Eur. Phys. J. E (2009) 29: 415-422
https://doi.org/10.1140/epje/i2009-10494-6

Regular Article

Kinetics of water flow through a polymer gel

¹ Institut de Physique Théorique, CEA, IPhT, CNRS, URA 2306, F-91191, Gif-sur-Yvette, France
² Faculty of Engineering, Takushoku University, 193-0985, Hachioji, Tokyo, Japan
³ Department of Physics, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, 812-8581, Fukuoka, Japan

^* e-mail: y-suzuki@la.takushoku-u.ac.jp

Received: 10 July 2008
Revised: 16 March 2009
Accepted: 13 July 2009
Published online: 25 August 2009

Abstract

The water flow through the poly(acrylamide) gel under a constant water pressure is measured by newly designed apparatus. The Young modulus and Poisson’s ratio of the rod shape gels are measured by the uni-axial elongation experiments, which determine the longitudinal modulus independently from the water flow experiments. The time evolution of the water flow in the dilute gel is calculated based on the collective diffusion model of the polymer network coupled with the friction between the polymer network and the water. The calculated results are compared with the time evolution of the flow experiments, and the values of the longitudinal modulus and the friction coefficient are estimated. The estimated values are consistent with the results of our mechanical-response experiments and the light scattering experiments reported previously. We find that the time evolution of the water flow is well described by a single characteristic relaxation time predicted by our model for dilute gels.