Jiang Lan, Kato Kazuaki, Mayumi Koichi, Yokoyama Hideaki, Ito Kohzo
Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi Chiba 277-8561, Japan.
ACS Macro Lett. 2017 Mar 21;6(3):281-286. doi: 10.1021/acsmacrolett.7b00014. Epub 2017 Mar 6.
A novel kind of polyrotaxane-silica hybrid aerogel is successfully prepared via one-pot sol-gel synthesis in this work. The polyrotaxane can chemically interpenetrate with Si particles homogeneously in nanoscale, so as to shorten the gelation time and construct a flexible and mechanically strong skeleton. The supramolecular effect ascribable to the sliding motion of cyclic components in polyrotaxane is introduced into the hybrid aerogel for the first time. Compared with the brittle pure silica aerogel, the obtained polyrotaxane-silica hybrid aerogels show very low density, low thermal conductivity, and more than two orders magnitude improvement in the compression strength without compromising transparency.
在本工作中，通过一锅法溶胶-凝胶合成成功制备了一种新型聚轮烷-二氧化硅杂化气凝胶。聚轮烷能在纳米尺度上与硅颗粒均匀地化学互穿，从而缩短凝胶化时间并构建出柔性且机械强度高的骨架。首次将归因于聚轮烷中环状组分滑动运动的超分子效应引入到杂化气凝胶中。与脆性纯二氧化硅气凝胶相比，所制备的聚轮烷-二氧化硅杂化气凝胶密度极低、热导率低，并且压缩强度提高了两个多数量级，同时不影响透明度。
