Influence of the fine structure on the response of polymer chains to perturbation fields

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dc.contributor.authorDominguez Espinosa, G
dc.contributor.authorDiaz Calleja, R
dc.contributor.authorRiande, E
dc.contributor.authorGargallo, L
dc.contributor.authorRadic, D
dc.date.accessioned2024-01-10T12:39:46Z
dc.date.available2024-01-10T12:39:46Z
dc.date.issued2006
dc.description.abstractThe relaxation behavior of poly(3-methylbenzyl methacrylate), poly(3-fluorobenzyl methacrylate), and poly(3-chlorobenzyl methacrylate) was thoroughly studied by broadband dielectric spectroscopy with the aim of investigating the influence of slight differences in chemical structure on the response of polymers to electric perturbation fields. Retardation spectra calculated from dielectric isotherms utilizing linear programming regularization parameter techniques were used to facilitate the deconvolution of strongly overlapped absorptions. Above the glass transition temperature, the spectra of the two halogenated polymers present a secondary gamma process well separated from a prominent peak resulting from the overlapping of the alpha and beta relaxations. The spectra of poly(3-methylbenzyl methacrylate) exhibit at long times a well-developed alpha absorption followed in decreasing order of time by two weak absorptions, named beta and gamma, whose intensities increase with temperature. The temperature dependence of the distance of the a peak from the beta and gamma peaks, expressed in terms of log(f(max,beta)/f(max,alpha)) and log(f(max,gamma)/f(max,alpha)), respectively, is studied. The Williams ansatz and the extended ansatz give a fairly good account of the relaxation behavior of the polymers. The stretch exponent associated with the a relaxation increases with temperature from ca. 0.2 at low temperatures to the vicinity of 0.5 at high temperatures. At low temperatures, the alpha relaxation is described by a Vogel-type equation, but at high temperature the beta and alpha processes are roughly described by the same Arrhenius equation. In the whole temperature range, the activation energy they relaxation is significantly lower than that of the beta absorption. The mechanisms involved in the development of the secondary relaxations are qualitatively discussed.
dc.fechaingreso.objetodigital2024-04-23
dc.format.extent10 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1021/ma052381c
dc.identifier.eissn1520-5835
dc.identifier.issn0024-9297
dc.identifier.urihttps://doi.org/10.1021/ma052381c
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/77233
dc.identifier.wosidWOS:000236996200046
dc.information.autorucQuímica;Gargallo L;S/I;98194
dc.information.autorucQuímica;Radic D;S/I;49367
dc.issue.numero8
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final3080
dc.pagina.inicio3071
dc.publisherAMER CHEMICAL SOC
dc.revistaMACROMOLECULES
dc.rightsacceso restringido
dc.subjectGLASS-TRANSITION
dc.subjectBETA-RELAXATION
dc.titleInfluence of the fine structure on the response of polymer chains to perturbation fields
dc.typeartículo
dc.volumen39
sipa.codpersvinculados98194
sipa.codpersvinculados49367
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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