RELAXATIONS IN POLY(DI-N-ALKYL AND DIISOALKYL ITACONATES)

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dc.contributor.authorCALLEJA, RD
dc.contributor.authorGARGALLO, L
dc.contributor.authorRADIC, D
dc.date.accessioned2024-01-10T14:21:33Z
dc.date.available2024-01-10T14:21:33Z
dc.date.issued1995
dc.description.abstractA systematic study about the viscoelastic and dielectric relaxations was performed for a family of poli(di-n-alkyl and diisoalkyl itaconates): poly(dimethyl itaconate) (PDMI), poly(diethyl itaconate) (PDEI), poly(di-n-propyl itaconate) (PDPI), poly(di-n-butyl itaconate) (PDBI), poly(diisopropyl itaconate) (PDIPI), and poly(diisobutyl itaconate) (PDIBI). Three dielectric relaxation processes, labeled as alpha, beta, and gamma were observed in all cases. Nevertheless, in some polymers a poor resolution of the peaks is observed and only small indications of the phenomena can be seen. In the case of PDPI and PDBI measurements at very low temperatures were performed and dielectric absorption processes are found at those temperatures. Behavior similar to that observed for dielectric relaxations is found for the mechanical one. The temperature at which the a relaxation, associated with the glass transition temperature, is present diminishes as the length of the n-alkyl side group increases. This behavior is similar to that reported for poly(n-alkyl methacrylates). a relaxation is only detected at some frequencies, and it is more easily detected in terms of E'' or epsilon'' than in terms of tan delta. This relaxation is less pronounced than in the case of poly(n-alkyl methacrylates). An important difference between these polymers and poly(n-alkyl methacrylates) is the existence of a new relaxation process labeled as gamma relaxation between -40 and -120 degrees C. This relaxation is very sensitive to the dryness of the sample or to the presence of molecules of low molecular weight in the matrix.
dc.format.extent7 páginas
dc.fuente.origenWOS
dc.identifier.issn0024-9297
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79703
dc.identifier.wosidWOS:A1995RX35700037
dc.information.autorucQuímica;Gargallo L;S/I;98194
dc.information.autorucQuímica;Radic D;S/I;49367
dc.issue.numero20
dc.language.isoen
dc.nota.accesoSin adjunto
dc.pagina.final6969
dc.pagina.inicio6963
dc.publisherAMER CHEMICAL SOC
dc.revistaMACROMOLECULES
dc.rightsregistro bibliográfico
dc.subjectSUB-GLASS TRANSITIONS
dc.subjectITACONIC ACID-ESTERS
dc.subjectVISCOMETRIC BEHAVIOR
dc.subjectDILUTE-SOLUTION
dc.subjectPOLY(MONOBENZYL ITACONATE)
dc.subjectPOLYMER CONFORMATION
dc.subjectPOLY(MONO-N-ALKYL ITACONATES)
dc.subjectPOLY(METHYL METHACRYLATE)
dc.subjectUNPERTURBED DIMENSIONS
dc.subjectPOLY(ALKYL ITACONATES)
dc.titleRELAXATIONS IN POLY(DI-N-ALKYL AND DIISOALKYL ITACONATES)
dc.typeartículo
dc.volumen28
sipa.codpersvinculados98194
sipa.codpersvinculados49367
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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