optical properties. L-MPS shows promising potential as a high power LED encapsulant and optical coating for use in harsh environments. This work provides an approach to integrate this novel ladder structure with advanced properties.
一种可紫外光固化的梯状二苯基硅氧烷桥连甲基丙烯酰基-苯基-硅氧烷（L-MPS）由苯基三氯硅烷、二苯基硅二醇和甲基丙烯酰氧基丙基二甲基甲氧基硅烷通过脱氯化氢预偶联、超分子结构导向的水解缩合及封端反应合成。L-MPS的缩合度约为100%，可通过紫外光固化完全交联。X射线衍射、透射电子显微镜和分子模拟表明，梯状分子紧密堆积，周期距离为1.2纳米。L-MPS在450纳米处的透光率为98%，折射率为1.61。固化后的L-MPS的热分解温度为465.5℃，具有优异的抗黄变和抗硫化性能。将固化后的L-MPS薄膜和封装的发光二极管样品与道康宁OE-6630和OE-7662的进行了比较。据信，致密的纳米梯单元也有助于其热性能、气体阻隔性能甚至光学性能。L-MPS作为用于恶劣环境的高功率发光二极管封装材料和光学涂层显示出有前景的潜力。这项工作提供了一种将这种具有先进性能的新型梯状结构整合起来的方法。
