Kim Yun Hyeok, Choi Gwang-Mun, Bae Jin Gyu, Kim Yong Ho, Bae Byeong-Soo
Wearable Platform Materials Technology Center, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
Polymers (Basel). 2018 Apr 17;10(4):449. doi: 10.3390/polym10040449.
A high performance ladder-like structured methacrylate siloxane hybrid material (LMSH) was fabricated via simple hydrolytic sol⁻gel reaction, followed by free-radical polymerization. A structurally ordered siloxane backbone, the ladder-like structure, which is an essential factor for high performance, could be achieved by a short period of sol⁻gel reaction in only 4 h. This results in superior optical (Transmittance > 90% at 550 nm), thermal (T > 400 ℃ ), mechanical properties(elastic recovery = 0.86, hardness = 0.6 GPa) compared to the random- and even commercialized cage-structured silsesquioxane, which also has ordered structure. It was investigated that the fabricated ladder-like structured MSH showed the highest overall density of organic/inorganic co-networks that are originated from highly ordered siloxane network, along with high conversion rate of polymerizable methacrylate groups. Our findings suggest a potential of the ladder-like structured MSH as a powerful alternative for the methacrylate polysilsesquioxane, which can be applied to thermally stable and flexible optical coatings, even with an easier and simpler preparation process.
通过简单的水解溶胶-凝胶反应，随后进行自由基聚合，制备了一种高性能的梯状结构甲基丙烯酸酯硅氧烷杂化材料（LMSH）。通过仅4小时的短时间溶胶-凝胶反应，可以实现具有结构有序的硅氧烷主链，即梯状结构，这是高性能的关键因素。与同样具有有序结构的无规甚至商业化的笼状结构倍半硅氧烷相比，这导致其具有优异的光学性能（550nm处透过率>90%）、热性能（T>400℃）和机械性能（弹性回复率=0.86，硬度=0.6GPa）。研究表明，所制备的梯状结构MSH显示出源自高度有序硅氧烷网络的有机/无机共网络的最高总体密度，以及可聚合甲基丙烯酸酯基团的高转化率。我们的研究结果表明，梯状结构MSH有潜力成为甲基丙烯酸酯聚倍半硅氧烷的有力替代品，即使制备过程更简便，也可应用于热稳定且柔性的光学涂层。
