A Fluorescence Study on Swelling of Hydrogels (PAAm) at Various Cross-Linker Contents
Loading...
Date
2009
Authors
Aktas, Demet Kaya
Evingür, Gülşen Akin
Pekcan, Önder
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
Disk-shaped acrylamide (AAm) gels were prepared from AAm with various NN'-methylenebisacrylamide (Bis) contents as cross-linker in the presence of ammonium persulfate as an initiator by free-radical cross-linking copolymerization in water. Polyacrylamide (PAAm) gels were dried before using for swelling experiments. Steady-state fluorescence spectrometer was employed during the swelling of PAAm hydrogels in water. Pyranine was introduced as a fluorescence probe. Fluorescence intensity of pyranine from various Bis content gel samples was measured during in situ swelling process. It was observed that fluorescence intensity decreased as swelling has proceeded. Gravimetric and volumetric experiments were also performed. The Li-Tanaka equation was used to determine the swelling time constants tau(c) and cooperative diffusion coefficients D-c from intensity weight and volume variations during the swelling processes. It was observed that swelling time constants tau(c) increased and diffusion coefficients D-c decreased as the cross-linker content was increased. (C) 2010 Wiley Periodicals Inc. Adv Polym Techn 28:215-223 2009
Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.20163
Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.20163
Description
Keywords
Diffusion, Fluorescence, Hydrogels, Swelling
Turkish CoHE Thesis Center URL
Citation
15
WoS Q
N/A
Scopus Q
Q2
Source
Volume
28
Issue
4
Start Page
215
End Page
223