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Dynamic properties of some polymer nematics were investigated by Freedericksz transition methods in a magnetic field. The linear aromatic polyester, comblike combined side/chain-main/chain polymer and comblike copolymers with mesogenic and functional acid groups in side chains were studied. The temperature dependences of the effective rotation viscosity γ₁* were obtained. At close molecular weight and temperature the γ₁* value for linear polymer exceeds that for comblike combined polymer. Therefore, the existence of side mesogenic groups decreases the velocity of the orientational processes of polymer nematic. However, the highest values of effective rotation viscosity were obtained for the nematic phase of the comblike functionalized copolymers. Hence, the formation of hydrogen bonds in these copolymer leads to slowing of orientational processes. Influence of the intermolecular hydrogen bonds on dynamic properties of functionalized copolymers is stronger than that of intramolecular hydrogen bonds.
Wydawca
Czasopismo
Rocznik
Tom
Strony
63--68
Opis fizyczny
Bibliogr. 17 poz.
Twórcy
autor
- Institute of Macromolecular Compounds of Russian Academy of Sciences, 31 Bolshoi Pr., 199004 St. Petersburg, Russia, afil@mail.macro.ru
Bibliografia
- 1. M. Doi, "Moleeular dynamics and rheological properties of concentrated solutions of rodlike polymers in isotropic and liquid crystalline phases, "J. Polym. Sci., Pol. Phys. Ed. 19, 229-243 (1981).
- 2. N. Kuzuu and M. Doi, "Constitutive equation for nematic liquid crystals under weak viscosity coefficient derived from a molecular kinetic equation. I. Leslie coefficients for rodlike polymers, "J. Phys. Soc. Japan. 52, 3486-3494 (1983).
- 3. P. G. de Gennes, "Mechanical properties of nematic polymers, "in Polymer Liquid Crystal, pp. 115-131, edited by A. Ciferri, W. R. Krigbaum, and R. B. Meyer, Academic Press, New York, London, 1982.
- 4. R. B. Meyer, "Macroscopic phenomena in nematie polymers," in Polymer Liquid Crystal, pp. 133-163, edited by A. Ciferri, W. R. Krigbaum, and R. B. Meyer, Academie Press, New York, London, 1982.
- 5. T. Klein, H. X. Jun, P. Esnault, A. Blumstein, and F. Valino, "Study of the molecular mass dependence of the twist viscosity coefficient of nematic thermotropic main-chain polymer, "Macromolecules 22, 3731-3734 (1989).
- 6. P. Esnault, F. Volino, A. F. Martins, S. Kumar, and F. Blumstain, "The twist viscosity coefficient of main-chain nematic polymer: temperature and molecular mas dependence, "Mol. Cryst. Liq. Cryst. 153, 143-161 (1987).
- 7. P. Esnault, J. P. Casquilho, F. Volino, A. F. Martins, and A. Blumstein, "Reorientational instabilities and viscoelastic measurements in a main chain thermotropic nematic polymer. Optical and NMR studies, "Liq. Cryst. 7, 607-628 (1990).
- 8. V. P. Shibaev, E. B. Barmatov, and L. V. Strogonov, "1H NMR spectroscopic investigation of the dynamic of director rotation in comb-shaped liquid crystal polymers, "in Modern Topics in Liquid Crystals, pp. 73-99, edited by A. Buka, World Scientific, Singapore, 1993.
- 9. C. Casagrande, M. Veyssie, C. Weill, and H. Finkelmann, "Dynamics of Fredericks transition in side chain nematic polymers: determination of the viscoelastic coefficient K1 and y1", Mol. Cryst. Liq. Cryst. Lett. 92, 49-55 (1983).
- 10. W. Rupp, H. P. Grossmann, and B. Stoll, "Measurement of orientational elastic constant and twist viscosity of nematic side chain polymer, "Liq. Cryst. 3, 583-592 (1988).
- 11. A. P. Filippov, L. N. Andreeva, E. B. Barmatov, M. V. Barmatova, S. Grande, F. Kremer, and V. P. Shibaev, "Effect of hydrogen bonds on the order parameter and elastic constants of comb-shaped liquid-crystalline copolymers, "Polymer Sci. A42, 329-329 (2000).
- 12. V. N. Tsvetkov, S. V. Bushin, E. P. Astapenko, N. V. Tsvetkov, S. S. Skorokhodov, V. V. Zuev, R. Zentel, and H. Poths, "Molecular charaeteristic of polymers with mesogenic groups in the backbone and side chain in dilute solutions, "PolymerSci. A36, 813-819 (1994).
- 13. V. N. Tsvetkov, L. N. Andreeva, A. P. Filippov, G. S. Smirnova, S. S. Skorokhodov, and A. Yu. Bilibin, "Elastic deformations of a nematic polymer in a magnetic field, "Polymer Sci. 34, 615-620, 1992.
- 14. L. N. Andreeva, A. P. Filippov, V. N. Tsvetkov, V. V. Zuev, S. S. Skorokhodov, R. Zentel, and H. Poths, "Elastic deformations in a magnetic field of a liquid-crystalline polymer having mesogenic groups in the main and side chains, "Eur. Polym. J. 30, 1461-1465 (1994).
- 15. V. K. Freedericksz and V. V. Zolina, "Forces causing the orientation of an anisotropic liquid, "Trans. Faraday Soc. 29, 919-928 (1933).
- 16. P. Pierancki, F. Brochard, and E. Guyon, "Static and dynamic behaviour of a nematic liquid crystal in a magnetic field. Part II: Dynamics, "J. Phys. 34, 35-48 (1973).
- 17. A. P. Filippov, L. N. Andreeva, V. V. Zuev, and S. S. Skorokhodov, "Dynamics of Freedericksz threshold transition and the rotation viscosity of thermotropic nematic phase of a complex comb-shaped polymer, "Polymer Sci. A43, 495-503 (2001).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA1-0002-0075