Unsupported SiO2-based organic-inorganic membranes .1. Synthesis and structural characterization

被引：48

作者：

Dire, S ^{[1
]}

Pagani, E ^{[1
]}

Babonneau, F ^{[1
]}

Ceccato, R ^{[1
]}

Carturan, G ^{[1
]}

机构：

[1] UNIV PARIS 06,CNRS,PARIS,FRANCE

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1997年 / 7卷 / 01期

关键词：

SOL-GEL MATERIALS; STRUCTURE PROPERTY BEHAVIOR; NUCLEAR-MAGNETIC-RESONANCE; CONDENSATION PROCESS; HYBRID MATERIALS; SILICA-GELS; SI-29; TEOS; NMR; SPECTROSCOPY;

D O I：

10.1039/a603554j

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：

Tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) have been used to prepare hybrid SiO2-based membranes. These self-supported materials were obtained from controlled polymerization reactions for various TEOS/MTES molar ratios ensuring the achievement of crack-free disks 8 cm in diameter and 10-40 mu m in thickness. The rheological behaviour of precursor solutions was studied and gelling times were determined. The whole process, from starting solution to xerogel, was followed by FTIR spectroscopy, viscosity measurements and multinuclear solid-state NMR, and is discussed in terms of the hydrolysis-condensation kinetics of tetrafunctional and trifunctional silicon alkoxides. Density, shrinkage, elastic modulus (E), modulus of rupture (MOR) and elongation at break were all determined and related to preferential structural arrangements of networks according to the TEOS/MTES ratio.

引用

页码：67 / 73

页数：7

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