The effect of suppression of offgassing on the rheometry of thermotropic liquid crystalline polymers

Journal of Rheology

Volumn 38, Issue 3, 1994, Pages 617-637

  Giles, David W ^a   Denn, Morton M ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

COPOLYMERS; LIQUID CRYSTAL POLYMERS; MOLTEN MATERIALS; RHEOMETERS; STRAIN; STRUCTURE (COMPOSITION); THERMOTROPIC LIQUID CRYSTALS; VISCOSITY;

COPOLYESTER; FLOW CURVE SHAPE; LYOTROPIC SYSTEMS; OFFGASSING; RHEOMETRY; STRAIN HISTORY; THERMAL HISTORY; THERMOTROPIC LIQUID CRYSTALLINE POLYMERS;

RHEOLOGY;

EID: 0028440423     PISSN: 01486055     EISSN: 15208516     Source Type: Journal    
DOI: 10.1122/1.550478     Document Type: Article

References (35)

1. Alderman, N. J. and M. R. Mackley, “Optical textures observed during the shearing of thermotropic liquid-crystal polymers” Faraday Discuss. Chem. Soc. 79, 149–160 (1985).
2. Amundson, K. R., J. A. Reimer, and M. M. Denn, “Investigation of microstructure in poly[(p-hydroxy benzoic acid)co-(ethylene terephthalate)] using nuclear magnetic resonance spectroscopy” Macromolecules 24, 3250–3260 (1991).
3. Carslaw, H. S. and J. C. Jaeger, Conduction of Heat in Solids, 2nd ed. (Oxford University, 1959), pp. 200 and 201.
4. Cocchini, F., M. R. Nobile, and D. Aciemo, “Transient and steady rheological behavior of the thermotropic liquid crystal copolymer 73/27 HBA/HNA,” J. Rheol. 35, 1171–1189 (1991).
5. De’neve, T., P. Navard, and M. Kleman, “Shear rheology and shear-induced textures of a thermotropic co-poly esteramide” J. Rheol. 37, 515–529 (1993)
6. Doi, M., “Molecular dynamics and rheological properties of concentrated solutions of rodlike polymers in isotropic and liquid crystalline phases,” J. Polym. Sci.: Polym. Phys. Ed. 19, 229–243 (1981).
7. Done, D. and D. G. Baird, “Transient flow of thermotropic liquid crystalline polymers in step strain experiments,” J. Rheol, 34, 749–762 (1990).
8. Done, D. and D. G. Baird, “The effect of thermal history on the rheology and texture of thermotropic liquid crystalline polymers,” Polym. Eng. Sci. 27, 816–822 (1987).
9. Flory, P. J., Principles of Polymer Chemistry (Cornell University, Ithaca, 1953), Chap, VIII.
10. Frankel, N. A. and A. Acrivos, “On the viscosity of a concentrated suspension of solid spheres,” Chem. Eng. Sci. 22, 847–853 (1967).
11. Gaspar-Rosas, A. and G. Paroline, “Effects of sample temperature gradient on rheological measurements” Presented at 64th annual meeting of The Society of Rheology, Santa Barbara, CA (1993).
12. Giles, D. W., “An experimental study of the rheology of thermotropic liquid crystalline copolyesters” Ph.D. thesis, Univ. Calif, at Berkeley (1993).
13. Gotsis, A. D. and D. G. Baird, “Rheological properties of liquid crystalline copolyester melts. II. Comparison of capillary and rotary rheometer results,” J. Rheol. 29, 539–556 (1985).
14. Gotsis, A. D. and D. G. Baird, “Primary normal-stress difference for two liquid crystalline copolyesters,” Rheol. Acta 25, 275–286 (1986).
15. Guskey, S. M. and H. H. Winter, “Transient shear behavior of a thermotropic liquid crystalline polymer in the nematic state,” J. Rheol. 35, 1191–1207 (1991).
