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Rheo-Optics of an Augned Thermotropic Liquid Crystalline Polymer

Published online by Cambridge University Press:  25 February 2011

Mohan Srinivasarao ,
Raul O. Garay ,
H. Henning Winter  and
Richard S. Stein
Mohan Srinivasarao
Affiliation:
Department of Polymer Science and Engineering University of Massachusetts, Amherst, MA 01003
Raul O. Garay
Affiliation:
Department of Polymer Science and Engineering University of Massachusetts, Amherst, MA 01003
H. Henning Winter
Affiliation:
Department of Polymer Science and Engineering University of Massachusetts, Amherst, MA 01003
Richard S. Stein
Affiliation:
Department of Polymer Science and Engineering University of Massachusetts, Amherst, MA 01003
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Abstract

Rheo-optical studies on aligned and unaligned melts of a main chain thermotropic polyester with flexible spacers are discussed in terms of the predictions of the Ericksen-Leslie equations. It is shown, using conoscopy, that the director is flowaligning at temperatures close to TNI and nonflow-aligning close to a smectic to nematic (TSN) phase transition. The implications of these results are discussed in terms of the change in sign of one of the Leslie viscosity coefficients and interpreted in the framework of the Ericksen-Leslie Theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 197
Copyright
Copyright © Materials Research Society 1992

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References

1. Wissbrun, K. F., J. Rheol., 25, 619 (1981)Google Scholar
2. Berry, G. C., Mol. Cryst. Liq. Cryst., 165, 333 (1988)Google Scholar
3. Kiss, G. and Porter, R. S., J. Polym. Sci., Polym. Phys. Ed., 18, 361 (1980)CrossRefGoogle Scholar
4. Larson, R. G. and Doi, M., J. Rheol., 35, 539 (1991)Google Scholar
5. Marrucci, G. and Maffettone, P. L., Macromolecules, 22, 4076 (1989)CrossRefGoogle Scholar
6. Gennes, P. G. De, The Physics of Liquid Crystals, Clarendon Press, Oxford (1974)Google Scholar
7. Parodi, O., J. Phys (Paris), 31, 581 (1970)CrossRefGoogle Scholar
8. Chandrasekhar, S. and Kini, U. D., in Polymer Liquid Crystals, Eds., Cifferi, A., Krigbaum, W. R. and Meyer, R. B.., Academic Press, New York (1982), Chapter 8Google Scholar
9. Bhowmik, P. K., Garay, Raul O. and Lenz, R. W., Makromol. Chem, 192, 415 (1991)Google Scholar
10. Srinivasarao, M. and Berry, G. C., J. Rheol., 35, 379 (1991)Google Scholar
11. Leslie, F. M., Arch. Rat. Mech. Anal., 28, 265 (1968)Google Scholar
12. Manneville, P., Mol. Cryst. Liq. Crsyt., 70, 223 (1981)CrossRefGoogle Scholar
13. Jahnig, F. and Brochard, F., J. Phys. (Paris)., 35, 299 (1974)Google Scholar
14. Alderman, N. J. and Mackley, M. R., Farad. Disc. Chem. Soc., 79, 149 (1985)Google Scholar