Kinetics of photoinduced birefringence in the guest-host system of poly(methyl methacrylate) doped with azobenzene-containing crown ethers

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dc.contributor.authorShimizu, Flavio Makoto
dc.contributor.authorVolpati, Diogo
dc.contributor.authorGiacometti, Jose Alberto
dc.contributor.authorSworakowski, Juliusz
dc.contributor.authorJanus, Krzysztof
dc.contributor.authorLuboch, Elzbieta
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionWroclaw Tech Univ
dc.contributor.institutionGdansk Univ Technol
dc.date.accessioned2014-05-20T15:27:55Z
dc.date.available2014-05-20T15:27:55Z
dc.date.issued2007-07-05
dc.description.abstractThe kinetics of the buildup and decay of photoinduced birefringence was examined in a series of host-guest systems: azobenzene-containing crown ethers, differing in the size of the crowns, dissolved in a poly (methyl methacrylate) matrix. In all samples, the kinetics of the buildup of the birefringence was reasonably described by a sum of two exponential functions, the time constants being inversely proportional to the intensity of the pumping light and the magnitudes of the signals at the saturation level depending on the pumping light intensity and sample thickness. The dark decays were best described by the stretched exponential function, with the characteristic parameters (time constant and stretch coefficient) being practically independent of the type of crown ether. The time constants of the signal decay were orders of magnitude shorter than the respective constants of the dark isomerization of the azo crown ethers, thus indicating that the process controlling the decay was a relaxation of the polymer matrix and/or a rearrangement of the flexible parts of the crowns. (C) 2007 Wiley Periodicals, Inc.en
dc.description.affiliationUniv Estadual Paulista, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationWroclaw Tech Univ, Inst Phys & Theoret Chem, PL-50370 Wroclaw, Poland
dc.description.affiliationGdansk Univ Technol, Fac Chem, PL-80952 Gdansk, Poland
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciências & Tecnol, BR-19060900 Presidente Prudente, SP, Brazil
dc.format.extent130-136
dc.identifierhttp://dx.doi.org/10.1002/app.26105
dc.identifier.citationJournal of Applied Polymer Science. Hoboken: John Wiley & Sons Inc., v. 105, n. 1, p. 130-136, 2007.
dc.identifier.doi10.1002/app.26105
dc.identifier.issn0021-8995
dc.identifier.urihttp://hdl.handle.net/11449/37840
dc.identifier.wosWOS:000246466000015
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofJournal of Applied Polymer Science
dc.relation.ispartofjcr1.901
dc.relation.ispartofsjr0,543
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjecthost-guest systemspt
dc.subjectopticspt
dc.subjectphotochemistrypt
dc.titleKinetics of photoinduced birefringence in the guest-host system of poly(methyl methacrylate) doped with azobenzene-containing crown ethersen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-Blackwell
unesp.author.orcid0000-0003-4370-5492[2]
unesp.author.orcid0000-0002-4833-9893[1]
unesp.author.orcid0000-0001-7205-3791[4]
unesp.author.orcid0000-0003-2372-5509[3]
unesp.author.orcid0000-0002-5391-3140[5]

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