Naslov
Determination of the Kinetic Parameters of the Thermal Oxidative Degradation of Styrene/Butadiene Copolymers

Autori
Holjevac Grgurić, Tamara ; Rek, Vesna ; Hace, Drago ; Gomzi, Zoran ; Jelčić, Želimir

Izvornik
Polymer engineering and science (0032-3888) 39 (1999), 8; 1394-1397

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
PS-HI copolymer ; SBS copolymer ; PS-HI/SBS blends ; thermal oxidative degradation ; kinetic parameters

Sažetak
The intensity of the thermal oxidation has been followed through kinetic parameters. In styrene/butadiene copolymers, soft polybutadiene phase (PB) and hard polystyrene phase (PS) have different sensibilities to thermal degradation. The thermal oxidative stability of high-impact polystyrene (PS-HI), styrene/butadiene/styrene block copolymers (SBS), and PS-HI+SBS blends were investigated by isothermal DSC analysis. The kinetic parameters of the thermal oxidative degradative process: the reaction rate constants, the reaction orders and the activation energies have been determined. The total area under the exothermic curve was used to calculate the isothermal heats of degradation. The conversion (alpha) and the rate of the thermal oxidative degradation (dalpha/dt) have been derivated. The experimental data have been tested with a kinetic model for autocatalytic reactions: dalpha/dt = k alpha m ( 1 - alpha ) n. Activation energies have been determined from the Arrhenius equation and the order of the thermal oxidative stability evaluated. The extent of agreement of the experimental data with the autocatalytic model is discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

Napomena
Glavni autori: Tamara Holjevac Grgurić i Zoran Gomzi

POVEZANOST RADA