Micromorphology and relaxation processes of low density polyethylene probed by fluorescence spectroscopys

dc.creatorVigil, MR
dc.creatorBravo, J
dc.creatorBaselga, J
dc.creatorYamaki, SB
dc.creatorAtvars, TDZ
dc.date2003
dc.dateFEB
dc.date2014-11-17T04:11:32Z
dc.date2015-11-26T16:37:44Z
dc.date2014-11-17T04:11:32Z
dc.date2015-11-26T16:37:44Z
dc.date.accessioned2018-03-28T23:20:54Z
dc.date.available2018-03-28T23:20:54Z
dc.identifierCurrent Organic Chemistry. Bentham Science Publ Ltd, v. 7, n. 3, n. 197, n. 211, 2003.
dc.identifier1385-2728
dc.identifierWOS:000180496700001
dc.identifier10.2174/1385272033373021
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/56735
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/56735
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/56735
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1272102
dc.descriptionFluorescence spectra of molecular guests at several temperatures are useful technique to study several types of polymer properties. In particular, it has been often employed to study polymer relaxation processes either in static or in dynamic conditions. In this work some applications of the steady-state fluorescence spectroscopy of different guests in polyethylene and in particular reports the photophysical behavior of 1,3-di(1-pyrenyl)propane (1Py(3)1Py) sorbed in low density polyethylene are shown. This molecular probe differs of pyrene by its ability to form intramolecular excimer species and we discuss the temperature dependence of this formation. In this study we recorded simultaneously the fluorescence spectra and the differential scanning calorimetry (dsc) traces. The relative dependence of fluorescence intensities on temperature of the higher energy vibronic band at 367 nm, of the isolated choromophore emission and of the excimer emission were discussed and associated with the polyethylene polymer relaxation processes. The influence of the macroscopic stretching upon the polymer relaxation processes and the fluorescence emission was also investigated and compared with previous results.
dc.description7
dc.description3
dc.description197
dc.description211
dc.languageen
dc.publisherBentham Science Publ Ltd
dc.publisherHilversum
dc.publisherHolanda
dc.relationCurrent Organic Chemistry
dc.relationCurr. Org. Chem.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectAttached Anthryl Groups
dc.subjectBeta-relaxation
dc.subjectMechanical Relaxations
dc.subjectSecondary Relaxations
dc.subjectExcimer Fluorescence
dc.subjectAlpha-relaxations
dc.subjectChain Dynamics
dc.subjectBulk Polymers
dc.subjectFilms
dc.subjectPhotoluminescence
dc.titleMicromorphology and relaxation processes of low density polyethylene probed by fluorescence spectroscopys
dc.typeArtículos de revistas


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