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Kinetics of Ultrasonic Polymer Degradation: Comparison of Theoretical Models with On‐Line Data
Author(s) -
Akyüz Ali,
CatalgilGiz Huceste,
Giz Ahmet T.
Publication year - 2008
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700533
Subject(s) - kinetics , polymer , phenomenological model , sonication , drop (telecommunication) , molecular model , ultrasonic sensor , materials science , thermodynamics , chemistry , polymer chemistry , chemical engineering , composite material , mathematics , organic chemistry , physics , chromatography , computer science , statistics , telecommunications , quantum mechanics , acoustics , engineering
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.