Evaluation of the polarity of polyamide surfaces using the fluorescence emission of pyrene

dc.creatorBaldi, LDC
dc.creatorIamazaki, ET
dc.creatorAtvars, TDZ
dc.date2008
dc.date2014-11-17T07:52:22Z
dc.date2015-11-26T17:12:11Z
dc.date2014-11-17T07:52:22Z
dc.date2015-11-26T17:12:11Z
dc.date.accessioned2018-03-29T00:00:38Z
dc.date.available2018-03-29T00:00:38Z
dc.identifierDyes And Pigments. Elsevier Sci Ltd, v. 76, n. 3, n. 669, n. 676, 2008.
dc.identifier0143-7208
dc.identifierWOS:000250223300014
dc.identifier10.1016/j.dyepig.2007.01.011
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/66001
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/66001
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/66001
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1281272
dc.descriptionThis paper reports the static and dynamic fluorescence emission of pyrene sorbed onto the surface of 6 different polyamides classified in two categories: AB (polyamide-6 and -11) or AABB (polyamide-6,6, -6,9, -6,10 and -6,12). Pyrene is a well known fluorescent probe for the polarity evaluation of different media for which the ratio of intensities of the vibronic bands (I-1/I-3) decreases in less polar medium and the fluorescence decay from the singlet electronic excited state increases with decreasing polarity. The steady-state vibronic ratio I-1/I-3 of the pyrene fluorescence emission decreases with decreasing polarity for polyamides AB but for polyamides AABB, this ratio undergoes a significant decrease for polyamides-6,9 compared with -6,6 but remains almost constant for polyamides-6,10 and -6,12. This shows that the steady-state fluorescence of pyrene is only sensitive to the polarity of sorption sites whose dimensions are similar to the van der Waals radius of the molecule. In contrast, fluorescence decays decrease with decreasing polarity of the polyamide from tau(F) = 250 ns for polyamide-6,6 to tau(F) = 310 ns for polyamide-6,12 and thus this parameter is always sensitive to the polarity of the medium. We also discuss the advantages of these spectroscopic methodologies that include their applicability to samples without any further sample manipulation and which is independent of their form, powder, pellet or film, and of their thicknesses and sizes. (c) 2007 Elsevier Ltd. All rights reserved.
dc.description76
dc.description3
dc.description669
dc.description676
dc.languageen
dc.publisherElsevier Sci Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationDyes And Pigments
dc.relationDyes Pigment.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectpolyamides
dc.subjectsurface polarity
dc.subjectpyrene
dc.subjectfluorescence spectroscopy
dc.subjectfluorescence decay
dc.subject6,6 Dyeing Process
dc.subjectAcid Blue-45 Dye
dc.subjectDynamic Fluorescence
dc.subjectCationic Surfactants
dc.subjectPolyethylene Films
dc.subjectFree-energy
dc.subjectPart Ii
dc.subjectPolymers
dc.subjectFibers
dc.subjectAdsorption
dc.titleEvaluation of the polarity of polyamide surfaces using the fluorescence emission of pyrene
dc.typeArtículos de revistas


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