The synthesis of new hybrid materials that are prepared by the sol-gel technique is presented. The synthesis involves the reaction of a free hydroxylic group-containing cyclophosphazene, hexakis(4-hydroxyphenoxy)cyclophosphazene, and a hydrolyzed tetraethoxysilane under acid catalysis. Evidence for the formation of genuine chemical bonds between the hydroxylated cyclophosphazene and the three-dimensional silica network is presented. The formation of these bonds was confirmed by spectroscopic techniques (FTIR, 31P, 29Si, and 13C NMR both in solution and in the solid state and X-Ray Diffraction analysis). The results are supported by thermal characterization of the materials based on Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) determinations.
Hydroxylated cyclophosphazene/silica hybrid materials: synthesis and characterization
Dirè, Sandra;Ceccato, Riccardo;
2002-01-01
Abstract
The synthesis of new hybrid materials that are prepared by the sol-gel technique is presented. The synthesis involves the reaction of a free hydroxylic group-containing cyclophosphazene, hexakis(4-hydroxyphenoxy)cyclophosphazene, and a hydrolyzed tetraethoxysilane under acid catalysis. Evidence for the formation of genuine chemical bonds between the hydroxylated cyclophosphazene and the three-dimensional silica network is presented. The formation of these bonds was confirmed by spectroscopic techniques (FTIR, 31P, 29Si, and 13C NMR both in solution and in the solid state and X-Ray Diffraction analysis). The results are supported by thermal characterization of the materials based on Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) determinations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
