Viscoelasticity of radiation-formed PVA/PVP hydrogel

Zainuddin, A., Cooper-White, J. J. and Hill, D. J. T. (2002) Viscoelasticity of radiation-formed PVA/PVP hydrogel. Journal of Biomaterials Science-polymer Edition, 13 9: 1007-1020. doi:10.1163/156856202760319153


Author Zainuddin, A.
Cooper-White, J. J.
Hill, D. J. T.
Title Viscoelasticity of radiation-formed PVA/PVP hydrogel
Journal name Journal of Biomaterials Science-polymer Edition   Check publisher's open access policy
ISSN 0920-5063
Publication date 2002
Sub-type Article (original research)
DOI 10.1163/156856202760319153
Volume 13
Issue 9
Start page 1007
End page 1020
Total pages 14
Place of publication Zeist
Publisher Vsp Bv
Collection year 2002
Language eng
Subject C1
250502 Physical Chemistry of Macromolecules
780103 Chemical sciences
Abstract The dynamic theological behaviour of gamma-irradiated 12.8 wt% poly(vinyl alcohol) (PVA), 12.8 wt% poly(vinyl pyrrolidone) (PVP), and a blend of 8 wt% PVA and 4.8 wt% PVP aqueous solutions have been studied pre- and post-gelation. The non-irradiated solutions displayed theological behaviour typical of dilute to semi-dilute polymer solutions, with the complex viscosity being independent of the frequency and shear rate (i.e. Newtonian behaviour) over the range of frequencies tested and the loss modulus G(omega) and storage modulus G(omega) being nearly proportional to omega and omega(2) respectively. After a set of doses of gamma-radiation, the magnitudes of the dynamic moduli G'(omega) and G(omega) increased as the absorbed dose increased, with notable differences between the two homopolymers and the blend. The stages of gelation were effectively monitored by means of dynamic theological measurements, allowing the possible mechanisms of network formation to be elucidated. The doses required for gelation of the PVA, PVP, and blend samples, determined on the basis of the Winter and Chambon criteria for gelation, were found to be 12 kGy for the 12.8 wt% PVA, 4 kGy for the 12.8 wt% PVP, and 5 kGy for the 8 wt% PVA/4.8 wt% PVP solutions. The unexpected lower gelation dose demonstrated by the blend sample, compared with predictions based on the blend composition, and the associated gelation mechanism are also discussed.
Keyword Engineering, Biomedical
Materials Science, Biomaterials
Polymer Science
PVA
PVP
Gamma Irradiation
Hydrogel
Theology
Gelation
Viscoelastic Behaviour
Cross-linking And Network
Polycaprolactone Critical Gels
Intermolecular Cross-linking
Polymer Concentration
Polyvinyl-alcohol
Molecular-weight
Aqueous-solution
Point
Dependence
Temperature
Irradiation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Tue, 14 Aug 2007, 17:34:33 EST