Effect of Electric Fields on the Rheological Properties of the Isotropic Phase of phic/p-Xylene Solutions

Abstract The effect of high ac electric fields upon a liquid crystalline polymer solution, poly(n-hexyl isocyanate) in p-xylene, is examined. The results show that the solutions exhibit an increase in rheological properties proportional to the strength of the field at concentrations well below those exhibiting liquid crystalline behavior. The effects of frequency and field strength are examined as a means to explain this previously unreported phenomenon.

[1]  D. Klingenberg,et al.  The small shear rate response of electrorheological suspensions. II. Extension beyond the point–dipole limit , 1991 .

[2]  M. Srinivasarao.  RHEOLOGY AND RHEO-OPTICS OF POLYMER LIQUID CRYSTALS , 1995 .

[3]  Yuliang Yang,et al.  Loop-like light extinction in the precipitation film of a presheared lyotropic polymeric liquid crystal , 1996 .

[4]  A. D. Shine,et al.  Electrorheology of a nematic poly(n‐hexyl isocyanate) solution , 1992 .

[5]  Akio Inoue,et al.  Relation between molecular structure and electrorheological effects in liquid crystalline polymers , 1997 .

[6]  A. Inoue,et al.  Electrorheological effect of liquid crystalline polymers , 1995 .

[7]  A. Rey,et al.  Shear flows of nematic polymers. I. Orienting modes, bifurcations, and steady state rheological predictions , 1993 .

[8]  V. Shashoua,et al.  THE HOMOPOLYMERIZATION OF MONOISOCYANATES , 1959 .

[9]  S. M. Aharoni.  Rigid backbone polymers. XI. Solution phase‐viscosity relationship , 1980 .

[10]  R. Larson.  Roll‐cell instabilities in shearing flows of nematic polymers , 1993 .

[11]  A. J. Bur,et al.  Intrinsic Viscosity Measurements on Rodlike Poly(n-butyl isocyanate) and Poly (n-octyl isocyanate) , 1973 .

[12]  F. Filisko,et al.  Flow profiles of electrorheological suspensions: An alternative model for ER activity , 1999 .

[13]  J. Hermans.  The viscosity of concentrated solutions of rigid rodlike molecules (poly-γ-benzyl-l-glutamate in m-cresol) , 1962 .

[14]  S. M. Aharoni.  Rigid Backbone Polymers. 2. Polyisocyanates and Their Liquid-Crystal Behavior , 1979 .

[15]  P. Fernandes,et al.  Induction of orientational order in the isotropic phase of a nematic liquid crystal. , 2001, Physical review. E, Statistical, nonlinear, and soft matter physics.

[16]  A. D. Shine,et al.  Two‐dimensional modeling of the electrorheological behavior of liquid crystalline polymer solutions , 1995 .

[17]  ER Suspensions with ER Active Matrix Liquids , 1999 .

[18]  G. Fuller,et al.  Rheo-optical studies of shear-induced structures in semidilute polystyrene solutions , 1997 .

[19]  M. Berger,et al.  Dilute solution viscosity and conformation of poly-n-hexyl isocyanate , 2007 .

[20]  S. M. Aharoni.  Rigid backbone polymers , 1983 .