Generation of Microporosity in a Hybrid Material. Access to Pillared Amorphous Organosilicate
Generation of Microporosity in a Hybrid Material. Access to Pillared Amorphous Organosilicate
复制标题
混合材料中微孔的产生。
DOI：
10.1021/cm991042t
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发表时间：
1999
影响因子：
8.6
通讯作者：
Valérie Le Strat
中科院分区：
文献类型：
--
作者：
B. Boury;and Robert J. P. Corriu;Valérie Le Strat
通过在通式为{[(O)1.5Si−C⋮C−C6H4−C⋮C−Si(O)1.5]x[(O)1.5Si−C6H4−C6H4−Si(O)1.5]1-x}.的杂化干凝胶中选择性地去除刚性的1，4-二(乙炔)苯基，研究了在杂化干凝胶中产生可控孔隙率的新路线的可能性在四氢呋喃(A：B)=(100：0)、(80：20)、(60：40)、(40：60)、(20：80)和(0：100)的四氢呋喃中，前驱体1，4-双(三甲氧基乙炔)苯与不同量的前驱体B(4，4‘-双(三甲氧基硅基)联苯)在盐酸催化的Sol−凝胶共缩聚反应中制备了干凝胶。A的1，4-二(乙炔基)苯基的消除是通过选择性和温和的化学处理来实现的，该处理阻止了前驱体B引入的联苯基的消除。用氦比浊法、吸水法以及氮气和Ar气孔仪测量了化学处理前后材料的孔隙率，这种孔隙率主要与初始的(A：B)比有关。一种微孔材料，具有高...
The potentiality of a new route for creating a controlled porosity in an hybrid xerogel was investigated using the selective removal of the rigid 1,4-bis(ethynyl)benzene group in an hybrid xerogel of the general formula {[(O)1.5Si−C⋮C−C6H4−C⋮C−Si(O)1.5]x[(O)1.5Si−C6H4−C6H4−Si(O)1.5]1-x}. Preparation of these xerogels was achieved by HCl-catalyzed sol−gel copolycondensation of precursor A, 1,4-bis(trimethoxysilylethynyl)benzene, mixed with various amount of precursor B, 4,4‘-bis(trimethoxysilyl)biphenyl, in THF ((A:B) = (100:0), (80:20), (60:40), (40:60), (20:80) and (0:100). Elimination of the 1,4-bis(ethynyl)benzene group of A was achieved by a selective and mild chemical treatment that prevents the elimination of the biphenylene group introduced by precursor B. The porosity of the materials before and after chemical treatment was measured by helium pycnometry, water adsorption, and N2 and Ar porosimetry, this porosity mainly varies in relation to the initial (A:B) ratio. A microporous material with high...