Abstract
The orientation of the nematic polymer, poly(p-phenylene terephthalamide), in sulfuric acid at 50°C was studied in the Poiseuille flow under an electric field. The critical concentration, c*, as a reference obtained by polarized light microscopy was in the vicinity of 9 wt% (=11.29 vol%). Since the Poiseuille fiow apparatus gave an accurate determination of the Miesowicz viscosity, ηb, it was poissible to determine the order parameters, S, the rotational diffusivity, Dr, the rest of Miesowicz viscosities, ηa and ηc. The magnitude of three viscosities was in the order of ηc>ηa>ηb. Whereas ηa and ηb decreased with dimensionless concentration, ηc exhibited a peculiar form different from the theoretical value. S and Dr increased with dimensionless concentration. These results indicate the effect of tube dilation, that is, when rod-like molecules are oriented in one direction, their motion becomes further freer.
Similar content being viewed by others
Log in or create a free account to read this content
Gain free access to this article, as well as selected content from this journal and more on nature.com
or
References
S. L. Kwolek, U.S. Patent, 3671542 (1972).
H. Biades, U.S. Patent, 3767756 (1973).
D. G. Baird, J. Rheol., 24, 465 (1980).
R. E. Jerman and D. G. Baird, J. Rheol., 25 275 (1981).
M. Doi, J. Polym. Sci., Polym. Phys. Ed., 19, 229 (1981).
M. Doi and S. F. Edwards, J. Chem. Soc., Faraday Trans. 2, 74, 560 (1978).
M. Doi and S. F. Edwards, J. Chem. Soc., Faraday Trans. 2, 74, 918 (1978).
G. Marrucci, Mol. Crystal. Liq. Cryst., 72, 153 (1982).
Y. Toyoshima, N. Minami, and M. Sukigara, Mol. Cryst. Liq. Cryst., 35, 325 (1976).
F. Ozaki, T. Ogita, and M. Matsuo, Macromolecules, 14, 299 (1981).
N. S. Murthy, J. R. Knox, and E. T. Samulski, J. Chem. Phys., 64, 4835 (1976).
A. Abe and T. Yamazaki, Macromolecules, 22, 2145 (1989).
M. L. Sartirana, E. Marsano, E. Bianchi, and A. Cifferi, Macromolecules, 19, 1176 (1986).
A. B. Metzner and G. M. Prilutski, J. Rheol., 30, 661 (1986).
M. Miesowicz, Mol. Cryst. Liq. Cryst., 97, 1 (1983).
A. G. Chmielewski, Mol. Cryst. Liq. Cryst., 132, 339 (1986).
K. Skarp, S. T. Lagerwall, and B. Stebler, Mol. Cryst. Liq. Cryst., 60, 215 (1980).
S. Holmstrom and S. T. Lagerwall, Mol. Cryst. Liq. Cryst., 38, 141 (1977).
N. Kuzuu, M. Doi, J. Phys. Soc. Jpn., 52, 3486 (1983).
N. Kuzuu, M. Doi, J. Phys. Soc. Jpn., 53, 1031 (1984).
L. Onsager, Ann. N.Y. Acad. Sci., 51, 627 (1949).
P. G. de Gennes, “The Physics of Liquid Crystals,” Clarendon Press, Oxford, 1974.
J. R. Schaefgen, T. I. Bair, J. W. Ballou, S. L. Kwolek, P. W. Morgan, M. Panar and J. Zimmerman, “Ultra-High Modulus Polymers,” A. Ciferri and I. M. Ward, Eds., Applied Sci. Publishers, London, 1978, p 173.
M. Arpin and C. Strazielle, Polymer, 18, 591 (1977).
S. Middleman, “Fundamental of Polymer Processing,” McGraw-Hill, New York, 1977.
K. R. Welford and J. R. Sambles, Mol. Cryst. Liq. Cryst., 147, 25 (1987).
Y. C. Lee, M.Ch.E. Thesis, KAIST (1989).
B. C. Kim, S. S. Hwang, and K. U. Kim, Intern. Polym. Proc., 2, 28 (1987).
D. Demus and L. Richter, “Textures of Liquid Crystals,” Verlag Chemie, New York, 1978.
P. J. Flory, Proc. R. Soc. London, Ser., A, 234, 73 (1956).
Y. Onogi and T. Asada, 8th Int. Cong. Rheol., Naples, 1980, Rheology, Vol. 1, G. Astarita, G. Marrucci, and L. Nicolais, Eds., Plenum Press, New York, 1980, p. 127.
P. J. Flory, and G. Ronca, Mol. Cryst. Liq. Cryst., 54, 289 (1979).
M. Doi and S. F. Edwards, “The Theory of Polymer Dynamics,” Clarendon Press, Oxford, 1986.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lee, Y., Huh, J. & Chung, I. Molecular Dynamics and Rheological Properties of Liquid Crystalline Polymer in an Electric Field. Polym J 22, 295–303 (1990). https://doi.org/10.1295/polymj.22.295
Issue date:
DOI: https://doi.org/10.1295/polymj.22.295
