Magnetization-prepared NMR imaging of water penetration into poly(vinyl alcohol)-poly(N-viny1-2-pyrrolidone) hydrogels

Zainuddin, Strounina, Ekaterina V., Hill, David J. T . and Whittaker, Andrew K. (2010) Magnetization-prepared NMR imaging of water penetration into poly(vinyl alcohol)-poly(N-viny1-2-pyrrolidone) hydrogels. Polymer International, 59 11: 1520-1525. doi:10.1002/pi.2860


Author Zainuddin
Strounina, Ekaterina V.
Hill, David J. T .
Whittaker, Andrew K.
Title Magnetization-prepared NMR imaging of water penetration into poly(vinyl alcohol)-poly(N-viny1-2-pyrrolidone) hydrogels
Formatted title
Magnetization-prepared NMR imaging of water penetration into poly(vinyl alcohol)-poly(N-viny1-2-pyrrolidone) hydrogels
Journal name Polymer International   Check publisher's open access policy
ISSN 0959-8103
Publication date 2010-11
Sub-type Article (original research)
DOI 10.1002/pi.2860
Volume 59
Issue 11
Start page 1520
End page 1525
Total pages 6
Place of publication West Sussex, United Kingdom
Publisher John Wiley & Sons
Collection year 2011
Language eng
Formatted abstract
Poly(vinyl alcohol)–poly(N-vinyl-2-pyrrolidone) (PVA–PVP) polymer network hydrogels were prepared by subjecting an aqueous solution of PVA–PVP to gamma irradiation. The hydrogels had initial water contents of approximately 87%, and upon further immersion in water the hydrogels absorbed significantly more, reaching a final water content of about 95%. The use of magnetization-prepared NMR imaging enabled acquisition of T2-weighted NMR images from which T2 maps were constructed and subsequently instantaneous concentration profiles of water molecules were determined. The concentration profiles could be described using Fick's second law of diffusion and the resultant diffusion coefficients were in excellent agreement with those determined from mass-uptake measurements reported previously. In addition an apparent change in water content over longer times was observed from the NMR images. This phenomenon could be attributed to changes in the distribution of T2 relaxation times due to rearrangement of the water molecules, or alternatively diffusion of non-crosslinked polymer chains out of the hydrogel network.
Copyright © 2010 Society of Chemical Industry
Keyword PVA-PVP hydrogels
Diffusion coefficient
NMR imaging
Relaxation time
T-2 maps
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Special Issue: Dedicated to François Schué

 
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Created: Sun, 05 Dec 2010, 00:02:00 EST