Journal ArticleDOI
Rheo‐optical studies on aligned nematic solutions of a rodlike polymer
Mohan Srinivasarao,Guy C. Berry +1 more
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In this paper, the shear deformation of well-aligned nematic solutions of the rod-like poly (1,4phenylene•2,6•benzobisthiazole), PBT, was studied using a conoscopic microscopy.Abstract:
Rheo‐optical studies on shear deformation of well‐aligned nematic solutions of the rodlike poly (1,4‐phenylene‐2,6‐benzobisthiazole), PBT, are reported. Conoscopic microscopy was used to follow the director during shear, and during relaxation on cessation of flow. The results show that the molecules are not homogeneously aligned in shearing flow. Rather, various complex director field distortions may occur, depending on the relative orientation of the initial director to the flow direction. The results are compared quantitatively with predictions based on the Ericksen–Leslie constitutive equation for nematic fluids.read more
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Dynamical phenomena in liquid-crystalline materials
Alejandro D. Rey,Morton M. Denn +1 more
TL;DR: In this article, the authors present a recent progress in modeling and simulation of the flow of nematic liquid crystals using the Leslie-Ericksen (LE) theory and the Doi theory.
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Development of orientation and texture during shearing of liquid-crystalline polymers
TL;DR: In this article, the development of orientation and texture during slow shearing of liquid-crystalline solutions of poly(γ-benzyl-L-glutamate) was studied using polarizing microscopy.
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Electrorheology of a nematic poly(n‐hexyl isocyanate) solution
I‐Kuan Yang,Annette D. Shine +1 more
TL;DR: In this paper, the shear flow behavior of a unidomain nematic solution of poly(n−hexyl isocyanate) (PHIC) subjected to an electric field was studied experimentally in a parallel plate rotational rheometer.
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The Ericksen number and Deborah number cascades in sheared polymeric nematics
R. G. Larson,D. W. Mead +1 more
TL;DR: In this article, a sequence of transitions with increasing Ericksen number analogous to that observed in small molecule tumbling nematics was observed in liquid crystalline poly(γ-benzyl-glutamate) solutions.