ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
This paper is concerned with applications of a kinetic-diffusion model which accounts for the gel effect and glass effect for free radical polymerizations under nonisothermal conditions. Bulk polymerizations of styrene and unsaturated polyester in the batch casting process were investigated both experimentally and theoretically. A differential scanning calorimeter (DSC) and a Fourier transform infrared spectrometer (FTIR) were employed to elucidate incomplete reactions resulting from glass transition and dead-ending phenomena and to provide kinetic information for modelling. Temperature, conversion, and cumulative molecular weight profiles were simulated under several wall temperature programs. Predictions of ultimate cumulative molecular weights across the reactor, when compared with experimental results measured by gel permeation chromatography (GPC), affirmed that the molecular weight variation due to the radial temperature gradient could be alleviated by manipulating the wall temperature.
Additional Material:
13 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1987.070330422
