Characterization of castor oil based polyurethane films prepared with N-methyl-2-pyrrolidinone as a solvent
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Wiley-Blackwell
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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. (c) 2005 Wiley Periodicals, Inc.
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glass transition, polyurethanes, dielectric properties
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Journal of Applied Polymer Science. Hoboken: John Wiley & Sons Inc., v. 98, n. 2, p. 746-749, 2005.
