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A Comparative FTIR study of thermal and photo-polymerization processes in hybrid sol-gel films

Innocenzi, Plinio and Brusatin, Giovanna (2004) A Comparative FTIR study of thermal and photo-polymerization processes in hybrid sol-gel films. Journal of Non-Crystalline Solids, Vol. 333 (2), p. 137-142. ISSN 0022-3093. Article.

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DOI: 10.1016/j.jnoncrysol.2003.09.043

Abstract

Controlling the organic polymerization in organic-inorganic hybrids is a key point in the development of new materials with high homogeneity of the nanostructure. The main difficulty is related with the achievement of a simultaneous control of the organic and inorganic network formation. Thermal and photocuring represent the main routes to form the organic chains when polymerizable organic groups are present in the hybrid materials. In the present work hybrid organic-inorganic films were synthesized from 3-methacryloxypropyltrimethoxysilane (MPTMS) cohydrolyzed with tetraethylorthosilicate (TEOS) and N-[(3-trimethoxysilyl)propyl]ethylenediamine (TMESPE) or 3-(triethoxysilyl)-propylamine (TESPA). This an example of basic catalyzed hybrid material with a polymerizable methacrylate functionality whose micro-structure is modified by the amine groups. FTIR spectroscopy was used to compare the effects of thermal or photo-induced polymerization on the materials. TESPA and TMESPE showed a different catalytic effect on the condensation of the inorganic network, with TMESPE the more efficient one. The presence of a more extended silica backbone reduced the curing efficiency in TMESPE derived samples. UV curing was also very effective in catalyzing the inorganic condensation of un-reacted species still present in the film after the deposition. A photo-induced polymerization of the inorganic side was observed in the hybrid films. Thermal polymerization in TMESPE films induces the reaction between the secondary amine and C O bonds in MPTMS, this reaction is, instead, not observed in films cured by UV radiation.

Item Type:Article
ID Code:1301
Status:Published
Refereed:Yes
Uncontrolled Keywords:FTIR spectroscopy, sol-gel film, organic polymerization in organic-inorganic hybrids, 3-methacryloxypropyltrimethoxysilane (MPTMS), tetraethylorthosilicate (TEOS), N-[(3-trimethoxysilyl)propyl]ethylenediamine (TMESPE)
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
001 Università di Sassari > 01 Dipartimenti > Architettura e pianificazione
Publisher:Elsevier Science
ISSN:0022-3093
Deposited On:18 Aug 2009 10:04

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