Stress Relaxation in Linear Polymer Solutions after Stepwise Decrease of Shear Rate

Yoshiaki Takahashi; Yoshinobu Isono; Ichiro Noda; Mitsuru Nagasawa

doi:10.1021/ma00167a026

Stress Relaxation in Linear Polymer Solutions after Stepwise Decrease of Shear Rate

Yoshiaki Takahashi, Yoshinobu Isono, Ichiro Noda, Mitsuru Nagasawa

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

10 Citations (Scopus)

Abstract

Shear stress relaxation in linear polystyrene solutions after a stepwise decrease of shear rate from a value of γ₁ to a lower value γ₂was observed with an R-17 Weissenberg rheogoniometer. The experimental results in the region of low shear rates agreed well with the theory of linear viscoelasticity. In nonlinear regions, it was found that the initial parts of the relative relaxation curves compose a single line independent of γ₂ if γ₁is kept constant. The behavior is consistent with that of stress development after a stepwise increase of shear rate, reported previously. It was concluded that the quasi-network structure of polymer solutions has a stability and the structure change occurs with a time lag.

Original language	English
Pages (from-to)	153-156
Number of pages	4
Journal	Macromolecules
Volume	20
Issue number	1
DOIs	https://doi.org/10.1021/ma00167a026
Publication status	Published - Jan 1 1987
Externally published	Yes

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma00167a026

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abstract = "Shear stress relaxation in linear polystyrene solutions after a stepwise decrease of shear rate from a value of γ1 to a lower value γ2was observed with an R-17 Weissenberg rheogoniometer. The experimental results in the region of low shear rates agreed well with the theory of linear viscoelasticity. In nonlinear regions, it was found that the initial parts of the relative relaxation curves compose a single line independent of γ2 if γ1is kept constant. The behavior is consistent with that of stress development after a stepwise increase of shear rate, reported previously. It was concluded that the quasi-network structure of polymer solutions has a stability and the structure change occurs with a time lag.",

author = "Yoshiaki Takahashi and Yoshinobu Isono and Ichiro Noda and Mitsuru Nagasawa",

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T1 - Stress Relaxation in Linear Polymer Solutions after Stepwise Decrease of Shear Rate

AU - Takahashi, Yoshiaki

AU - Isono, Yoshinobu

AU - Noda, Ichiro

AU - Nagasawa, Mitsuru

PY - 1987/1/1

Y1 - 1987/1/1

N2 - Shear stress relaxation in linear polystyrene solutions after a stepwise decrease of shear rate from a value of γ1 to a lower value γ2was observed with an R-17 Weissenberg rheogoniometer. The experimental results in the region of low shear rates agreed well with the theory of linear viscoelasticity. In nonlinear regions, it was found that the initial parts of the relative relaxation curves compose a single line independent of γ2 if γ1is kept constant. The behavior is consistent with that of stress development after a stepwise increase of shear rate, reported previously. It was concluded that the quasi-network structure of polymer solutions has a stability and the structure change occurs with a time lag.

AB - Shear stress relaxation in linear polystyrene solutions after a stepwise decrease of shear rate from a value of γ1 to a lower value γ2was observed with an R-17 Weissenberg rheogoniometer. The experimental results in the region of low shear rates agreed well with the theory of linear viscoelasticity. In nonlinear regions, it was found that the initial parts of the relative relaxation curves compose a single line independent of γ2 if γ1is kept constant. The behavior is consistent with that of stress development after a stepwise increase of shear rate, reported previously. It was concluded that the quasi-network structure of polymer solutions has a stability and the structure change occurs with a time lag.

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Stress Relaxation in Linear Polymer Solutions after Stepwise Decrease of Shear Rate

Abstract

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