Structure evolution of a polymer solution at high shear rates

Kalman Migler; Chu Heng Liu; D. J. Pine

doi:10.1021/ma9510092

Structure evolution of a polymer solution at high shear rates

Kalman Migler, Chu Heng Liu, D. J. Pine

Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

We utilized large angle light scattering to study the structure of a sheared semidilute polymer solution. Below a critical shear rate γ̇_c we observe an enhancement of concentration fluctuations in accordance with previous experimental and theoretical work. Above γ̇_c we find dramatic changes in the transient and steady state scattering behavior which indicate a shear-induced phase separation. A new four-peaked structure which coarsens in time is observed which is superimposed upon the scattering characteristic of low shear. The four-peaked scattering structure evolves into two peaks along the gradient direction, implying the formation of phase-separated domains elongated along the shear direction.

Original language	English (US)
Pages (from-to)	1422-1432
Number of pages	11
Journal	Macromolecules
Volume	29
Issue number	5
DOIs	https://doi.org/10.1021/ma9510092
State	Published - Feb 26 1996

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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AU - Pine, D. J.

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AB - We utilized large angle light scattering to study the structure of a sheared semidilute polymer solution. Below a critical shear rate γ̇c we observe an enhancement of concentration fluctuations in accordance with previous experimental and theoretical work. Above γ̇c we find dramatic changes in the transient and steady state scattering behavior which indicate a shear-induced phase separation. A new four-peaked structure which coarsens in time is observed which is superimposed upon the scattering characteristic of low shear. The four-peaked scattering structure evolves into two peaks along the gradient direction, implying the formation of phase-separated domains elongated along the shear direction.

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Structure evolution of a polymer solution at high shear rates

Abstract

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