Dielectric relaxation investigations in copolyesteramide (Vectra B950) polymer liquid crystal: Thermally stimulated polarization current technique

International Journal of Polymer Analysis and Characterization

Volumn 15, Issue 5, 2010, Pages 298-306

  Quamara, J K ^a   Mahna, S K ^a   Garg, Sanjeev ^a  

^a NATIONAL INSTITUTE OF TECHNOLOGY   (India)

Author keywords

Dielectric relaxations; Polymer liquid crystal; Thermally stimulated polarization currents; Vectra B

Indexed keywords

EID: 77954692330     PISSN: 1023666X     EISSN: 15635341     Source Type: Journal    
DOI: 10.1080/1023666X.2010.493270     Document Type: Article

References (24)

1. Dreher, S., S. Seifert, H. G. Zachmann, N. Moszner, P. Mercoli, and G. Zanghellini. 1998. Chain orientation in melt-extruded samples of Vectra A, Vectra B, and blends in relation to the mechanical properties. J. Appl. Polym. Sci. 67: 531-545.
2. Alfageme, J., J. J. Iruin, and C. Uriarte. 1995. Characterization of acid-base properties of a polyetherimide and two liquid crystalline polymers by inverse gas chromatography. Int. J. Polym. Anal. Charact. 1: 349-363.
3. Chung, T. S., M. Cheng, P. K. Pallathadka, and S. H. Goh. 1999. Thermal analysis of Vectra B950 liquid crystal polymer. Polym. Eng. Sci. 39: 953-962.
4. Vanderschuren, J., and J. Gasiot. 1979. In Thermally Stimulated Relaxation in Solids, ed. P. Braunlich, New York: Springer-Verlag, pp. 135-224.
5. Turnhout, J. van. 1980. In Electrets, ed. G. M. Sessler, New York: Springer-Verlag, pp. 81-216.
6. Quamara, J. K., N. Singh, and A. Singh. 2001. Study of dielectric relaxation processes in poly (p-phenylene sulfide) using a thermally stimulated discharge current technique. Macromol. Chem Phys. 202: 1955-1960.
7. Khemici, M. W., A. Gourari, and M. Bendaoud. 2006. Study of the effect of annealing and physical aging on PVC by the thermally stimulated currents methods. Int. J. Polym. Anal. Charact. 11: 101-114.
8. Khemici, M. W., A. Gourari, and N. Doulache. 2009. Dielectric characterization of poly ethylene naphtalene 2,6 dicarboxylate (PEN) by thermally stimulated currents technique (TSC). Int. J. Polym. Anal. Charact. 14: 322-335.
9. Hong, C. M., and D. E. Day. 1979. Thermally stimulated polarization and depolarization current (TSPC/TSDC) techniques for studying ion motion in glass. J. Mater. Sci. 14: 2493-2499.
10. Ikeda, S., and K. Matsuda. 1982. Thermally stimulated currents in polytetrafluoroethylene in the neighborhood of room temperature transitions. Jpn. J. Appl. Phys. 21: 359-362.
11. Boersma, A., J. van Turnhout, and M. Wubbenhorst. 1998. Dielectric characterization of a thermotropic liquid crystalline copolyesteramide: 1. Relaxation peak assignment. Macromolecules 31: 7453-7460.
12. McKeever, S. W. S., and D. M. Hughes. 1975. Thermally stimulated currents in dielectrics. J. Phys. D Appl. Phys. 8 (13): 1520-1529.
13. Gill-Zambrano, J. L., and C. Juhanz. 1985. In 5th International Symposium on Electrets (ISE 5), Honoring Professor Bernhard Gross: 4-6 September, 1985, Castle of Heidelberg, West-Germany: Proceedings, Piscataway, N.J.: IEEE, p. 235.
14. Bhardwaj, R. P., J. K. Quamara, K. K. Nagpal, and B. L. Sharma. 1983. Field-induced thermally stimulated currents in Kapton-H polyimide films. Phys. Status Solidi A Appl. Mater. Sci. 80: 559-566.
15. Shepard, D. D., and B. Twombly. 1996. Simultaneous dynamic mechanical analysis and dielectric analysis of polymers. Thermochim. Acta 272: 125-129.
16. Jawad, S. A., and M. H. Alhaj-Mohammed. 1992. Dynamic mechanical and dielectric relaxations in liquid crystalline copolymers formed from hydroxynaphthoic acid, terephthalic acid and p-aminophenol. Mater. Lett. 13: 312-317.
17. Sridharbabu, Y., and J. K. Quamara. 2004. TSDC behaviour of pristine and irradiated PET/0.8PHB polymer liquid crystal samples. J. Mater. Sci. 39: 4651-4653.
18. Brostow, W., B. K. Kaushik, S. B. Mal, and I. M. Talwar. 1992. Thermally stimulated depolarization of a copolymer of poly (ethylene terephthalate) and p-hydroxybenzoic acid. Polymer 33: 4687-4692.
19. Arbe, A., J. Colmenero, and D. Richter. 2003. In Broadband Dielectric Spectroscopy, eds. F. Kremer and A. Schonhals, Berlin: Springer-Verlag, pp. 685-707.
20. Singh, R., B. K. Kaushik, and J. K. Quamara. 2008. Investigations of thermally stimulated polarization current in polyetherimide. Indian J. Pure Appl. Phys. 46: 491-501.
21. Lenz, R. W. 1985. Balancing mesogenic and non-mesogenic groups in the design of thermotropic polyesters. Faraday Discuss. 79: 21-32.
22. Quamara, J. K., and Y. Sridharbabu. 2003. Thermally stimulated depolarization current studies in pristine and 100 MeV Ni-ion irradiated PET/0.3 PHB polymer liquid crystal. Indian J. Pure Appl. Phys. 41: 790-800.
23. Shindo, K. 1979. Shiga Univ. Fac. Lib. Arts Educ. Mem. Nat. Sci. 29: 19.
24. Baird, D. G., C. G. Robertson, and J. P. de Souza. 1998. Liquid crystalline polymer reinforced thermoplastic fibers. U.S. Patent 5834560.