Deconvolution of the relaxations associated with local and segmental motions in poly(methacrylate)s containing dichlorinated benzyl moieties in the ester residue

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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.accessioned2024-01-10T12:04:50Z
dc.date.available2024-01-10T12:04:50Z
dc.date.issued2005
dc.description.abstractThe relaxation behavior of poly(2,3-dichlorobenzyl methacrylate) is studied by broadband dielectric spectroscopy in the frequency range of 10(-1)-10(9) Hz and temperature interval of 303-423 K. The isotherms representing the dielectric loss of the glassy polymer in the frequency domain present a single absorption, called beta process. At temperatures close to T-g, the dynamical alpha relaxation already overlaps with the beta process, the degree of overlapping increasing with temperature. The deconvolution of the alpha and beta relaxations is facilitated using the retardation spectra calculated from the isotherms utilizing linear programming regularization parameter techniques. The temperature dependence of the beta relaxation presents a crossover associated with a change in activation energy of the local processes. The distance between the alpha and beta peaks, expressed as log(f(max;beta)/f(max;alpha)) where f(max) is the frequency at the peak maximum, follows Arrhenius behavior in the temperature range of 310-384 K. Above 384 K, the distance between the peaks remains nearly constant and, as a result, the alpha onset temperature exhibited for many polymers is not reached in this system. The fraction of relaxation carried out through the alpha process, without beta assistance, is larger than 60% in the temperature range of 310-384 K where the so-called Williams ansatz holds. (c) 2005 American Institute of Physics.
dc.fechaingreso.objetodigital2024-05-03
dc.format.extent9 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1063/1.2013252
dc.identifier.eissn1089-7690
dc.identifier.issn0021-9606
dc.identifier.pubmedidMEDLINE:16392594
dc.identifier.urihttps://doi.org/10.1063/1.2013252
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/75890
dc.identifier.wosidWOS:000232033800053
dc.information.autorucQuímica;Gargallo L;S/I;98194
dc.information.autorucQuímica;Radic D;S/I;49367
dc.issue.numero11
dc.language.isoen
dc.nota.accesoSin adjunto
dc.publisherAMER INST PHYSICS
dc.revistaJOURNAL OF CHEMICAL PHYSICS
dc.rightsregistro bibliográfico
dc.subjectKOHLRAUSCH-WILLIAMS-WATTS
dc.subjectDOMAIN HAVRILIAK-NEGAMI
dc.subjectGLASS-TRANSITION
dc.subjectTEMPERATURE-DEPENDENCE
dc.subjectSUPERCOOLED LIQUIDS
dc.subjectBETA-RELAXATIONS
dc.subjectALPHA
dc.subjectVISCOSITY
dc.subjectDYNAMICS
dc.titleDeconvolution of the relaxations associated with local and segmental motions in poly(methacrylate)s containing dichlorinated benzyl moieties in the ester residue
dc.typeartículo
dc.volumen123
sipa.codpersvinculados98194
sipa.codpersvinculados49367
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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