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, cilt.209, sa.8, ss.801-809, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 209 Sayı: 8
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1002/macp.200700533
  • Dergi Adı: MACROMOLECULAR CHEMISTRY AND PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.801-809
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

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.