Poly(2-hydroxyethyl acrylate) hydrogel confined in a hydrophobous porous matrix

A series of interpenetrated polymer networks (IPNs) in which the first component is a porous poly(ethyl methacrylate) (PEMA) hydrophobic network and the second one is a poly(2-hydroxyethyl acrylate) (PHEA) hydrophilic network were synthesized. Equilibrium sorption isotherms can be reduced to a singl...

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Bibliographic Details
Published in:Colloid and polymer science 2005-03, Vol.283 (6), p.681-690
Main Authors: GALLEGO FERRER, G, SORIA MELIA, J. M, HERNANDEZ CANALES, J, MESEGUER DUENAS, J. M, ROMERO COLOMER, F, MONLEON PRADAS, M, GOMEZ RIBELLES, J. L, PISSIS, P, POLIZOS, G
Format: Article
Language:English
Subjects:
Acrylates
Applied sciences
Confining
Exact sciences and technology
Hydrogels
Interpenetrating networks
Isotherms
Moisture content
Organic polymers
Physicochemistry of polymers
Polymers
Properties and characterization
Solution and gel properties
Sorption
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Summary:A series of interpenetrated polymer networks (IPNs) in which the first component is a porous poly(ethyl methacrylate) (PEMA) hydrophobic network and the second one is a poly(2-hydroxyethyl acrylate) (PHEA) hydrophilic network were synthesized. Equilibrium sorption isotherms can be reduced to a single master curve for all the IPNs when the water absorbed is expressed per gram of PHEA in them. The equilibrium water sorption in immersion is always much smaller than that of pure PHEA. This feature is due to the confining effect of the stiff PEMA matrix. The plasticizing effect of the absorbed water on the PHEA phase was characterized using thermally stimulated depolarization currents, dynamic-mechanical analysis and dielectric relaxation spectroscopy. The results show that the shift of the main relaxation peak towards lower temperatures is unaffected by the presence of the PEMA matrix, and only depends on the water content per gram of PHEA in the IPN.[PUBLICATION ABSTRACT]
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-004-1208-y