Abstract
Thermotropic liquid crystalline copoly(ester-imide)s were synthesized from n-(ω-carboxyalkylene) trimellitic imide, 2,6-dihydroxynaphthalene, and p-hydroxybenzoic acid. The synthesized polymers were abbreviated as PEIM, CPHA, CPHB, CPHC, and CPHD, corresponding to mole fractions of p-hydroxybenzoic acid (PHB) to PEIM varied from 0 to 1/3, 1/2, 2/3, and 3/4. We investigated the monomeric sequence distributions by high resolution 13C NMR and their effects on the thermal, viscoelastic properties and molecular orientation of copoly(ester-imide)s. The solids of CPHA and CPHB with short runs of PHB blocks in a main chain preserved a nematic glassy state during the cooling process because of the slow crystallization. The low degree of crystallinity and slow crystallization rate were considered to be caused by the absence of long runs of PHB blocks. But CPHC with long runs of PHB blocks showed a high tendency to crystallize and, therefore, the hysteresis of viscoelastic properties in heating and cooling was observed. The residual crystallites of CPHC were considered to hinder the molecular orientation during melt spinning.
Similar content being viewed by others
Article PDF
References
K. F. Wissbrun, Br. Polym. J., 163 (1980).
F. N. Cogswell, Br. Polym. J., 170 (1980).
D. Done and D. G. Baird, Polym. Eng. Sci., 27, 816 (1987).
D. Done and D. G. Baird, Polym. Eng. Sci., 30, 989 (1990).
T. Masuda, K. Fujiwara, and M. Takahashi, Intl. Polym. Processing, 6, 225 (1991).
S. Kalika, M. R. Shen, X. M. Yu, M. M. Denn, P. Lanneli, N. Masciocchi, D. Y. Yoon, W. Parrish, C. Freiedrich, and C. Nöel, Macromolecules, 23, 5192 (1990).
K. F. Wissbrun and A. C. Griffin, J. Polym. Sci., Polym. Phys. Ed., 20, 1835 (1982).
A. Blumstein, O. Thomas, and S. Kumar, J. Polym. Sci., Polym. Phys. Ed., 24, 27 (1986).
S. S. Kim and C. D. Han, Macromolecules, 26, 3176 (1993).
P. Driscoll, K. I. Fujiwara, T. Masuda, A. Furukawa, and R. W. Lenz, Polym. J., 20, 351 (1988).
S. Hayase, P. Driscoll, and T. Masuda, Polym. Eng. Sci., 33 108 (1993).
P. Driscoll, S. Hayase, and T. Masuda, Polym. Eng. Sci., 34, 519 (1994).
P. Driscoll, T. Masuda, A. Furukawa, R. W. Lenz, and S. Bhattacharya, Polym. J., 22, 609 (1990).
P. Driscoll, T. Masuda, and K. Fujiwara, Macromolecules, 24, 1567 (1991).
Y. G. Lin and H. H. Winter, Macromolecules, 21, 2439 (1988).
Y. G. Lin and H. H. Winter, Macromolecules, 24, 2877 (1991).
K. Huang, Y. G. Lin, and H. H. Winter, Polymer, 33, 4533 (1992).
D. S. Kalika, D. W. Giles, and M. M. Denn, J. Rheol., 34, 139 (1990).
A. Mühlebach, R. D. Johhson, J. Lerla, and J. Economy, Macromolecules, 21, 3115 (1988).
A. Zachariades, E. J. Economy, and J. A. Logan, J. Appl. Polym. Sci., 27, 2009 (1982).
E. Joseph, G. L. Wilks, and D. G. Baird, Polymer, 26, 689 (1985).
H. R. Kricheldorf and R. Pakull, and Buchner, J. Polym. Sci., Part A: Polym. Chem., 27, 431 (1989).
S. Hanna and A. H. Windle, Polymer, 29, 207 (1988).
S. Hanna, A. Romo-Uribe, and A. H. Windle, Nature, 366, 546 (1993).
A. Biswas and J. Blackwell, Macromolecules, 21, 3146 (1988).
G. C. Levy, R. L. Lichter, and G. L. Nelson, “Carbon-13 Nuclear Magnetic Resonance Spectroscopy,” Wiley-Interscience, New York, N.Y., 1980.
S. K. Kwon and I. J. Chung, Eur. Polym. J., 30, 1081 (1994).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kim, T., Kim, K. & Chung, I. Effects of Monomeric Sequence Distributions on Physical Properties of Thermotropic Liquid Crystalline Copoly(ester-imide)s. Polym J 29, 85–94 (1997). https://doi.org/10.1295/polymj.29.85
Issue Date:
DOI: https://doi.org/10.1295/polymj.29.85
Keywords
This article is cited by
-
Microstructural lattice simulation and transient rheological behavior of a flow-aligning liquid crystalline polymer under low shear rates
Korean Journal of Chemical Engineering (2001)