16. Hashimoto, T., A. Nakai, T. Shiwaku, H. Hasegawa, S. Rojstaczer, and R. S. Stein, “Small-angle light scattering from nematic liquid crystals; fluctuations of director field due to many-body interactions of disclinations,” Macromolecules 22, 422–429 (1989).
17. Hutton, J. F., “Fracture and secondary flow of elastic liquids,” Rheol. Acta 8, 54–59 (1969).
18. Jerman, R. E. and D. G. Baird, “Rheological properties of copolyester liquid crystalline melts. I. Capillary rheometry,” J. Rheol. 25, 275–292 (1981).
19. Kalika, D. S., D. W. Giles, and M. M. Denn, “Shear and time-dependent rheology of a fully nematic thermotropic liquid crystalline copolymer,” J. Rheol. 34, 139–154 (1990).
20. Kiss, G. and R. S. Porter, “Rheology of concentrated solutions of poly (benzyl-glutamate),” J. Polym. Sci.: Polym. Symp. 65, 193–211 (1978).
21. Kiss, G. and R. S. Porter, “Rheology of concentrated solutions of helical polypeptides,” J. Polym. Sci.; Polym. Phys. Ed. 18, 361–388 (1980).
22. Kromer, H., R. Kuhn, H. Pielartzik, and W. Siebke, “Persistence length and molecular mass distribution of a thermotropic main-chain liquid-crystal polymer,” Macromolecules 24, 1950–1954 (1991).
23. Larson, R. G., “Arrested tumbling in shearing flows of liquid crystal polymers,” Macromolecules 23, 3983–3992 (1990).
24. Larson, R. G. and D. W. Mead, “Time and shear-rate scaling laws for liquid crystal polymers,” J. Rheol. 33, 1251–1281 (1989).
25. Lin, Y. G. and H. H. Winter, “Formation of a high melting crystal in a thermotropic aromatic copolyester”Macromolecules 21, 2439–2443 (1988).
26. Magda, J. J., S. Baek, K. L. DeVries, and R. G. Larson, “Shear flows of liquid crystal polymers: measurements of the second normal stress difference and the Doi molecular theory,” Macromolecules 24, 4460–4468 (1991).
27. Marrucci, G. and P. L. Maffettone, “Description of the liquid-crystalline phase of rodlike polymers at high shear rates,” Macromolecules 22, 4076 (1989).
28. Moldenaers, P. and J. Mewis, “Transient behavior of liquid crystalline solutions of poly(benzylglutamate),” J. Rheol. 30, 567–584 (1986).
29. Moldenaers, P. G. Fuller, and J. Mewis, “Mechanical and optical rheometry of polymer liquid-crystal domain structure,” Macromotecules 22, 960–965 (1989).
30. Moore, R. C. and M. M. Denn, “Magnetic orientation of thermotropic liquid crystalline polymers,” in High Modulus Polymers, edited by A. E. Zachariades and R. S. Porter (Dekker, New York, 1988), p. 169.
31. Nuel, L. and M. M. Denn, “Effect of processing and particulate fillers on the rheology of a nematic polymer melt,” Rheol. Acta 30(1), 65–70 (1991).
32. Onogi, S. and T. Asada, “Rheology and rheo-optics of polymer liquid crystals,” Rheology, edited by G. Astarita, G. Marrucci, and L. Nicolais (Plenum, New York, 1980), Vol. 1, p. 127.
33. Shiwaku, T., A. Nakai, H. Hasegawa, and T. Hashimoto, “Ordered structure of thermotropic liquid-crystal polymers. 1. Characterization of liquid-crystal domain texture,” Macromolecules 23, 1590–1599 (1990).
34. Wissbrun, K. F., “Observations on the melt rheology of thermotropic aromatic polyesters,” Br. Polym. J., 163–169 (Dec. 1980).
35. Wissbrun, K. F., G. Kiss, and F. N. Cogswell, “Flow behavior of a thermotropic liquid crystal aromatic copolyester,” Chem. Eng. Copp. 53, 149–173 (1987).