期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 347, 期 1-3, 页码 114-120出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2009.01.016
关键词
Sol gel; Bridged polysilsesquioxanes; Polysiloxanes; Organosilicas; Hybrid materials; Co-condensation; Functionalization; Adsorption; Adsorbents; Porosity
Amino-, thiol-, urea-, acethoxy-, cyano-, isocyanato-, chloro-, vinyl-, and phenyl-functionalized polysilsesquioxane and polysiloxane xerogels have been obtained by co-condensation of 1,2-bis(triethoxysilyl)ethane (BTSE) or tetraethoxysilane (TEOS) with appropriate trifunctional silanes (FOSs). The structural and chemical information were derived from the data of FT-IR, AFM, elemental analysis and adsorption measurements. The resulting xerogels have a porous structure (S-BET in the range 500-1200 m(2)/g) and a high content of functional groups (2.3-4.0 mmol/g). Properties of the resulting samples depend on two factors: structure building agent used in the synthesis (BTSE vs. TEOS) and the nature of the organic pendant group introduced by co-condensation. The presence of the ethane bridges in the silsesquioxane network makes the resulting materials more robust. The aging time was found to have a drastic effect on the structure-adsorption characteristics of the polysiloxanes. (C) 2009 Elsevier B.V. All rights reserved.
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