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Selected Works of William MacKnight
Article
Segmented Polyurethane Elastomers with Liquid Crystalline Hard Segments. 3. Infrared Spectroscopic Study
Macromolecules (1995)
  • William MacKnight, University of Massachusetts Amherst
  • Weiming Tang
  • Shaw L. Hsu
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Abstract
Segmented liquid crystalline polyurethanes (LCPUE) have been studied by infrared
spectroscopy. The nematic liquid crystalline hard domains act as physical cross-links and can be oriented
by the application of mechanical strain. The orientation function achievable in the hard segments results
from the combination of mechanical strain and stress-softening. Furthermore, elastic deformation induces
the rearrangement of some hard segments in the mesophase into a more ordered packing. Hightemperature
infrared spectra have been correlated with thermal transitions of the LCPUE, and a liquidliquid
microphase-separated morphology above the isotropization of the mesophase appears to exist.
Keywords
  • Segmented Polyurethane Elastonomers,
  • Liquid Crystalline,
  • Hard Segments,
  • Infrared Spectroscopy
Disciplines
Publication Date
1995
Citation Information
William MacKnight, Weiming Tang and Shaw L. Hsu. "Segmented Polyurethane Elastomers with Liquid Crystalline Hard Segments. 3. Infrared Spectroscopic Study" Macromolecules Vol. 28 (1995) p. 4284 - 4289
Available at: http://works.bepress.com/william_macknight/255/