Porous alginate-Ca2+ hydrogels interpenetrated with PNIPAAm networks: Interrelationship between compressive stress and pore morphology

dc.creatorde Moura, MR
dc.creatorGuilherme, MR
dc.creatorCampese, GM
dc.creatorRadovanovic, E
dc.creatorRubira, AF
dc.creatorMuniz, EC
dc.date2005
dc.dateDEC
dc.date2014-11-13T21:21:53Z
dc.date2015-11-26T16:02:29Z
dc.date2014-11-13T21:21:53Z
dc.date2015-11-26T16:02:29Z
dc.date.accessioned2018-03-28T22:51:55Z
dc.date.available2018-03-28T22:51:55Z
dc.identifierEuropean Polymer Journal. Pergamon-elsevier Science Ltd, v. 41, n. 12, n. 2845, n. 2852, 2005.
dc.identifier0014-3057
dc.identifierWOS:000233559000005
dc.identifier10.1016/j.eurpolymj.2005.06.007
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/81436
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/81436
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/81436
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1265077
dc.descriptionThermo-sensitive porous hydrogels composed of interpenetrated networks (IPN) of alginate-Ca2+ and PNIPAAm have been obtained. The hydrogels were prepared by cross-linking alginate-Na+ with Ca2+ ions inside PNIPAAm networks. Compressive tests and scanning electron microscopy were used to evaluate gel strength and pore morphology, respectively. IPN hydrogels displayed two distinct pore morphologies under thermal stimuli. Below 3035 degrees C, the LCST of PNIPAAm in water, IPN hydrogels were highly porous. The pore size of hydrogel heated above LCST became progressively smaller. Alginate-Ca2+ and PNIPAAm hydrogels, used as references, did not present such behaviour, indicating that the porous effect is due to IPN hydrogel. It was verified that higher strength is achieved when the hydrogel presents small pore size and the temperature is increased. It is suggested that at temperatures above LCST, the PNIPAAm chains shrink and pull the alginate-Ca2+ networks back. During shrinking, the polymer chains occupy the open spaces (pores from which water is expelled), and therefore, the hydrogel becomes less deformable when subjected to compressive stress. The results presented in this work indicate that the mechanical properties as well as the pore morphologies of these IPN hydrogels can be tailored by thermal stimulus. (c) 2005 Elsevier Ltd. All rights reserved.
dc.description41
dc.description12
dc.description2845
dc.description2852
dc.languageen
dc.publisherPergamon-elsevier Science Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationEuropean Polymer Journal
dc.relationEur. Polym. J.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectalginate-PNIPAAm
dc.subjectcompression
dc.subjectporous hydrogels
dc.subjectinterpenetrating polymer networks
dc.subjectmorphology
dc.subjectPoly N-isopropylacrylamide
dc.subjectPoly(n-isopropylacrylamide)
dc.subjectRelease
dc.subjectTransition
dc.subjectMembranes
dc.subjectModulus
dc.subjectDensity
dc.subjectWater
dc.subjectGels
dc.titlePorous alginate-Ca2+ hydrogels interpenetrated with PNIPAAm networks: Interrelationship between compressive stress and pore morphology
dc.typeArtículos de revistas


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