Interaction between water and polymer chains in poly(hydroxyethyl acrylate) hydrogels

Polymer networks of different cross-linking densities were prepared by copolymerisation of hydroxyethyl acrylate and ethylene glycol dimethacrylate. The average molecular weight between cross-links as well as the polymer chain mobility were characterised by means of dynamic-mechanical spectroscopy....

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Bibliographic Details
Published in:Colloid and polymer science 2001-04, Vol.279 (4), p.323-330
Main Authors: MONLEON PRADAS, M, GOMEZ RIBELLES, J. L, SERRANO AROCA, A, GALLEGO FERRER, G, SUAY ANTON, J, PISSIS, P
Format: Article
Language:English
Subjects:
Applied sciences
Chains (polymeric)
Copolymerization
Crosslinking
Density
Exact sciences and technology
Hydrogels
Interaction parameters
Networks
Organic polymers
Physicochemistry of polymers
Polymers
Properties and characterization
Solution and gel properties
Sorption
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Summary:Polymer networks of different cross-linking densities were prepared by copolymerisation of hydroxyethyl acrylate and ethylene glycol dimethacrylate. The average molecular weight between cross-links as well as the polymer chain mobility were characterised by means of dynamic-mechanical spectroscopy. Equilibrium sorption isotherms and the water uptake in immersion in liquid water allowed the determination of the Flory-Huggins interaction parameter between water molecules and polymer chain segments, which decreased with the water activity in the hydrogel and increased with the cross-linking density as a consequence of the hydrophobic character of the cross-linking agent. Dynamic sorption and desorption experiments were used to determine the diffusion coefficient.[PUBLICATION ABSTRACT]
ISSN:0303-402X
1435-1536
DOI:10.1007/s003960000426