Orthogonal and parallel superposition measurements on lyotropic liquid crystalline polymers

Rheologica Acta

Volumn 39, Issue 1, 2000, Pages 26-37

  Walker, Lynn M ^a   Vermant, Jan ^b   Moldenaers, Paula ^b   Mewis, Jan ^b  

^a CARNEGIE MELLON UNIVERSITY   (United States)

^b UNIVERSITY OF LEUVEN   (Belgium)

Author keywords

Anisotropic viscoelasticity; Flow induced structures; Liquid crystalline polymers; Superposition rheometry

Indexed keywords

ANISOTROPIC MEDIUM; LIQUID-LIQUID MIXING; RHEOLOGY; STRUCTURAL ANALYSIS;

EID: 0034103731     PISSN: 00354511     EISSN: None     Source Type: Journal    
DOI: 10.1007/s003970050004     Document Type: Article

References (47)

1. Alderman NJ, Mackley MR (1985) Optical textures observed during the shearing of thermotropic liquid-crystal polymers. Faraday Discuss Chem Soc 79:149-160
2. Baek SG, Magda JJ, Larson RG (1993) Rheological differences among liquid-crystalline polymers. I. The first and second normal stress differences of PBG solutions. J Rheol 37:1201-1224
3. 1 in densely packed lyotropes and thermotropes, J Rheol 38:1473-1503
4. Booij HC (1966) Influence of superimposed steady shear flow on the dynamic properties of non-Newtonian fluids. Rheol Acta 5:215-221
5. Booij HC (1968) Influence of superimposed steady shear flow on the dynamic properties of non-Newtonian fluids, Rheol Acta 7:202-209
6. Burghardt WR (1991) Oscillatory shear flow of nematic liquid crystals. J Rheol 35:49-62
7. Burghardt WR (1998) Molecular orientation and rheology in sheared lyotropic liquid crystalline polymers. Macromol Chem Phys 99:471-488
8. Burghardt WR, Fuller GG (1991) Role of director tumbling in the rheology of polymer liquid crystal solutions. Macromolecules 24:2546-2555
9. Burghardt WR, Bedford B, Hongladarom K, Mahoney M (1995) Comparison of molecular orientation and rheology in model lyotropic liquid crystalline polymers. In: Nakatani I, Dadmun M (eds) Flow-induced structures in Polymers. ACS Symp Ser 597:308-319
10. De Cleyn G, Mewis J (1981) A constitutive equation for polymer liquids: application to shear flow. J Non-Newtonian Fluid Mech 9:91-105
11. De Nève T. Navard P. Kléman M (1993) Shear rheology and shear-induced textures of a thermotropic copolyesteramide. J Rheol 37:515-529
12. Doi M (1981) 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
13. Donald AM, Viney C, Ritter AP (1986) The parabolic focal conic texture in a lyotropic liquid crystalline polymer. Liq Cryst 1:287-300
14. Gleeson JT, Larson RG, Mead DW, Kiss G, Cladis P (1992) Image analysis of shear-induced textures in liquid crystalline polymers. Liq Cryst 11:341-364
15. Hongladarom K, Burghardt WR (1993) Molecular alignment of polymeric liquid crystals in shear flows. 2. Transient flow behavior in poly(benzyl glutamate) solutions. Macromolecules 26:785-794
16. Hongladarom K, Burghardt WR, Baek SG, Cementwala C, Magda JJ (1993) Molecular alignment of polymeric liquid crystals in shear flows. 1. Spectrographic birefringence technique, steady-state orientation, and normal stress behavior in poly(benzylglutamate) solutions. Macromolecules 26:772-784
17. Jacobsons E, Faitelson LA (1996) Shear flow stability and shear induced texture hierarchy of the liquid crystalline polymers. Compos Mech Design 1:109-120
18. Kiss G, Porter RS (1978) Rheology of concentrated solutions of poly(-γ-benzylglutamate). J Polym Sci Polym Symp 65:193-211
19. Kulichikin VG (1989) Rheology, phase equilibria and processing of lyotropic liquid crystalline polymers. Mol Cryst Liq Cryst 169:51-81
20. Kulichikin V, Tereshin A (1998) Experimental approaches to the investigation of anisotropic viscoelasticity of homo and heterophase polymer systems. In: Klasoh (ed) Proc PPS Europe/Africa region meeting. Gothenburg, Sweden. Polymer Processing Society, p 4.16
21. Kulichikin VG, Volkov V, Tereshin A (1997) Rheology of anisotropic polymer liquids and its role at processing. In: Chenot, Agassant, Montmitonniet, Vergnes, Billon (eds) Proc 1st Esaform Conf Mater forming Sophia-Antipolis, France, vol 1. ESAFORM, pp 401-404
