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Solid State Ordering of Wholly Aromatic Copolyesters of Random Monomer Sequence

Published online by Cambridge University Press:  15 February 2011

J. Blackwell ,
A.-I. Schneider  and
C. M. McCullagh
J. Blackwell
Affiliation:
Department of Macromolecular Science, Case Western Reserve University, Cleveland OH 44106-7202
A.-I. Schneider
Affiliation:
Department of Macromolecular Science, Case Western Reserve University, Cleveland OH 44106-7202
C. M. McCullagh
Affiliation:
Department of Macromolecular Science, Case Western Reserve University, Cleveland OH 44106-7202
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Abstract

X-ray diffraction and computer molecular modeling Methods are being used to investigate the ordering of random sequence copolyesters when cooled for the nematic Melt. Data will be presented for the copolymers prepared from p-hydroxybenzoic acid (HBA) and 6-hydroxy-2-naphthoic acid. The non-periodic diffraction patterns arising from the random monomer sequences are also indicative of the presence of limited three dimensional order. For both polymer systems, we can generate the qualitative feature of the x-ray data using models in which short non-identical segments of 10–12 Monomers on adjacent chains are approximately in register at their center. Molecular Mechanics calculations show that mese non-identical sequences can be packed on the observed hexagonal lattice with only small energy differences when compared to analogous homopolymer structures. Data will also be presented showing how x-ray diffraction can be used to follow transesterification of copoly (HBA/HNA) in the nematic MelL

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 71
Copyright
Copyright © Materials Research Society 1994

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References

1. Olivers, R. A., Blackwell, J., Gutierrez, G. A., Polymer 25, 435 (1984).Google Scholar
2. Blackwell, J., Biswas, A., Gutierrez, G. A., Chivers, R. A., Faraday Discuss. Chem. Soc. 79, 73 (1985).Google Scholar
3. Blackwell, J., Chivers, R. A., Gutierrez, G. A., Biswas, A., J. Macromol. Sci.-Phys. B24 (1–4), 39 (1985).Google Scholar
4. Biswas, A. and Blackwell, J., Macromolccules 21, 3146 (1988);Google Scholar
Biswas, A. and Blackwell, J., Macromolccules 21, 3152 (1988);Google Scholar
Biswas, A. and Blackwell, J., Macromolccules 21, 3158 (1988).Google Scholar
5. Hofmann, D., Schneider, A.I., Blackwell, J., Polymer, submitted for publication.Google Scholar
6. Hanna, S. and Windle, A.H., Polymer 29. 207 (1988)Google Scholar
7. Golombok, R., Hanna, S., Windle, A.H., Mol. Cryst. Liq. Cryst. 155, 281 (1988).Google Scholar
8. Sun, Z., Cheng, H.-M., Blackwell, J., Macromoleculcs 24, 4162 (1991).Google Scholar
9. McCullagh, C.M., Blackwell, J., Jamieson, A.M., Macromolecules, submitted for publication.Google Scholar
10. Demeusc, M. T. and Jaffe, M., Mol. Cryst. Liq. Cryst. Inc. Nonlin. Opt. 157, 535 (1988).Google Scholar
11. Johnson, D.J., Karacan, I., Tomka, J.G., Polymer 31, 8 (1990).Google Scholar
12. Jung, B. and Schurmann, B.L., Makromol. Chem., Rapid Commun. 10, 419 (1989); Macromolecules 22, 477 (1989).Google Scholar
13. Atkins, E.D.T., Thomas, E.L., Lenz, R.W., Mol. Cryst. Liq. Cryst. 155, 263 (1988);Google Scholar
Atkins, E.D.T., Thomas, E.L., Lenz, R.W., Mol. Cryst. Liq. Cryst. 155, 271 (1988).Google Scholar
14. Chin, H.H., Azaroff, A., Lenz, R.W., J. Polym. sci., Polym. Phys. Edn. 27, 1993 (1989);Google Scholar
Chin, H.H., Azaroff, A., Lenz, R.W., J. Polym. sci., Polym. Phys. Edn. 27, 2001 (1989).Google Scholar
15. Gutierrez, G.A., Olivers, R.A., Blackwell, J., Stamatoff, J.B., Yoon, H., Polymer 24, 937 (1983).Google Scholar
16. Blackwell, J., Gutierrez, G.A., Olivers, R.A., Macromolecules 17, 1219 (1984).Google Scholar
17. Yoon, D.Y., Masciocchi, N., Depero, L.E., Viney, C., Parrish, W., Macromolecules 23, 1793 (1990).Google Scholar
18. Lieser, G., J. of Polymer Sci. Phys. Ed. 21, 1611 (1983).Google Scholar
19. Kotliar, A. M., J. Polym. Sci. 16, 367 (1981).Google Scholar
20. Lenz, R. W., Jin, J., Feichtinger, K. A., Polymer 24, 327 (1983).Google Scholar
21. Economy, J., Johnson, R. D., Lyerla, J., Muhlebach, A. in “Liquid Crystalline Polymers,” Weiss, R. A. and Ober, C. K., eds., AMerican Chemical Society, Washington, DC 1990. Chapter 10, “Synthesis and microstructure of Aromatic Copolyesters”Google Scholar
22. Muhlebach, A., Economy, J., Johnson, R. D., Karis, T., Lyerla, J., Macromolecules 23, 1803 (1990).Google Scholar
23. MacDonald, W. A., McLenaghan, A. D. W., McLean, G., Richards, R. W., King, S. M., Macromolecules 24, 6164 (1991).Google Scholar
24. Kugler, J., Gilmer, J. W., Wiswe, D., Zachmann, H.-G., Hahn, K., Fischer, E. W., Macromolecules 20, 116 (1987).Google Scholar
25. Li, M. H., Brulet, A., Keller, P., Strazielle, C., Cotton, J. P., Macromolecules 26, 119 (1993).Google Scholar
26. Troughton, M.J., Unwin, A.P., Davis, G.R., Ward, I.M., Polymer 29, 1389 (1988).Google Scholar
27. McCullagh, C.M., Blackwell, J., Jamieson, A.M., in preparation.Google Scholar