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Using an Advanced Rheometric Expansion System (ARES), the dynamic viscoelastic behavior of aqueous poly(ethylene oxide) (PEO) solutions with various molecular weights and different concentrations has been investigated in large amplitude oscillatory shear (LAOS) flow fields over a wide range of strain amplitudes. In order to predict the nonlinear viscoelastic behavior of polymer liquids in strain-sweep experiments, a new analysis method including a simple empirical model was proposed and then its validity was thoroughly evaluated in this study. The results have shown that the suggested model is significant in 95% confidence level and predicts exactly the nonlinear viscoelastic behavior of polymer liquids over a whole range of strain amplitudes tested. The strain limits of linear viscoelastic response and nonlinear behavior indices were determined using this model to estimate the LAOS flow behavior in strain-sweep experiments. The master curves of strain limits and nonlinear behavior indices can be obtained by representing these data against the product of angular frequency by characteristic time. The LAOS flow behavior of polymer systems with various molecular weights and different concentrations can well be predicted from these master curves.
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참고문헌 (48)
참고문헌 신청
K. S. Cho. / 2005 / A Geometrical Interpretation of Large Amplitude Oscillatory Shear Response / J. Rheol 49:747~758
S. Höfl. / 2006 / Effect of Large Amplitude Oscillatory Shear(LAOS)on the Dielectric Response of 1, 4-cis-Polyisoprene / Polymer 47:7282~7288
J. A. Yosick. / 1997 / A Kinetic Network Model for Nonlinear Flow Behavior of Molten Plastics in both Shear and Extension / J. Non-Newt. Fluid Mech 70:103~123
W. Philippoff / 1954 / Further Dynamic Investigation on Polymers / J. Appl. Phys 25:1102~1107
K. W. Song. / 1996 / Rheological Characterization of Aqueous Poly(Ethylene Oxide)Solutions(I) : Limits of Linear Viscoelastic Response and Nonlinear Behavior with Large Amplitude Oscillatory Shear Deformation / J. Kor. Fiber Soc 33:1083~1093
S. Höfl. / 2006 / Effect of Large Amplitude Oscillatory Shear(LAOS)on the Dielectric Response of 1, 4-cis-Polyisoprene / Polymer 47:7282~7288
J. A. Yosick. / 1997 / A Kinetic Network Model for Nonlinear Flow Behavior of Molten Plastics in both Shear and Extension / J. Non-Newt. Fluid Mech 70:103~123
W. Philippoff / 1954 / Further Dynamic Investigation on Polymers / J. Appl. Phys 25:1102~1107
K. W. Song. / 1996 / Rheological Characterization of Aqueous Poly(Ethylene Oxide)Solutions(I) : Limits of Linear Viscoelastic Response and Nonlinear Behavior with Large Amplitude Oscillatory Shear Deformation / J. Kor. Fiber Soc 33:1083~1093
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