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New Wholly-Aromatic Thermotropic Polyesters with Controlled Flexibility

Published online by Cambridge University Press:  10 February 2011

Devdatt S. Nagvekar ,
Patrick T. Mather ,
Hong G. Jeon  and
Loon-Seng Tan
Devdatt S. Nagvekar
Affiliation:
Univ. Dayton Research Inst., 300 College Park, Dayton, OH 45469
Patrick T. Mather
Affiliation:
AFR/IMLBP, 2941 P St., Wright Patterson Air Force Base, OH 45433
Hong G. Jeon
Affiliation:
Systran Corp., AFRL/MLBP, 2941 P St., Wright Patterson Air Force Base, OH 45433
Loon-Seng Tan
Affiliation:
AFR/IMLBP, 2941 P St., Wright Patterson Air Force Base, OH 45433
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Abstract

In this work, we present the synthesis and characterization of a new series of wholly-aromatic copolyesters derived from the condensation of various weight fractions of 4,4'-(o- phenylenedioxy)dibenzoic acid (OPDB) and substituted terephthalic acid (BTA) with 2-phenylhydroquinone (PHQ). The Higashi method, involving tosyl chloride and pyridine as solvent, was employed to yield polymer with significant molecular weight. These polymers are intended to enable accessible clearing transition and to control the balance of stiffness and toughness in melt-spun fibers systematically. We report the synthetic details along with characterization of quiescent phase behavior and morphology.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 559: Symposium D – Liquid Crystals Materials and Devices , 1999 , 165
Copyright
Copyright © Materials Research Society 1999

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References

1 Mather, P.T., Romo-Uribe, A., Han, C.D., Chang, S.S., Macromolecules, 30, p. 7977 (1997).Google Scholar
2 In, “Liquid crystallinity in polymers : principles and fundamental properties,” edited by Ciferri, Alberto. New York: VCH Publishers, (1991).Google Scholar
3 Han, H. and Bhowmik, P.K., Prog. Polym. Sci., 22, p. 1431 (1997).Google Scholar
4 Mather, P.T., Sttiber, H.R., Chaffee, K.P., Haddad, T.S., Romo-Uribe, A., and Lichtenhan, J.D., Mat. Res. Soc. Symp. Proc., 425, p. 137 (1997).Google Scholar
5 Nagvekar, D.S., Mather, P.T., Jeon, H.G., and Tan, L.-S., Manuscript in Preparation (1999).Google Scholar
6 Tan, L.-S.; Venkatasubramanian, N., J. Polym. Sci. Part A, Polym. Chem., 34, p. 3539 (1996).Google Scholar
7 Higashi, F. in “New Methods for Polymer Synthesis,” ed. Mijs, W. I., Plenum Press, New York, pg. 112 (1992).Google Scholar
8 Higashi, F., Akiyama, N., Takahashi, I., and Koyama, T., J. Polym. Sci. A: Polym Chem. Ed., 22, p. 1653 (1984).Google Scholar
9 Krigbaum, W.R., Hakemi, H., and Kotek, R., Macromolecules, 18, p. 965 (1985).Google Scholar
10 Dobb, M.G., D.J.Johnson, Saville, B.P., J. Polym. Sci.: Polym. Phys. Ed., 15, p. 2201 (1977).Google Scholar
11 Viney, C., Donald, A.M., Windle, A.H., J. Mater. Sci., 18, p. 1136 (1983).Google Scholar
12 The orientation parameter, <P2>, is measured by azimuthal scanning of the primary reflection and subsequent numerical analysis following, e.g., Haase, W., Fan, Z.X., and Müller, H.J., J. Chem. Phys. 89, p. 3317 (1988).,+is+measured+by+azimuthal+scanning+of+the+primary+reflection+and+subsequent+numerical+analysis+following,+e.g.,+Haase,+W.,+Fan,+Z.X.,+and+Müller,+H.J.,+J.+Chem.+Phys.+89,+p.+3317+(1988).>Google Scholar