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Urethanes and polyurethanes from suberin 2: synthesis and characterization

1999Journal article Open access
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dc.contributor.authorCordeiro, N.
dc.contributor.authorBelgacem, M.N.
dc.contributor.authorGandini, A.
dc.contributor.authorPascoal Neto, C.
dc.date.accessioned2021-05-05T14:31:51Z
dc.date.available2021-05-05T14:31:51Z
dc.date.issued1999
dc.description.abstractPolyurethanes based on suberin from cork of Quercus suber L. and conventional isocyanate monomers were prepared and fully characterized in terms of both structure (FTIR and 1 H NMR spectroscopy) and thermal properties (differential scanning calorimetry and thermogravimetric analysis). Two fractions were systematically isolated, namely (i) methylene-chloride soluble products, which corresponded to linear and branched macromolecules and (ii) methylene-chloride insoluble products, representing the crosslinked material. The structures of these polymers were regular and no appreciable side reactions were detected. DSC analyses provided information about the glass transition temperature of both fractions and this parameter was correlated with the stiffness of the isocyanate used. The TGA of these polyurethanes showed that they started to degrade at about 175°C and that the residue at 400°C was around 50%. The highest amounts of insoluble fractions, as well as the highest Tgs, were reached when an initial [NCO]/[OH] of unity was used.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCordeiro, N., Belgacem, M. N., Gandini, A., & Neto, C. P. (1999). Urethanes and polyurethanes from suberin 2: synthesis and characterization. Industrial Crops and Products, 10(1), 1-10.pt_PT
dc.identifier.doi10.1016/S0926-6690(98)00029-6pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3369
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSuberinpt_PT
dc.subjectCorkpt_PT
dc.subjectQuercus suber L.pt_PT
dc.subjectPolyurethanespt_PT
dc.subjectThermal propertiespt_PT
dc.subjectGlass transitionpt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleUrethanes and polyurethanes from suberin 2: synthesis and characterizationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage10pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleIndustrial Crops and Productspt_PT
oaire.citation.volume10pt_PT
person.familyNamecordeiro
person.givenNamenereida
person.identifier1612636
person.identifier.ciencia-id521A-0F62-EA39
person.identifier.orcid0000-0001-6006-3415
person.identifier.ridO-2253-2019
person.identifier.scopus-author-id7004319456
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication3d02b657-c48c-4f56-813a-1284b81960f3
relation.isAuthorOfPublication.latestForDiscovery3d02b657-c48c-4f56-813a-1284b81960f3

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