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5275785 
Journal Article 
Kinetics of microwave-assisted oxidative degradation of polystyrene in solution 
Sivalingam, G; Agarwal, N; Madras, G 
2003 
Yes 
AIChE Journal
ISSN: 0001-1541
EISSN: 1547-5905 
AMER INST CHEMICAL ENGINEERS 
NEW YORK 
49 
7 
1821-1826 
English 
WOS:000184163300017 
The kinetics of the oxidative degradation of polystyrene in dichlorobenzene in the presence of benzoyl peroxide was studied in a microwave reactor. Solutions with peroxide concentration ranging from 15 to 40 kg/m(3) were irradiated by microwave of 700 W and frequency of 2.45 MHz with a different cycle heating period ranging from 20 to 45 s. The molecular-weight distributions were measured as a function of reaction time by gel permeation chromatography. Because the temperature of the system continuously varies with reaction time, a radical mechanism for oxidative degradation based on continuous distribution kinetics with time/temperature-dependent rate coefficients was proposed. The activation energy of 464 kJ/mol for the microwave-assisted oxidative degradation of polystyrene was obtained by nonlinearly regressing the experimental data. 
Engineering; similarity solutions, polymerization, enhancement, activation,; mechanisms, evolution, energy, cure