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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleRelaxations of poly(methyl methacrylate) probed by covalently attached anthryl groupspt_BR
dc.contributor.authorde Deus, JFpt_BR
dc.contributor.authorSouza, GPpt_BR
dc.contributor.authorCorradini, WApt_BR
dc.contributor.authorAtvars, TDZpt_BR
dc.contributor.authorAkcelrud, Lpt_BR
unicamp.author.emailakcel@onda.com.brpt_BR
unicamp.authorUFPR, Ctr Politecn, LACTEC, Inst Tecnol Desenvolvimento, BR-81531990 Curitiba, Parana, Brazil Ctr Politecn, PIPE, BR-81531990 Curitiba, Parana, Brazil Univ Estadual Campinas, Inst Quim, BR-13084971 Campinas, SP, Brazil UFPR, Ctr Politecn, Dept Quim, BR-81531990 Curitiba, Parana, Brazilpt_BR
dc.subject.wosGlass-transitionpt_BR
dc.subject.wosPoly(n-alkyl Methacrylate)spt_BR
dc.subject.wosDielectric-relaxationpt_BR
dc.subject.wosMultidimensional Nmrpt_BR
dc.subject.wosPolyethylene Filmspt_BR
dc.subject.wosPolymer Mobilitypt_BR
dc.subject.wosBeta-relaxationpt_BR
dc.subject.wosDynamicspt_BR
dc.subject.wosAlphapt_BR
dc.subject.wosCopolymerspt_BR
dc.description.abstractThe molecular relaxations of poly(methyl methacrylate) (PMMA) were studied using three different techniques: DSC, DMTA, which are sensitive to bulk properties, and the variation of fluorescence emission with temperature, a molecular sensitive method. Because this is a nonfluorescent polymer, we synthesized copolymers of methyl methacrylate with several contents of 9-methylanthryl methacrylate. The increase in the spacing between each anthryl group brought about a gradual decrease in T-g of the copolymers, leveling out at about 30-40 PMMA mers, indicating that the minimum spacing to attain the PMMA glass transition was situated in this length range. The fluorescence emission of a copolymer with 98 MMA units interspersed between each chromophoric unit was proved to be mechanically equivalent to PMMA homopolymer and was used to probe macromolecular motions involving shorter segments: apart from the main transitions commonly found for PMMA (alpha and beta), the other two were detected at lower temperatures (gamma and sigma). Apparent activation energies for all relaxations using both techniques are also reported and discussed.pt
dc.relation.ispartofMacromoleculespt_BR
dc.relation.ispartofabbreviationMacromoleculespt_BR
dc.publisher.cityWashingtonpt_BR
dc.publisher.countryEUApt_BR
dc.publisherAmer Chemical Socpt_BR
dc.date.issued2004pt_BR
dc.date.monthofcirculationSEP 7pt_BR
dc.identifier.citationMacromolecules. Amer Chemical Soc, v. 37, n. 18, n. 6938, n. 6944, 2004.pt_BR
dc.language.isoenpt_BR
dc.description.volume37pt_BR
dc.description.issuenumber18pt_BR
dc.description.firstpage6938pt_BR
dc.description.lastpage6944pt_BR
dc.rightsfechadopt_BR
dc.sourceWeb of Sciencept_BR
dc.identifier.issn0024-9297pt_BR
dc.identifier.wosidWOS:000223677600042pt_BR
dc.identifier.doi10.1021/ma049941cpt_BR
dc.date.available2014-11-19T11:27:12Z
dc.date.available2015-11-26T18:02:46Z-
dc.date.accessioned2014-11-19T11:27:12Z
dc.date.accessioned2015-11-26T18:02:46Z-
dc.description.provenanceMade available in DSpace on 2014-11-19T11:27:12Z (GMT). No. of bitstreams: 1 WOS000223677600042.pdf: 120737 bytes, checksum: bb8e5f650334e2fbf0117027e8ae6597 (MD5) Previous issue date: 2004en
dc.description.provenanceMade available in DSpace on 2015-11-26T18:02:46Z (GMT). No. of bitstreams: 2 WOS000223677600042.pdf: 120737 bytes, checksum: bb8e5f650334e2fbf0117027e8ae6597 (MD5) WOS000223677600042.pdf.txt: 33130 bytes, checksum: 256d7f34cc43eeb99ee85d89135686aa (MD5) Previous issue date: 2004en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/70843pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/70843
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/70843-
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