29Si MAS NMR and FTIR study of inorganic-organic hybrid gels

被引:116
作者
Olejniczak, Z
Leczka, M
Cholewa-Kowalska, K
Wojtach, K
Rokita, M
Mozgawa, W
机构
[1] AGH Univ Sci & Technol, Fac MatSci & Ceram, PL-30059 Krakow, Poland
[2] Inst Nucl Phys, Krakow, Poland
关键词
hybrid material; gel-derived material; NMR spectroscopy; FTIR spectroscopy;
D O I
10.1016/j.molstruc.2004.11.069
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Inorganic-organic hybrid materials produced by the sol-gel method from Si(OR)(4) and R'Six-y(OR)(y)(R,R'-CnHm groups) compounds are very interesting materials for new optical techniques. Recognition of the structure of these materials is very important for controlling their production process as well as their properties. Five different hybrid gels were obtained using tetraethoxysilane (TEOS) with addition of the following modifiers: methyltrimethoxysilane (MTMS) (CH3)Si(CH3O)(3), vinyltriethoxysilane (VTES) (CH=CH2)Si(CH3CH2O)(3), phenyltriethoxysilane (PhTES) Ph-Si(CH3CH2O)(3) (Ph-phenyle group C6H5 diethoxydimethylsilane (DEDMS) (CH3)(2)Si(C2H5O)(2), diethoxymethylvinylsilane (DEMVS) (CH3)(CH=CH2)Si(C2H5O)(2). Copolymerisation of tetraethoxysilane (TEOS) and of the organic modifiers was studied by means of both the Si-29 MAS NMR and the FTIR spectroscopy. It has been found that according to the organic modifier used different Si-29 MAS NMR chemical shifts were observed. An attempt has been made to assign the signals to the corresponding structure units of gels. The FTIR spectra confirmed the formation of copolymers between TEOS and organic modifiers. Moreover, using Si-29 MAS NMR and FTIR spectroscopy the stability of the hybrid structure at the temperatures 100-500 degrees C was determined. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:465 / 471
页数:7
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