The thermal decomposition kinetics of polysiloxane /polymethylacrylate IPNs materials

Abstract

Polydimethylsiloxane/polymethylacrylate (PDMS/PMA) interpenetratrating polymer networks (IPNs) was fabricated by simultaneous synthesis and characterized by thermogravimetry (TG). The kinetics of the thermal decomposition of polysiloxane/polymethylacrylate IPNs in N₂ and air was studied at different heating rates. It was observed that there were two decomposition peaks both in N₂ and air, which showed that thermal decomposition process obeyed two-step pyrolysis mechanism and accorded with the two compositions of IPN. Kinetic parameters were determined during simultaneous integration of the Doyle equation and the IPN/s kinetics equation was one-order equation in N₂ and Air. The decomposition activation energy in N₂ and air were 147.405 kJ·monl⁻¹ and 192.656 kJ·monl⁻¹ respectively.

Keywords

polysiloxane / polymethylacrylate / IPNs / thermogravimetery / kinetics

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