Molecular orientation of a commercial thermotropic liquid crystalline polymer in simple shear and complex flow

Rheologica Acta

Volumn 44, Issue 5, 2005, Pages 446-456

  Burghardt, Wesley R ^a   Brown, Eric F ^a   Auad, Maria Lujan ^b   Kornfield, Julia A ^b  

^a Northwestern University   (United States)

^b California Institute of Technology   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

SHEAR FLOW;

EID: 20344363153     PISSN: 00354511     EISSN: None     Source Type: Journal    
DOI: 10.1007/s00397-004-0424-1     Document Type: Article

References (41)

1. Bedford BD, Burghardt WR (1996) Molecular orientation of a liquid-crystalline polymer solution in mixed shear-extensional flows. J Rheol 40:235-257
2. Beekmans F, Gotsis AD, Norder B (1996) Transient and steady-state rheological behavior of the thermotropic liquid crystalline polymer Vectra B950. J Rheol 40:947-966
3. Beekmans F, Gotsis AD, Norder B (1997) Influence of the flow history on stress growth and structure changes in the thermotropic liquid crystalline polymer Vectra B950. Rheol Acta 36:82-95
4. Burghardt WR (1998) Molecular orientation and rheology in sheared lyotropic liquid crystalline polymers. Macromol Chem Phys 199:471-488
5. Caputo FE, Burghardt WR (2001) Real-time 1-2 plane SAXS measurements of molecular orientation in liquid crystalline polymers. Macromolecules 34:6684-6694
6. Caputo FE, Burghardt WR, Berret J-F (1999) Tumbling dynamics in a nematic surfactant solution in transient shear flows. J Rheol 43:765-779
7. Caputo FE, Ugaz VM, Burghardt WR, Berret J-F (2002) Transient 1-2 plane SAXS measurements of micellar orientation in aligning and tumbling nematic surfactant solutions. J Rheol 46:927-946
8. Chang S, Han CD (1997) A thermotropic main-chain random copolyester containing flexible spacers of differing lengths. 2. Rheological behavior. Macromolecules 30:1656-1669
9. Cinader DK, Burghardt WR (1999a) X-ray scattering studies of orientation in channel flows of a lyotropic liquid crystalline polymer. Polymer 40:4169-4180
10. Cinader DK, Burghardt WR (1999b) X-ray scattering studies of orientation in channel flows of a thermotropic liquid-crystalline polymer. J Polym Sci B Polym Phys 37:3411-3438
11. Cinader DK, Burghardt WR (2000) Molecular orientation in channel flows of main-chain thermotropic liquid crystalline polymers. Rheol Acta 39:247-258
12. Dadmun MD, Clingman S, Ober CK, Nakatani AI (1998) Flow-induced structure in a thermotropic liquid crystalline polymer as studied by SANS. J Polym Sci B Polym Phys 36:3017-3023
13. AM Donald AH Windle 1992 Liquid crystalline polymers Cambridge University Press Cambridge
14. Ericksen JL (1960) Anisotropic fluids. Arch Rat mech Anal 4:231-237
15. Gervat L, Mackley MR, Nicholson TM, Windle AH (1995) The effect of shear on thermotropic liquid-crystalline polymers. Philos Trans Roy Soc A 350:1-27
16. Gillmor JR, Colby RH, Hall E, Ober CK (1994) Viscoelastic properties of a model main-chain liquid crystalline polymer. J Rheol 38:1623-1638
17. Han CD, Chang S, Kim SS (1994) Rheological behavior of thermotropic liquid-crystalline polymers - effect of thermal and deformation histories. Mol Cryst Liq Cryst 254:335-368
18. Han CD, Ugaz VM, Burghardt WR (2001) Shear stress overshoots in flow inception of semiflexible thermotropic liquid crystalline polymers: experimental test of a parameter-free model prediction. Macromolecules 34:3642-3645
19. Hongladarom K, Burghardt WR (1993) Molecular alignment of polymer liquid crystals in shear flow. 2. Transient flow behavior in poly(benzyl glutamate) solutions. Macromolecules 26:785-794
