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    POLYMER NANOENCAPSULATED ACID-CATALYZED SOL-GEL SILICA MONOLITHS
    1.
    发明申请
    POLYMER NANOENCAPSULATED ACID-CATALYZED SOL-GEL SILICA MONOLITHS 审中-公开
    聚合物纳米催化酸催化溶胶凝胶二氧化硅单体

    公开(公告)号：US20100204355A1

    公开(公告)日：2010-08-12

    申请号：US12676123

    申请日：2008-09-05

    申请人： Nicholas Leventis ,  Sudhir Mulik ,  Xiaojiang Wang ,  Chariklia Sotiriou-Leventis

    发明人： Nicholas Leventis ,  Sudhir Mulik ,  Xiaojiang Wang ,  Chariklia Sotiriou-Leventis

    IPC分类号： C08G18/00 ,  B05D3/02

    CPC分类号： C08G77/02 ,  C08G18/3895 ,  C08G77/458 ,  C08G2101/0091 ,  Y02P20/544 ,  Y10T428/249991

    摘要： Macroporous monolithic silica aerogels having mesoporous walls are produced via an acid-catalyzed sol-gel process from tetramethoxysilane (TMOS) using a triblock co-polymer (Pluronic P123) as a structure-directing agent and 1,3,5-trimethylbenzene (TMB) as a micelle-swelling reagent. Pluronic P 123 was removed by solvent extraction, and monoliths were obtained by removing the pore-filling solvent with liquid CO2, which was removed under supercritical conditions. The resulting materials are more robust compared to base-catalyzed silica aerogels of similar density. Mechanical properties can be further improved by reacting a di-isocyanate with the silanol groups on the macro and mesoporous surfaces. The polymer forms a conformal coat on the macropores and blocks access to the mesopores of templated samples, so that BET surface areas decrease dramatically.

    摘要翻译： 通过使用三嵌段共聚物（Pluronic P123）作为结构导向剂和1,3,5-三甲基苯（TMB）的四甲氧基硅烷（TMOS）通过酸催化的溶胶 - 凝胶法生产具有介孔壁的大孔整体二氧化硅气凝胶， 作为胶束溶胀试剂。 通过溶剂萃取除去Pluronic P 123，通过用液体CO 2除去孔填充溶剂，在超临界条件下除去整料。 与相似密度的碱催化二氧化硅气凝胶相比，所得材料更加坚固。 通过使二异氰酸酯与宏观和介孔表面上的硅烷醇基团反应，可以进一步提高机械性能。 聚合物在大孔上形成共形涂层，并阻止进入模板样品的介孔，使得BET表面积急剧下降。