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Proceedings Paper

Oscillatory shear rheology of chiral liquid crystal polymers
Author(s): Zhenlu Cui; Qi Wang; Jianbing Su
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Paper Abstract

We employ a hydrodynamic theory for chiral liquid crystal polymers (CLCPs) to investigate the linear viscoelastic response of CLCPs to small amplitude oscillatory permeation shear flow, when the helix is oriented along the velocity direction and the orientation distortion retain the original planar structure. To predict the linear viscoelasticity, we model the system with Stokes hydrodynamic equations with viscous and nematic as well as cholesteric stresses coupled with orientational dynamics driven by the flow. The key findings are the following: in low frequency limit, both the loss modulus (G") and storage modulus (Gi) exhibit a classical frequency ω dependence (G" ∝ ω, Gi ∝ ω2 ) but their magnitudes are of order O(q/Er1/2 ), where 2π/q defines the pitch of the chiral liquid crystal and Er is the Ericksen number. In high frequency limit, Gi = O(q2 /Er) is independent of ω while Gi = O(1)ω is independent of q and Er.

Paper Details

Date Published: 20 October 2009
PDF: 8 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74933F (20 October 2009); doi: 10.1117/12.838580
Show Author Affiliations
Zhenlu Cui, Fayetteville State Univ. (United States)
Qi Wang, Univ. of South Carolina (United States)
Jianbing Su, Xuzhou Normal Univ. (China)

Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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