ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Thermooxidative stability of polymethyl methacrylate containing nanoparticles of silica/titania and silica/zirconia
Peter Šimon, Wei Zhong, Dušan Bakoš, and David Hynek
Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic
Received: 24 March 2007 Revised: 13 July 2007 Accepted: 20 July 2007
Abstract: The influence of silica/titania and silica/zirconia nanoparticles on thermooxidative degradation of PMMA was studied by non-isothermal
thermogravimetry. Kinetic parameters describing the length of the oxidation induction periods were obtained from the treatment
of the dependence of oxidation onset temperature on heating rate. Using these parameters, the protection factors of nanoparticles
have been calculated. It was found that SiO2/TiO2 nanoparticles increase the thermooxidation stability of PMMA where the stabilizing effect, expressed as the protection factor,
depends on temperature only slightly. The stabilizing effect of SiO2/ZrO2 is much stronger than that of SiO2/TiO2 and decreases with increasing temperature.
Keywords: thermooxidation - polymethyl methacrylate - nanoparticles - silica - titania - zirconia
Full paper is available at www.springerlink.com.
Chemical Papers 62 (2) 176–180 (2008)