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Two‐stage swelling of acrylamide gels: A photon transmission study
Author(s) -
Pekcan Önder,
Kara Selim
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1921
Subject(s) - acrylamide , swelling , polyacrylamide , copolymer , diffusion , polymer chemistry , materials science , relaxation (psychology) , reaction rate constant , fick's laws of diffusion , chemistry , polymer , kinetics , composite material , thermodynamics , social psychology , physics , psychology , quantum mechanics
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 k 0 was measured. The decrease in I tr was modeled using the Li–Tanaka equation, from which time constants τ 1 and cooperative diffusion coefficients D 0 were determined for acrylamide gels with varying Bis content. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 894–906, 2001