Characterization of castor oil based polyurethane films prepared with N-methyl-2-pyrrolidinone as a solvent
Article first published online: 29 JUL 2005
Copyright © 2005 Wiley Periodicals, Inc.
Journal of Applied Polymer Science
Volume 98, Issue 2, pages 746–749, 15 October 2005
How to Cite
Malmonge, J. A., Dos Santos, M. A., Malmonge, L. F., Kanda, D. H. F., Chierice, G. O. and Sakamoto, W. K. (2005), Characterization of castor oil based polyurethane films prepared with N-methyl-2-pyrrolidinone as a solvent. J. Appl. Polym. Sci., 98: 746–749. doi: 10.1002/app.22103
- Issue published online: 29 JUL 2005
- Article first published online: 29 JUL 2005
- Manuscript Accepted: 1 FEB 2005
- Manuscript Received: 14 JUN 2004
- Fundação de Amparo a Pesquisa do Estado de São Paulo
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (through a student fellowship to M.A.S.).
- glass transition;
- dielectric properties
Molecular mobility in castor oil based polyurethane was investigated with thermally stimulated depolarization current (TSDC) measurements and alternating-current (ac) dielectric relaxation spectroscopy. Three peaks could be observed in TSDC thermograms from 173 to 373 K. The relaxation located at 213 K could be attributed to the change in the molecular chain due to the interaction between the isocyanate and the solvent, and it was well fitted with the Vogel–Fulcher–Tammann equation. The other two peaks were located at 274 and 365 K and could be attributed to interfacial polarization and space charge, respectively. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 746–749, 2005