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• W2028822571 abstract "In this article we demonstrated that the viscosities of modified poly (acrylic acid) (PAA) solutions were tunable by modulating the hydrophobic and inclusion association between alkyl groups and β-cyclodextrin (β-CD) groups grafted to PAA. The viscosity can be controlled by changing the host–guest molar ratio, alkyl chain length, polymer concentration, salt concentration, pH value, temperature, or addition of native β-CD. A viscosity maximum for inclusive polymer networks constructed by mixing hydrophobically modified PAA (HMPAA) and β-CD–modified PAA (β-CDPAA) appeared at the alkyl : β-CD molar ratio of 1:1, which implies the inclusion association between HM and β-CD grafts is binary. Longer side chain length or higher polymer concentration led to higher viscosity for aqueous HMPAA solution with only hydrophobic association or its mixture with β-CDPAA with inclusion association. Monotonically increasing the ionic strength or pH value resulted in a viscosity maximum due to the competition between electrostatic repulsion and hydrophobic or inclusive association. The hydrophobic interactions of alkyl groups could be masked by native β-CD, and the networks of HMPAA and β-CDPAA mixture deconstructed upon addition of native β-CD molecules. The storage modulus and loss modulus of hydrophobic HMPAA and inclusive HMPAA + β-CDPAA solutions obey time–temperature superposition. The horizontal and vertical temperature shift factors obeyed a simple-exponential Arrhenius relationship, where the activation energies for hydrophobic association system were found to be 3.4 and − 12.1 kJ/mol, and for inclusive association system 53.9 and − 2.9 kJ/mol, respectively. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd." @default.
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• W2028822571 date "2009-05-14" @default.
• W2028822571 modified "2023-09-25" @default.
• W2028822571 title "Rheology control by modulating hydrophobic and inclusive associations of side-groups in poly (acrylic acid)" @default.
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• W2028822571 doi "https://doi.org/10.1002/apj.279" @default.
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