Kinetics of ultrasonic polymer degradation: Comparison of theoretical models with on-line data

Akyuz A., CATALGIL-GIZ H., Giz A. T.

MACROMOLECULAR CHEMISTRY AND PHYSICS, vol.209, no.8, pp.801-809, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 209 Issue: 8
  • Publication Date: 2008
  • Doi Number: 10.1002/macp.200700533
  • Journal Name: MACROMOLECULAR CHEMISTRY AND PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.801-809
  • Istanbul Technical University Affiliated: Yes

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.