期刊
THERMOCHIMICA ACTA
卷 560, 期 -, 页码 55-62出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tca.2013.03.015
关键词
Polyurethane; Siloxane; Thermal degradation; Kinetics; Semi-interpenetrating polymer network
A series of semi-interpenetrating polymer networks based on linear polyurethane and 1,3-bis(glycidyloxypropyl)-1,1,3,3-tetramethyldisiloxane, which was cross-linked with diethylenetriamine, were obtained. The samples have been submitted to thermal stability investigations at non-isothermal conditions in nitrogen. The kinetic parameters of the degradation process were determined both by isoconversional methods of Friedman and Ozawa-Flynn-Wall as well as by model fitting multivariate non-linear regression method. It was observed that the thermal stability of the semi-interpenetrating polymer networks depends on siloxane content. The best fit of the f(alpha) function with the experimental data was found for three-step degradation mechanism. Successive stages of thermal decomposition occurred by diffusion, phase-boundary and autocatalysis models, respectively. (C) 2013 Elsevier B.V. All rights reserved.
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