Pregled bibliografske jedinice broj: 24804
Determination of the Kinetic Parameters of the Thermooxidative Degradation of Styrene - Butadiene Copolymers
Determination of the Kinetic Parameters of the Thermooxidative Degradation of Styrene - Butadiene Copolymers // Program and Book of Abstracts, International Conferences on Polymer Characterization / Vitold Brostow, University of North Texas (ur.).
Denton (TX): University of North Texas, Denton,USA, 1998. (poster, međunarodna recenzija, sažetak, znanstveni)
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Naslov
Determination of the Kinetic Parameters of the Thermooxidative Degradation of Styrene - Butadiene Copolymers
Autori
Holjevac-Grgurić, Tamara ; Rek, Vesna ; Jelčić, Želimir
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Program and Book of Abstracts, International Conferences on Polymer Characterization
/ Vitold Brostow, University of North Texas - Denton (TX) : University of North Texas, Denton,USA, 1998
Skup
International Conferences on Polymer Characterization
Mjesto i datum
Denton (TX), Sjedinjene Američke Države, 07.01.1998. - 09.01.1998
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
Thermooxidative Degradation; Styrene-Butadiene Copolymers; Reaction Rate Constants; Activation Energy; Isothermal DSC
Sažetak
The stability of polymer materials is very
important for their practical use under high
temperatures. The intensity of the
thermooxidative degradation can be followed
through kinetic parameters. In styrene- butadiene
copolymers, soft, polybutadiene phase (PB) and
hard, polystyrene phase (PS) have a different
sensibility on thermal degradation. The
thermooxidative stability of high-impact
polystyrene (PS-HI), styrene-butadiene-styrene
block copolymers, (SBS), and PS-HI/SBS blends
were investgated. The investigation were done by
isothermal DSC analysis. The kinetic parameters
of the thermooxidative 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 heat of degradation. On
the basis of the heat of the thermooxidative
degradation the conversion (alpha) and the rate
of the thermooxidative degradation (d alpha/dt)
have been obtained. The experimental data have
been tested with kinetic model for autocatalytic
reactions: d alpha/ dt = k alpha m (1-alpha) n.
The activation energy has been determined by
Arrhenius equation. On the base of the kinetic
parameters, the order of the thermooxidative
stability of the investigated system has been
obtained. The agreement of the experimental data
with autocatalytic model were discussed.
Izvorni jezik
Engleski
Znanstvena područja
Kemijsko inženjerstvo
