Low-frequency dielectric relaxation of polyelectrolyte gels

Article Abstract:

Research was conducted to examine the low-frequency dielectric relaxation of polyelectrolyte gels. The poly(sodium 2-acrylamido-2-methylpropanesulfonate) (PNaAMPS) gels were prepared by radical polymerization using potassium persulfate as a radical initiator in the presence of a calculated amount of N,N'-methylenebisacrylamide used as a cross-linking agent. The low-frequency relaxation observed on the gels has been explained in terms of the fluctuation of the bound counterions along the polymer network by crossing through the cross-linking points.

Polyelectrolytes, Dielectric relaxation

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Friction of charged gels

Article Abstract:

The effect of electrostatic repulsion on the friction between two chemically cross-linked polyelectrolyte gels having similar sign of charges was investigated experimentally in pure water and salt solutions. A theoretical model using Poisson-Boltmann equation for evaluating the solvent layer thickness and the Debye-Binkman equation for describing the solvent flow in the gel region was developed. A comparison of the theoretical and experimental values confirmed the essential mechanism proposed by the model.

Friction

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Effect of polymer entanglement on the toughening of double network hydrogels

Article Abstract:

The mechanical strength of double network (DN) gels consisting of highly cross-linked poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) as the first component and linear polyacrylamide (PAAm) as the second component are investigated. The result supports the heterogeneous model, which predicts the presence of 'voids' of the first network PAMPS with a size much larger than the radius of the second polymer PAAm.

Analysis, Crystallization, Mechanical properties, High performance liquid chromatography, Structure, Polyacrylamide

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