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Two-dimensional Fourier transform rheological study on thermosensitivity of poly(N,N-diethylacrylamide) in aqueous solutions

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Title: Two-dimensional Fourier transform rheological study on thermosensitivity of poly(N,N-diethylacrylamide) in aqueous solutions
Authors: Strandman, Satu1, Lessard, David G.1, van Dusschoten, Dagmar2, Wilhelm, Manfred3, Wood-Adams, Paula M.4, Spiess, Hans W.2, Zhu, X.X.1 julian.zhu@umontreal.ca
Source: Polymer. Sep2012, Vol. 53 Issue 21, p4800-4805. 6p.
Subjects: Acrylamide, Aqueous solutions, Fourier transforms, Phase transitions, Relaxation phenomena, Transition temperature, Strains & stresses (Mechanics)
Abstract: Abstract: The phase transition of a thermo-responsive polymer, poly(N,N-diethylacrylamide) (PDEA) above its critical overlap concentration (c*) has been studied by two-dimensional Fourier transform (FT) rheology using Large Amplitude Step Shear Oscillation (LASSO). This technique allows the separation of the linear and nonlinear contributions to different relaxation processes and the determination of their time scale and amplitude through the time response of the shear stress after step strain experiments. The interchain interactions increase at the onset of the phase transition at 29 °C, indicated by an increased non-linear contribution at short relaxation times as compared to the single phase condition. During the phase separation of a concentrated solution above the phase transition temperature, the polymer-rich phase can form a transient network created by the hydrophobic interactions between the collapsed polymer chains. The non-linear behavior of a phase-separated system well above the transition temperature (at 33 °C) reflects the stretching of the bridging chain segments between larger aggregated domains and the coalescence of aggregates broken during the step in strain. Relaxation time distributions have been fitted in the LASSO spectra by the nonlinear regularization (NLREG) technique and the relaxation times have been attributed with various linear and non-linear processes below and above the phase transition temperature. [Copyright &y& Elsevier]
Copyright of Polymer is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 80181618
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  Data: Two-dimensional Fourier transform rheological study on thermosensitivity of poly(N,N-diethylacrylamide) in aqueous solutions
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  Data: <searchLink fieldCode="JN" term="%22Polymer%22">Polymer</searchLink>. Sep2012, Vol. 53 Issue 21, p4800-4805. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Acrylamide%22">Acrylamide</searchLink><br /><searchLink fieldCode="DE" term="%22Aqueous+solutions%22">Aqueous solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Fourier+transforms%22">Fourier transforms</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Relaxation+phenomena%22">Relaxation phenomena</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+temperature%22">Transition temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink>
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  Data: Abstract: The phase transition of a thermo-responsive polymer, poly(N,N-diethylacrylamide) (PDEA) above its critical overlap concentration (c*) has been studied by two-dimensional Fourier transform (FT) rheology using Large Amplitude Step Shear Oscillation (LASSO). This technique allows the separation of the linear and nonlinear contributions to different relaxation processes and the determination of their time scale and amplitude through the time response of the shear stress after step strain experiments. The interchain interactions increase at the onset of the phase transition at 29 °C, indicated by an increased non-linear contribution at short relaxation times as compared to the single phase condition. During the phase separation of a concentrated solution above the phase transition temperature, the polymer-rich phase can form a transient network created by the hydrophobic interactions between the collapsed polymer chains. The non-linear behavior of a phase-separated system well above the transition temperature (at 33 °C) reflects the stretching of the bridging chain segments between larger aggregated domains and the coalescence of aggregates broken during the step in strain. Relaxation time distributions have been fitted in the LASSO spectra by the nonlinear regularization (NLREG) technique and the relaxation times have been attributed with various linear and non-linear processes below and above the phase transition temperature. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Polymer is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.polymer.2012.08.028
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              Text: Sep2012
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