Abstract
The orientational dynamics in the isotropic phase of a comb-like nematic polymer with mesogenic and functional side groups is studied using the Kerr effect and dielectric spectroscopy methods. For the first time, it has been found that, in contrast to low-molecular-weight mesogens, the relaxation of the electric birefringence of a melt above the temperature of the nematic–isotropic phase transition in a mesogenic polymer can be represented by a sum of several exponential processes, two of which play a decisive role. These processes replace each other in the temperature range of about 50°C. Dielectric spectroscopy also makes it possible to distinguish two orientational relaxation processes, one of which is due to the rotation of the side mesogenic groups, and the second is associated with the motion of the main chain segments.
Similar content being viewed by others
References
J. Prost and J. R. Lalanne, Phys. Rev. A 8, 2090 (1973).
G. K. L. Wong and Y. R. Shen, Phys. Rev. A 10, 1277 (1974).
E. G. Hanson, Y. R. Shen, and G. K. L. Wong, Phys. Rev. A 14, 1281 (1976).
R. Yamamoto, S. Ishihara, and S. Hayakawa, Phys. Lett. A 69, 276 (1978).
M. A. Agafonov, S. G. Polushin, T. A. Rotinyan, and E. I. Ryumtsev, Sov. Phys. Crystallogr. 31, 310 (1986).
E. I. Ryumtsev, S. G. Polushin, K. N. Tarasenko, and A. P. Kovshik, Zh. Fiz. Khim. 69, 940 (1995).
P. G. de Gennes, Mol. Cryst. Liq. Cryst. 12, 193 (1971).
P. G. de Gennes, Phys. Lett. A 90, 454 (1969).
J. J. Stankus, R. Torre, C. D. Marshall, S. R. Greenfield, A. Sengupta, A. Tokmakoff, and M. D. Fayer, Chem. Phys. Lett. 194, 213 (1992).
M. Eich, K. Ullrich, J. H. Wendorff, and H. Ringsdorf, Polymer25, 1271 (1984).
E. I. Rjumtsev, S. G. Polushin, K. N. Tarasenko, E. B. Barmatov, and V. P. Shibaev, Liq. Cryst. 21, 777 (1996).
Th. Fuhrmann, M. Hosse, I. Lieker, J. Rubner, A. Stracke, and J. H. Wendorff, Liq. Cryst. 26, 779 (1999).
V. Reys, Y. Dormoy, J. Gallani, P. Martinoty, P. LeBarny, and J. Dubois,Phys. Rev. Lett. 61, 2340 (1988).
S. G. Polushin, S. K. Filippov, T. S. Fiskevich, E. B. Barmatov, and E. I. Ryumtsev, Polymer Sci., Ser. C 52, 24 (2010).
E. B. Barmatov, M. V. Barmatova, T. E. Gorokhovskaya, and V. P. Shibaev, Polymer Sci., Ser. A40, 295 (1998).
S. G. Polushin, A. B. Mel’nikov, G. E. Polushina, E. B. Barmatov, V. P. Shibaev, A. V. Lezov, and E. I. Ryumtsev, Polymer Sci., Ser. A43, 511 (2001).
A. A. Istratov and O. F. Vyvenko, Rev. Sci. Instrum. 70, 1233 (1999).
S. Havriliak and S. Negami, Polymer 8, 161 (1967).
R. Diaz-Calleja, Macromolecules 33, 8924 (2000).
R. Zentel, G. R. Strobl, and H. Ringsdorf, Macromolecules 18, 960 (1985).
G. S. Attard, G. Williams, G. W. Gray, D. Lacey, and P. A. Gemmei, Polymer 27, 185 (1986).
K. Araki, Polymer 22, 540 (1990).
N. A. Nikonorova, T. I. Borisova, and V. P. Shibaev, Macromol. Chem. Phys. 201, 226 (2000).
Author information
Authors and Affiliations
Corresponding author
Additional information
Published in Russian in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 110, No. 8, pp. 521–525.
Rights and permissions
About this article
Cite this article
Rogozhin, V.B., Polushin, S.G., Lezova, I.E. et al. Relaxation of the Induced Orientational Order in the Isotropic Phase of a Nematic Polymer. Jetp Lett. 110, 529–532 (2019). https://doi.org/10.1134/S0021364019200104
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0021364019200104