Karmore, Vishal and Madras, Giridhar (2000) Continuous Distribution Kinetics for the Degradation of Polystyrene in Supercritical Benzene. In: Industrial & Engineering Chemistry Research, 39 (11). pp. 4020-4023.
ie0005203.pdf - Published Version
Restricted to Registered users only
Download (84Kb) | Request a copy
The degradation kinetics of polystyrene (PS) in supercritical benzene was studied at various temperatures (300-330 degreesC) at 5.0 MPa. The time evolution of the molecular weight distributions was obtained by analyzing the samples with gel permeation chromatography. The evolution was modeled with continuous distribution kinetics by assuming that the degradation rate coefficient varied linearly with molecular weight. The activation energy of the rate coefficient was determined to be 13.8 kcal/mol. The degradation rate coefficients obtained in supercritical benzene were substantially higher than the rate coefficients observed for degradation of PS in subcritical solvents at high pressures and in solvents at normal pressures. This significant enhancement in the degradation rate may be due to enhanced diffusivity in supercritical fluids.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to American Chemical Society.|
|Department/Centre:||Division of Mechanical Sciences > Chemical Engineering|
|Date Deposited:||05 Mar 2009 11:28|
|Last Modified:||19 Sep 2010 04:54|
Actions (login required)