Characterization of castor oil based polyurethane films prepared with N-methyl-2-pyrrolidinone as a solvent

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 21...

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Bibliographic Details
Published in:Journal of applied polymer science 2005-10, Vol.98 (2), p.746-749
Main Authors: Malmonge, J. A., Dos Santos, M. A., Malmonge, L. F., Kanda, D. H. F., Chierice, G. O., Sakamoto, W. K.
Format: Article
Language:English
Subjects:
Applied sciences
dielectric properties
Exact sciences and technology
glass transition
Organic polymers
Physicochemistry of polymers
polyurethanes
Properties and characterization
Structure, morphology and analysis
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Summary: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
ISSN:0021-8995
1097-4628
DOI:10.1002/app.22103