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Kinetics of Ultrasonic Polymer Degradation: Comparison of Theoretical Models with On-Line Data

✍ Scribed by Ali Akyüz; Huceste Catalgil-Giz; Ahmet T. Giz

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 384 KB
Volume: 209
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.200700533

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✦ Synopsis

Abstract

PVP solutions were sonicated with high‐intensity ultrasound, and the weight‐average molecular weight was monitored by an ACOMP system. The use of continuous on‐line data to critically evaluate various models showed that the molecular weight decreased towards a limiting value. Theoretical and phenomenological models of evolution of the molecular weight during sonication are compared with the on‐line data. The Ovenall/Harrington/Madras and Giz and Tang models werer found to describe the results adequately. These models share the property of an initial rapid drop in molecular weight followed by a slowing down of the rate of molecular weight decrease.

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