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Type: Artigo de periódico
Title: The effects of temperature of condensation on the thermal stability and morphology of 1,4-phenylenediamine-1-propylsilica xerogels
Author: Gay, D
Gushikem, Y
Moro, C
Costa, T
Benvenutti, E
Abstract: 1,4- phenylenediamine-1-propylsilica hybrid xerogels were obtained for two composition at different temperatures of gelation, from 5 up to 70 degrees C. The morphological effects produced by the different gelation temperatures were investigated by using N-2 adsorption-desorption isotherms and scanning electron microscopy. The thermal stability of the organic groups and their distribution on the xerogel matrix, i. e. the fraction of the organic groups that were trapped in closed pores, formed during the xerogel synthesis, and the fraction of organic groups present on the surface, were obtained by using infrared thermal analysis. The higher porosity of the xerogels and the higher thermal stability of the organic groups were achieved for samples gelled at 25 degrees C.
Subject: sol-gel
FTIR thermal analysis
gelation temperature
Country: Holanda
Editor: Springer
Citation: Journal Of Sol-gel Science And Technology. Springer, v. 34, n. 2, n. 189, n. 195, 2005.
Rights: fechado
Identifier DOI: 10.1007/s10971-005-1365-6
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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