Synthesis and Properties of 1,3,5-Benzene Periodic Mesoporous Organosilica (PMO): Novel Aromatic PMO with Three Point Attachments and Unique Thermal Transformations
作者:Masakatsu Kuroki、Tewodros Asefa、Wesley Whitnal、Michal Kruk、Chiaki Yoshina-Ishii、Mietek Jaroniec、Geoffrey A. Ozin
DOI:10.1021/ja027877d
日期:2002.11.1
A new aromatic periodic mesoporousorganosilica material containing benzene functional groups that are symmetrically integrated with three silicon atoms in an organosilicamesoporousframework is reported. The material has a high surface area, well-ordered mesoporous structure and thermally stable framework aromatic groups. The functional aromatic moieties were observed to undergo sequential thermal
报道了一种含有苯官能团的新型芳香族周期性介孔有机二氧化硅材料,该苯官能团与有机二氧化硅介孔骨架中的三个硅原子对称结合。该材料具有高表面积、有序的介孔结构和热稳定的骨架芳族基团。观察到功能性芳族部分在空气下连续热解时经历从三到二的顺序热转变,然后在框架内进行一点连接,然后最终在高温和更长的热解时间下转化为不含芳族基团的周期性介孔二氧化硅. 材料的介孔率通过粉末 X 射线衍射 (PXRD)、透射电子显微镜 (TEM) 和氮孔隙率测定法表征,而材料壁中芳族基团的存在和转化通过固态核磁共振光谱、质谱和热重分析进行表征。苯环对称连接到骨架的三个硅氧烷上被有利地用作交联剂以提高有机基团的热稳定性。与其他只有两点连接的芳香族 PMO 和只有一个点连接的无定形苯基硅胶相比,研究了其中一些特性。通过两个以上的点成功合成了第一个有机基团连接在骨架内的芳香族PMO,是朝着合成具有更复杂和多个骨架连接的有机基团的PMO迈出的重要一步。
High-molecular weight, silicon-containing polymers and methods for the
申请人:The Regents of the University of California
公开号:US05229481A1
公开(公告)日:1993-07-20
Polymer materials are described, which are formed by polymerization of monomer mixtures containing at least one compound of the formula I (RH.sub.2 Si).sub.x A (I) wherein R is selected from the group consisting of hydrogen, unsubstituted alkyl, substituted alkyl, unsubstituted aryl and substituted aryl; A is a polyvalent moiety; and x is 2-4. Methods for preparation of polymers derived from monomer mixtures consisting essentially of polyvalent polysilanes, as well as mixtures of polysilanes with monovalent monosilanes, are also described.