Abstract

tThe kinetic behavior of innovative photopolymerizable UV-cured methacrylic–silica hybrid formula-tions, previously developed, was studied and compared to that of a reference control system. Theorganic–inorganic (O–I) hybrids proposed in this study are obtained from organic precursors with a highsiloxane content mixed with tetraethoxysilane (TEOS) in such a way to produce co-continuous silicanano-domains dispersed within a cross-linked organic phase, as a result of the hydrolysis and condensa-tion reactions. The kinetics of the radical photopolymerization mechanism induced by UV-radiations, inpresence of a suitable photoinitiator, was studied by calorimetric, FTIR and Raman spectroscopic analy-ses, by varying the composition of the mixtures and the atmosphere for reactions. The well known effectof oxygen on the kinetic mechanism of the free radical photopolymerization of the methacrylic–siloxanebased monomers was found to be strongly reduced in the hybrid system, especially when a properthiol was used. The experimental calorimetric data were fitted using a simple kinetic model for radicalphotopolymerization reactions, obtaining a good agreement between the experimental data and the the-oretical model. From the comparison of the kinetic constants calculated for control and hybrid systems,it was possible to assess the effect of the composition, as well as of the atmosphere used during thephoto-polymerization process, on the kinetic of photopolymerization reaction.

Autore Pugliese

• Frigione Mariaenrica , Esposito Corcione Carola

Tutti gli autori

• C. Esposito Corcione , R. Striani , M. Frigione

Titolo volume/Rivista

THERMOCHIMICA ACTA

Anno di pubblicazione

2014

ISSN

0040-6031

ISBN

Non Disponibile

Numero di citazioni Wos

12

Ultimo Aggiornamento Citazioni

28/04/2018

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile