Abstract
Mesogenic diol monomer, terephthaloyl dioxydibenzoic acid diol ester (n=2, 3, 4, 5, 6), were prepared from ω-hydroxyalkyl-4-hydroxybenzoate and terephthalyl chloride, using Schotten–Baumann Reaction. New liquid crystalline polyurethanes (LCPUs) were obtained by solution polymerization mesogenic diol monomers with 4,4′-diphenylmethane diisocyanate (MDI) and 2,4-tolylene diisocyanate (2,4-TDI). The monomer and polyurethanes were investigated by DSC, polarizing microscopy, wide-angle X-ray diffraction (WAXD), small-angle X-ray diffraction (SAXD) and high temperature X-ray diffraction. All LCPUs Synthesized showed a nematic LC nature with wide temperature range.
Similar content being viewed by others
Article PDF
References
H. Finkelmann, H. Ringsdorf, and J. H. Wendorff, Makromol. Chem., 179, 273 (1978).
A. Blumstein, “Liquid Crystalline Polymers,” C. B. Mcardle, Ed., Blackie & Sons Ltd., Glasgow, Scotland, 1989.
International Conference on Liquid Crystal Polymers, Bordeaux, France, July 20—24, 1987.
K. Iimura, N. Koide, H. Tanabe, and M. Takeda, Makromol. Chem., 182, 2569 (1981).
M. Tanaka and T. Nakaya, Advanced in Urethane Science and Technology, 12, 1 (1993).
M. Tanaka and T. Nakaya, International Progress in Urethanes, 6, 62 (1993).
P. J. Stenhouse, E. M. Valles, S. W. Kantor, and W. J. MacKnight, Mocromolecules, 22, 1467 (1989).
M. Tanaka, Makromol. Chem., 187, 2345 (1986).
M. Tanaka and T. Nakaya, J. Macromol. Sci.,-Chem., A24, 777 (1987).
S. K. Pollack, D. Y. Shen, S. L. Hsu, Q. Wang, H. D. Stidham, Macromolecules, 22, 551 (1989).
D. Y. Shen and S. K. Pollack, Macromolecules, 22, 2564 (1989).
G. Smyth, E. M. Valles, S. K. Pollack, J. Grebowicz, P. J. Stenhouse, S. L. Hsu, and W. J. MacKnight, Macromolecules, 23, 3389 (1990).
S. K. Pollack, G. Smyth, F. Papadimitrakopoulos, P. J. Stenhouse, S. L. Hsu, and W. J. MacKnight, Macromolecules, 25, 2381 (1992).
S. K. Pollack, G. Smyth, Polym. Prepr., Am. Chem. Soc., Div. Polym. Chem., 30, 517 (1989).
H. Kothandaraman and A. Sultannasar, J. Macromol. Sci., Pure Chem., A31, 339 (1994).
F. Papadimitrakopoulos, S. L. Hsu, and W. J. MacKnight, Macromolecules, 25, 4671 (1992).
F. Papadimitrakopoulos, E. Sawa, and W. J. MacKnight, Macromolecules, 25, 4682 (1992).
J. B. Lee, T. Kato, T. Yoshida, and T. Uryu, Macromolecules, 26, 4989 (1993).
X. Jia, X. He, and X. Yu, J. Appl. Polym. Sci., 62, 465 (1996).
M. Furukawa, Y. Oda, and H. Higashi, IRC ’95, Kobe, Japan, October 23—27, 1995.
Y. Onouchi, S. Inagaki, H. Okamoto, and J. Furukawa, IRC ’95, Kobe, Japan, October, 23—27, 1995.
J. C. Tang and T. C. Chang, Eur. Polym. J., 30, 1059 (1994).
K. Sugiyama, K. Shiraishi, and K. Kato, Polym. J., 25, 103 (1993).
M. T. Chidade and J. C. M. Boadado, Liquid Crystals, 13, 295 (1993).
H. R. Haridas and G. Radhahrishnan, J. Polym. Sci., Part A, Polym. Chem., 33, 901 (1995).
A. S. Angeloni, M. Laus, E. Chiellini, G. Galli, and O. Francescangeli, Eur. Polym. J., 31, 253 (1995).
E. Chiellini, G. Galli, and S. Trusendi, Mol. Cryst. Liq. Cryst., 243, 135 (1994).
W. Mormann and M. Brahm, Makromol. Chem., 190, 631 (1989).
W. Mormann, Polym. Prepr., Am. Chem. Soc., Div. Polym. Chem., 30, 291 (1989).
W. Mormann, S. Benadda, and M. Brahm, Makromol. Chem. Phys., 196, 543 (1995).
W. Mormann, M. Brahm and S Benadda, “Integration of Fudamental Polymer Science and Technology,” Vol. 5, Elsevier Applied Science, London, 1991, p 219.
W. Mormann and M. Brahm, Polymer, 34, 187 (1993).
W. Mormann and A. Baharifur, Polym. Bull., 24, 413 (1990).
W. Mormann and M. Brahm, Macromolecules. 24, 1096 (1991).
W. Mormann and E. Hohn, Makromol. Chem., 190, 1919 (1989).
M. Sato, F. Komatsu, N, Takeno, and K. Mukaida, Makromol. Chem., Rapid Commun., 12, 167 (1991).
H. R. Kricheldorf and J. Awe, Makromol. Chem., 190, 2597 (1989).
H. R. Kricheldorf and J. Awe, Makromol. Chem., 190, 2579 (1989).
H. R. Kricheldorf and J. Awe, Makromol. Chem., Rapid Commun., 9, 681 (1988).
F. Papadimitrakopoulos, S. W. Kantor, and W. J. MacKnight, Polym. Prepr., Am. Chem. Soc., Div. Polym. Chem., 31, 486 (1990).
S. Trusendi, Thesis, University of Pisa, 1992.
X. Han, B. Zhao, Y. Ni, E. Zhou, and X. Jing, Functional Polym. J., 7, 405 (1994).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lian, Y., Li, M., Zhan, J. et al. Synthesis and Liquid Crystalline Properties of New Thermotropic Polyurethanes. Polym J 31, 1189–1193 (1999). https://doi.org/10.1295/polymj.31.1189
Issue Date:
DOI: https://doi.org/10.1295/polymj.31.1189