Isothermal kinetics of photopolymerization and thermal polymerization of bis-GMA/TEGDMA resins

Autor:	Xavier Fernández-Francos, A. Cadenato, Josep Maria Salla, J. M. Morancho, Xavier Ramis
Rok vydání:	2008
Předmět:	Autocatalysis Materials science Photopolymer Reaction rate constant Polymerization Autoacceleration Polymer chemistry Kinetics Thermodynamics Physical and Theoretical Chemistry Condensed Matter Physics Isothermal process Curing (chemistry)
Zdroj:	Journal of Thermal Analysis and Calorimetry. 92:513-522
ISSN:	1572-8943 1388-6150
DOI:	10.1007/s10973-007-8432-x
Popis:	The purpose of this work is to analyse certain kinetic features related to thermoinduced and photoinduced isothermal curing in the 25/75 mass% bis-GMA/TEGDMA system. The kinetic parameters associated with photo and thermal curing were determined and compared using an isoconversional procedure and the kinetic model was obtained by means of a reduced master plot. In photocuring, the kinetic results obtained by means of this phenomenological methodology were compared with those obtained on the basis of mechanistic considerations. In this case, we estimated the propagation and termination constants associated with photocuring at different conversions. When the phenomenological procedure is performed, the rate constant decreases slightly during the curing process and the autoacceleration effect of the process is demonstrated in the kinetic model, which is autocatalytic. However, in the mechanistic model, this same effect is noted through an increase in the rate constants, while it is assumed that the kinetic model is in the order of n with n=1.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7dd9c7f9e274469d832da2cb5915f81f https://doi.org/10.1007/s10973-007-8432-x Zobrazit plný text záznamu Plný text ve formátu PDF