Steady-Shear and Linear-Viscoelastic Material Properties of Model Associative Polymer Solutions

Jenkins, R. D.; Silebi, C. A.; El‐Aasser, M. S.

doi:10.1021/bk-1991-0462.ch013

Cited by 63 publications

(70 citation statements)

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“…A promising class of responsive materials is that of physically cross-linked polymer networks. These transient networks are typically assembled from telechelic polymers [1][2][3][4][5] or linear triblock copolymers, [6][7][8][9] although other architectures have been investigated as well. [10][11][12][13][14] Most widely studied are ABA triblock copolymers with hydrophobic end groups and a hydrophilic middle block.…”

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confidence: 99%

Multiresponsive Reversible Gels Based on Charge‐Driven Assembly

et al. 2010

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Vernetzt: Ein ABA‐Triblock‐Copolymer mit geladenen Endgruppen und ein entgegengesetzt geladener Polyelektrolyt bilden Gele, die auf Änderungen in Konzentration, Temperatur, Ionenstärke, pH‐Wert und Ladungszusammensetzung reagieren. Oberhalb der kritischen Gelbildungskonzentration verbrücken die Triblock‐Copolymere Micellen zu einem probendurchspannenden transienten Netzwerk aus verknüpften Micellen.

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confidence: 99%

Multiresponsive Reversible Gels Based on Charge‐Driven Assembly

et al. 2010

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“…3. 2 In previous studies, p L was assumed to be constant. 19,20) This is equivalent to assuming that loop chains are absent in substance.…”

Section: Resultsmentioning

confidence: 99%

“…1) A typical example of associating polymers is telechelic poly(ethylene oxide) (referred to as PEO hereafter) carrying short hydrophobic end chains at both its ends. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Aqueous solutions of telechelic PEO exhibit shear thickening followed by thinning under certain conditions: 2,3,6,8,[11][12][13]15,16,18) the stationary shear viscosity increases with the shear rate, attains a maximum at a moderate shear rate, and then decreases at a higher shear rate.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nonlinearity Strength in Chain Tension on Shear-Thickening of Associating Polymer Networks

Indei

2007

J. Soc. Rheol., Jpn

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The shear thickening phenomena observed in telechelic associating polymers are studied on the basis of the transient network theory. We investigate how the nonlinearity of the tension along the middle chains affects the stationary shear viscosity of the network under the following conditions: (i) the dissociation rate of the end chains from the network junctions is coupled to the middle-chain tension, and (ii) the generation rate of the chain in a loop conformation is enhanced by the middle-chain tension. A strong nonlinearity in the tension can cause shear thickening if the dissociation rate of the end chains is weakly coupled to the tension. If the nonlinearity of the tension is too strong, however, the dissociation rate is strongly coupled to the tension; moreover, dangling chains tend to be transformed into loop chains rather than bridge chains, thereby leading to shear thinning. The latter effect on the condition for thickening is shown to be small. Thus, the thickening condition is mainly determined by the balance between the nonlinearity strength in the middle-chain tension and the coupling intensity between the dissociation rate and the middle-chain tension.

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“…Their simple and relatively well-defined architecture allows researchers to carry out systematic examination of associating polymers both experimentally 1,2,7,8) and theoretically. 9,10) These works have been providing us important clues for understanding molecular mechanism of chain association and their influence on rheology.…”

Section: Introductionmentioning

confidence: 99%