20. Hongladarom K, Secakusuma V, Burghardt WR (1994) Relation between molecular orientation and rheology in lyotropic hydroxypropylcellulose solutions. J Rheol 38:1505-1523
21. 1 and tumbling in a liquid crystal polymer. J Rheol 43:31-50
22. Kim SS, Han CD (1993) Transient rheological behavior of a thermotropic liquid-crystalline polymer. 1. The startup of shear flow. J Rheol 37:847-866
23. Kim DO, Han CD, Mather PT (2000) Optical and mechanical rheometry of semiflexible main-chain thermotropic liquid-crystalline polymers with varying pendant groups. Macromolecules 33:7922-7930
24. RG Larson 1998 The structure and rheology of complex fluids Oxford University Press New York 10-11
25. Leslie FM (1979) Theory of flow phenomena in liquid crystals. Adv Liq Cryst 4:1-81
26. Lin HG, Winter HH (1991) High-temperature recrystallization and rheology of a thermotropic liquid-crystalline polymer. Macromolecules 24:2877-2882
27. Long D, Morse DC (2000) Linear viscoelasticity and director dynamics of nematic liquid crystalline polymer melts. Europhys Lett 49:255-261
28. Maffettone PL, Marrucci G (1992) The nematic dumbbell model. J Rheol 36:1547-1561
29. Mather PT, Jeon HG, Han CD, Chang S (2000) Morphological and rheological responses to shear startup and flow reversal of thermotropic liquid-crystalline polymers. Macromolecules 33:7594-7608
30. Mewis J, Moldenaers P (1987) Transient rheological behavior of a lyotropic polymeric liquid-crystal. Mol Cryst Liq Cryst 153:291-300
31. Moldenaers P, Mewis J (1990) Relaxational phenomena and anisotropy in lyotropic polymeric liquid crystals. J Non Newt Fluid Mech 34:359-374
32. Rendon S, Burghardt WR, New A, Bubeck RA (2004) Effect of complex kinematics on the molecular orientation distribution in injection molding of liquid crystalline copolyesters. Polymer 45:5341-5352
33. Romo-Uribe A, Windle AH (1996) "Log-rolling" alignment in main-chain thermotropic liquid crystalline polymer melts under shear: An in-situ WAXS study. Macromolecules 29:6246-6255
34. Romo-Uribe A, Windle AH (1999) A rheo-optical and dynamic X-ray-scattering study of flow-induced textures in main-chain thermotropic liquid crystalline polymers. The influence of molecular weight. Proc Roy Soc Lond A Mat 455:1175-1201
35. Semenov AN (1987) Rheological properties of a nematic solution of semiflexible macromolecules. Sov Phys JETP 66:712-716
36. Srinivasarao M, Garay RO, Winter HH, Stein RS (1992) Rheo-optical properties of a thermotrip liquid-crystalline polymer. Mol Cryst Liq Cryst 223:29-39
37. Ugaz VM, Burghardt WR (1998) In situ x-ray scattering study of a model thermotropic copolyester under shear: Evidence and consequences of flow-aligning behavior. Macromolecules 31:8474-8484
38. Ugaz VM, Burghardt WR, Zhou W, Kornfield JA (2001) Transient molecular orientation and rheology in flow aligning thermotropic liquid crystalline polymers. J Rheol 45:1029-1063
39. Vaish N, Cinader DK, Burghardt WR, Zhou W, Kornfield JA (2001) Molecular orientation in quenched channel flow of a flow aligning main chain thermotropic liquid crystalline polymer. Polymer 42 10147-10153
40. Zhou W, Kornfield JA, Ugaz VM, Burghardt WR, Link DR, Clark NA (1999) Dynamics and shear orientation behavior of a main-chain thermotropic liquid crystalline polymer. Macromolecules 32:5581-5593
41. Zhou W, Kornfield JA, Burghardt WR (2001) Shear aligning properties of a main chain thermotropic liquid crystalline polymer. Macromolecules 34 3654-3660