Dielectric and dynamic-mechanical study of the mobility of poly(t-butylacrylate) chains in diblock copolymers: Polystyrene-b-poly(t-butylacrylate)

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dc.contributor.authorEncinar, Mario
dc.contributor.authorGuzman, Eduardo
dc.contributor.authorProlongo, Margarita G.
dc.contributor.authorRubio, Ramon G.
dc.contributor.authorSandoval, Claudia
dc.contributor.authorGonzalez Nilo, Fernando
dc.contributor.authorGargallo, Ligia
dc.contributor.authorRadic, Deodato
dc.date.accessioned2024-01-10T13:12:20Z
dc.date.available2024-01-10T13:12:20Z
dc.date.issued2008
dc.description.abstractA calorimetric, dielectric and dynamic-mechanical study of the dynamics of the poly(t-butyl acrylate) (PtBa) chains has been carried out in a PtBa homopolymer and two polystyrene (PS)-b-PtBa block copolymers with different PtBa chain lengths. The DSC results show that the size of the cooperative rearranging regions is similar in the homopolymers and the copolymers, both for the PtBa rich- and the PS-rich regions. Therefore, no significant contributions are found arising from composition fluctuations in the copolymers. The relaxation map obtained from dielectric relaxation indicates that there are no differences in the temperature dependence of the a-relaxation of the PtBa block in the three samples studied. However, there are larger differences for the values obtained from DMTA experiments. Contrary to the alpha-relaxation, the relaxation map for the beta-transition shows that the characteristic times for the PtBa blocks are smaller in the homopolymer than in the copolymers. In principle, these are unexpected results because the beta-relaxations have a more local character than the alpha-ones. The width of the alpha-relaxation increases with T for all the samples, and it is slightly larger for the copolymers.
dc.description.abstractThe intensity of the a-relaxation is larger (between 3 and 4 times) for the homopolymer. Considering the molecular weights of the PtBa blocks, this effect has to be ascribed to the existence of frozen amorphous PtBa due to the existence of the glassy PS domains in the microphase separated copolymers. Molecular Dynamic Simulations (MDSs) for different sequences of the polymers under study were carried out. The conformational analysis was carried out between 1000 and 1700 K. The analysis of the variation of angles phi(1) and phi(2) of the ester group of PtBa points out the existence of a correlation between the conformational changes of the side group of the polymer chains and their relaxational behaviour. (c) 2008 Elsevier Ltd. All rights reserved.
dc.description.funderMCyT
dc.description.funderINTERFASES
dc.description.funderFondecyt
dc.description.funderFondecyt for a post-doctoral fellowship
dc.fechaingreso.objetodigital08-04-2024
dc.format.extent9 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.polymer.2008.10.023
dc.identifier.eissn1873-2291
dc.identifier.issn0032-3861
dc.identifier.urihttps://doi.org/10.1016/j.polymer.2008.10.023
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/78172
dc.identifier.wosidWOS:000261734900006
dc.information.autorucQuímica;Gargallo L;S/I;98194
dc.information.autorucQuímica;Radic D;S/I;49367
dc.information.autorucQuímica;Sandoval C;S/I;143938
dc.issue.numero26
dc.language.isoen
dc.nota.accesoContenido parcial
dc.pagina.final5658
dc.pagina.inicio5650
dc.publisherELSEVIER SCI LTD
dc.revistaPOLYMER
dc.rightsacceso restringido
dc.subjectDielectric relaxation
dc.subjectBlock copolymers
dc.subjectClass transition
dc.subjectFREE-ENERGY CALCULATIONS
dc.subjectGLASS-TRANSITION
dc.subjectMOLECULAR MOBILITY
dc.subjectLIGHT-SCATTERING
dc.subjectRELAXATION
dc.subjectFIELD
dc.subjectPHASE
dc.titleDielectric and dynamic-mechanical study of the mobility of poly(t-butylacrylate) chains in diblock copolymers: Polystyrene-b-poly(t-butylacrylate)
dc.typeartículo
dc.volumen49
sipa.codpersvinculados98194
sipa.codpersvinculados49367
sipa.codpersvinculados143938
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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