Two-stage swelling of acrylamide gels: A photon transmission study


Pekcan O., Kara S.

JOURNAL OF APPLIED POLYMER SCIENCE, vol.82, no.4, pp.894-906, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 82 Issue: 4
  • Publication Date: 2001
  • Doi Number: 10.1002/app.1921.abs
  • Title of Journal : JOURNAL OF APPLIED POLYMER SCIENCE
  • Page Numbers: pp.894-906

Abstract

Acrylamide gels were prepared from acrylamide (AAm) with various N,N'-methylenebis(acrylamide) (Bis) contents by free-radical crosslinking copolymerization (FCC) in water and dried before used for swelling experiments. Photon transmission measurements were performed using a UV-visible (UVV) spectrometer during the swelling of polyacrylamide gels. Transmitted light intensity I-tr increased linearly at very early times when acrylamide gels were immersed in water, then decreased continuously as swelling time increased. The behavior of I-tr was modeled assuming two-stage swelling mechanisms for the swelling acrylamide gels. The increase in I-tr at early times was quantified using a linear diffusion model and a linear relaxation constant ko was measured. The decrease in I-tr was modeled using the Li-Tanaka equation, from which time constants tau (1) and cooperative diffusion coefficients D-0 were determined for acrylamide gels with varying Bis content. (C) 2001 John Wiley & Sons, Inc.