22. Larson RG (1990) Arrested tumbling in shearing flows of liquid crystal polymers. Macromolecules 23:3983-3992
23. Larson RG (1996) On the relative magnitudes of viscous, elastic, and texture stresses in liquid crystalline PBG solutions. Rheol Acta 35:150-159
24. Larson RG, Doi M (1991) Mesoscopic domain theory for textured liquid crystalline polymers. J Rheol 35:539-563
25. Larson RG, Mead DW (1989) Linear viscoelasticity of nematic liquid crystalline polymers. J Rheol 33:185-206
26. Malkin AY, Vasil'eva NV, Belousova TA, Kulichikin VG (1979) Viscosity anisotropy in lyotropic liquid crystals of poly-N-benzamide. Kolloidn Zh 41:200-201
27. Marrucci G, Greco F (1993) Flow behavior of liquid crystalline polymers. Adv Chem Phys 53:331-404
28. Marrucci G, Maffettone PL (1989) Description of the liquid-crystalline phase of rodlike polymers at high shear rates. Macromolecules 22:4076-4082
29. McKenna G, Zapas LJ (1985) The super-position of small deformations on large deformations: measurements of the incremental relaxation modulus for a polyisobutylene solution. Polym Eng Sci 23:1647-1656
30. Mewis J, Moldenaers P (1987) Transient rheological behavior of a lyotropic polymeric liquid crystal. Mol Cryst Liq Cryst 153:291-300
31. Mewis J, Schoukens G (1978) Mechanical spectroscopy of colloidal dispersions. Faraday Discuss Chem Soc 65:58-64
32. Mewis J, Mortier M, Vermant J, Moldenaers P (1997) Experimental evidence for the existence of a wagging regime in polymeric liquid crystals. Macromolecules 30:1323-1328
33. Moldenaers P (1996) Time dependent behavior in lyotropic systems. In: Acierno D. Collyer AA (eds) Rheology and processing of liquid crystal polymers. Chapman and Hall, London, pp 251-287
34. Moldenaers P, Mewis J (1986) Transient behavior of liquid crystalline solutions of poly(benzylclutamate). J Rheol 30:567-584
35. Moldenaers P, Mewis J (1990) Relaxational phenomena and anisotropy in lyotropic polymeric liquid crystals. J Non-Newtonian Fluid Mech 34:359-374
36. Moldenaers P, Mewis J (1993) On the nature of viscoelasticity in polymeric liquid crystals. J Rheol 37:367-368
37. Simmons JM (1966) A servo-controlled rheometer for measurement of the dynamic modulus of viscoelastic liquids. J Sci Instrum 43:887-892
38. Tanner RI, Simmons JM (1967) Combined simple and sinusoidal shear in elastic liquids. Chem Eng Sci 22:1803-1815
39. Tanner RI, Williams G (1971) On the orthogonal superposition of simple shearing and small-strain oscillatory motions. Rheol Acta 10:528-538
40. Vermant J, Moldenaers P, Picken SJ, Mewis J (1994a) Rheology and shear-induced texture of lyotropic liquid crystalline polymers. J Non-Newtonian Fluid Mech 53:1-23
41. Vermant J, Moldenaers P, Mewis J, Picken SJ (1994b) Band formation upon cessation of flow in liquid-crystalline polymers. J Rheol 38:1571-1589
42. Vermant J, Moldenaers P, Mewis J, Ellis M, Garritano R (1997) Orthoganol superposition measurements using a rheometer equipped with a force rebalanced transducer. Rev Sci Instrum 68:4090-4096
43. Vermant J, Walker LM, Moldenaers P, Mewis J (1998) Orthoganol versus parallel superposition measurements. J Non-Newtonian Fluid Mech 79: 173-189
44. Walker LM, Wagner NJ, Larson RG, Miriau PA, Moldenaers P (1995) The rheology of highly concentrated PBLG solutions. J Rheol 39:925-952
45. Walker LM, Mortier M, Moldenaers P (1996) Influence of concentration on the rheology of PBLG solutions. J Rheol 40:967-981
46. Walker LM, Wagner NJ, Kernick WA III (1997) In situ analysis of the defect texture in liquid crystal polymer solutions under shear. Macromolecules 30:508-514
47. Zeegers J, Van den Ende D, Blom C, Altena EG, Beukema AJ Mellema J (1995) A sensitive dynamic viscometer for measuring the complex shear modulus in steady shear flow using the method of orthogonal superposition. Rheol Acta 34:606-621