Fluorescence probe-label methodology for in situ monitoring network forming reactions

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dc.contributor.author Mikes, Frantisek
dc.contributor.author Baselga Llidó, Juan
dc.contributor.author Paz-Abuin, S.
dc.date.accessioned 2017-11-15T11:44:06Z
dc.date.available 2017-11-15T11:44:06Z
dc.date.issued 2002-05
dc.identifier.bibliographicCitation Mikes, F., Baselga, J. & Paz-Abuin, S. (2002). Fluorescence probe–label methodology for in situ monitoring network forming reactions. European Polymer Journal, 38 (12), pp. 2393–2404.
dc.identifier.issn 0014-3057
dc.identifier.uri http://hdl.handle.net/10016/25837
dc.description.abstract The curing of the stoichiometric reaction mixture diglycidyl ether bisphenol A (DGEBA) with N-methylethylenediamine (MEDA) and BEPOX 1268 formulation was monitored by FTIR (in the near IR region) and by fluorescence spectroscopy. 5-Dimethylamino-1-naphthalenesulfonamide derivatives and 4-dialkylamino-4′-nitrostilbene structural units were used as labels and/or probes. It has been proved that hardener in BEPOX 1268 formulation consists of amine containing the primary and secondary amino group. The rate constant for the addition reaction of the secondary amino hydrogen to epoxide is approximately two times larger than that of the primary amino group hydrogen in MEDA and several times (∼seven times) lower in the amine component of BEPOX 1268 formulation. The changes in the integrated fluorescence intensity of the label during the epoxy groups conversion indicate the most important changes in chemical transformations of the reaction mixture, i.e. primary reaction of the secondary amino groups, the gel point (DGEBA–MEDA) and entry of the system to the glassy state (for DGEBA–MEDA and BEPOX 1268). The change in slope of the fluorescence half bandwidth dependence on the epoxy groups conversion indicates the maximum concentration of the secondary amino groups in the reaction mixture (BEPOX 1268). It has been shown that the dependence of the first moment of the emission band vs. epoxy groups conversion can be used to determine the epoxy groups conversion in situ and in real time.
dc.description.sponsorship The authors would like to thank for funding to the European Commission through the BRITE-EuRam project (no. BE97-4472) and to CAM (projects 07N/0002/98 and 3rd Regional Research Programme).
dc.format.extent 12
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.rights © Elsevier, 2002
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.title Fluorescence probe-label methodology for in situ monitoring network forming reactions
dc.type article
dc.subject.eciencia Materiales
dc.subject.eciencia Química
dc.identifier.doi https://doi.org/10.1016/S0014-3057(02)00140-4
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/BE97/4472
dc.relation.projectID Comunidad de Madrid. CAM (07N/0002/1998)
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 2393
dc.identifier.publicationissue 12
dc.identifier.publicationlastpage 2404
dc.identifier.publicationtitle European Polymer Journal
dc.identifier.publicationvolume 38
dc.identifier.uxxi AR/0000010940
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