Abstract
The effect of the chemical structure and stereogeometry of mesogen on the liquid crystalline properties of thermotropic main-chain polyesters was studied by means of DSC and polarized microscopy for three series of polymers. The polyesters obtained from modified 4,4′-dihydroxybenzophenone (DHBP) and sebacoyl (SEB) or suberoyl (SUB) dichlorides did not exhibit the mesogenic properties. Modification of DHBP in this case consisted in replacement of ketone linkage by between two aromatic rings. The same bisphenol, however, when mixed with another (showing mesogenic behaviour) enhanced the liquid crystalline properties of the copolyesters, namely increasing the temperature range of liquid crystalline phase. The condensation of SEB or SUB with DHBP modified by lateral substitution (at various positions) of one aromatic ring with CH3 group lead to polyesters of lower temperatures of the transition from crystal to nematic phase and mesophase to isotropic liquid, as compared to parent polymers (i.e., polyesters of DHBP+SEB or SUB). Different shifts of those temperatures with the position of substitution have been observed and it was found less pronounced for 3-substituted than 2-substituted bisphenols. Temperature ranges of mesophases also depended on the structure of bisphenols and were broader for 3-substituted DHBP. Therefore, the stereogeometry of the polymer molecules and the bulkiness of their substituents are considered the most important parameters in controlling the mesogenic properties of thermotropic, rigid-flexible polyesters with mesogens incorporated in the main chain.
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A. Blumstein, J. Asrar, and R. B. Blumstein, Liq. Cryst. Ordered Fluids, 4, 311 (1984).
R. W. Lenz and J. I. Jin, Liq. Cryst. Ordered Fluids, 4, 347 (1984).
L. Makaruk and H. Polanska, Liq. Cryst. Ordered Fluids, 4, 154 (1984).
L. Makaruk, H. Polanska, and B. Wazynska, “Polymeric Liquid Crystals,” A. Blumstein Ed., Plenum Publishing Corporation, N. Y., 1985. pp 265—274.
A. Blumstein, S. Vilasagar, S. Ponratham, S. B. Clough, R. B. Blumstein, and G. Maret, J. Polym. Sci., Polym. Phys. Ed., 20, 877 (1982).
S. Antoun, R. W. Lenz, and J. I. Jin, J. Polym. Sci., Polym. Chem. Ed., 19, 1901 (1981).
G. Galli, E. Chiellini, C. Ober, and R. W. Lenz, Makromol. Chem., 183, 2693 (1982).
Q.-F. Zhou and R. W. Lenz, J. Polym. Sci., Polym. Chem. Ed., 21, 3313 (1983).
W. J. Jackson, Br. Polym. J., 12, 154 (1980).
C. Noël, C. Friedrich, F. Laupretre, J. Billard, L. Bosio, and C. Strazielle, Polymer, 25, 363 (1984).
S. Porejko and Z. Wielgosz, Polimery, 13, 55 (1968).
B. Bochwic, “A Textbook of Practical Organic Chemistry,” Polish Scientific Editing Company (PWN), Warsaw, 1975, p 208.
A. T. Carpenter and R. F. Hunter, J. Appl. Chem., 3, 490 (1953).
L. Makaruk, H. Polanska, and E. Ksiezakowska, in preparation.
J. A. Riddick and E. F. Toops, “Organic Solvents—Physical Properties and Methods of Purification in “Techniques of Organic Chemistry,” Vol. VII, A. Weissberger, Ed., Interscience Publishers, Inc., New York, N. Y., 1955.
K. limura, N. Koide, H. Tanabe, and M. Takeda, Makromol. Chem., 182, 2569 (1982).
G. Galli, P. Nieri, C. Ober, and E. Chiellini, Makromol. Chem., Rapid Commun., 3, 548 (1982).
K. Iimura, N. Koide, R. Ohta, and M. Takeda, Makromol. Chem., 182, 2563 (1981).
G. Galli, H. Laus, A. S. Angeloni, P. Ferruti, and E. Chiellini, Makromol. Chem., Rapid Commun., 4, 681 (1982).
W. R. Krigbaum, R. Kotek, T. Ishikawa, and H. Hakemi, Eur. Polym. J., 20, 225 (1984).
C. Ober, J. I. Jin, and R. W. Lenz, Polym. J., 14, 9 (1982).
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Makaruk, L., Polanska, H., Ksiezakowska, E. et al. Preparation and Properties of Thermotropic Mesogenic Polyesters. Polym J 17, 1055–1064 (1985). https://doi.org/10.1295/polymj.17.1055
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DOI: https://doi.org/10.1295/polymj.17.1055