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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/36130
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dc.contributor.authorRibeiro, P. A.-
dc.contributor.authorBalogh, D. T.-
dc.contributor.authorFonseca, JLC-
dc.contributor.authorGiacometti, J. A.-
dc.date.accessioned2014-05-20T15:25:47Z-
dc.date.accessioned2016-10-25T18:00:20Z-
dc.date.available2014-05-20T15:25:47Z-
dc.date.available2016-10-25T18:00:20Z-
dc.date.issued2004-04-06-
dc.identifierhttp://dx.doi.org/10.1021/ma035714j-
dc.identifier.citationMacromolecules. Washington: Amer Chemical Soc, v. 37, n. 7, p. 2618-2624, 2004.-
dc.identifier.issn0024-9297-
dc.identifier.urihttp://hdl.handle.net/11449/36130-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/36130-
dc.description.abstractA side-chain methacrylate copolymer functionalized with the nonlinear optical chromophore 4-[N-ethyl-N-(2-hydroxyethyl)]amino-2'-chloro-4'-nitroazobenzene, disperse red-13, was prepared and characterized. The chromophore relaxation was investigated measuring the decay of the electrooptic coefficient r(13) and the complex dielectric constant at different temperatures. Results obtained below and above T-g were analyzed using the Kohlrausch-Williams-Watts(KWW) equation, through the study of the temperature dependence of the KWW parameters. Above T-g the relaxation time experimental data were fitted to the Williams-Landel-Ferry (WLF) equation and its parameters determined. Chromophore relaxation leading to the decrease of electrooptic properties was found associated with a primary alpha relaxation. The obtained WLF equation parameters were introduced into the Adam-Gibbs-Tool-Narayanaswamy-Moynihan equation, and the overall relaxation time temperature dependence was successfully obtained in terms of the fictive temperature, accounting for the sample thermal treatment and allowing optimized thermal treatment to be found. The copolymer KWW stretching parameter at the glass transition temperature lies close to the limit value for short-range interactions, i.e., 0.6, suggesting that the chromophore group is participating in primary a relaxation.en
dc.format.extent2618-2624-
dc.language.isoeng-
dc.publisherAmer Chemical Soc-
dc.sourceWeb of Science-
dc.titleChromophore relaxation in a side-chain methacrylate copolymer functionalized with 4-[N-ethyl-N-(2-hydroxyethyl)]amino-2 '-chloro-4 '-nitroazobenzeneen
dc.typeoutro-
dc.contributor.institutionUniv Nova Lisboa-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Federal do Rio Grande do Norte (UFRN)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv Nova Lisboa, Fac Ciências & Tecnol, Dept Fis, Ctr Fis & Invest Tecnol, P-2829516 Caparica, Portugal-
dc.description.affiliationUniv São Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil-
dc.description.affiliationUniv Fed Rio Grande Norte, Dept Quim, BR-59072970 Natal, RN, Brazil-
dc.description.affiliationUniv Estadual Paulista, Fac Ciência & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciência & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil-
dc.identifier.doi10.1021/ma035714j-
dc.identifier.wosWOS:000220581700041-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofMacromolecules-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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