RELAXATION BEHAVIOR OF SEMIRIGID CHAINS IN THE AMORPHOUS STATE

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dc.contributor.authorCALLEJA, RD
dc.contributor.authorSAIZ, E
dc.contributor.authorRIANDE, E
dc.contributor.authorGARGALLO, L
dc.contributor.authorRADIC, D
dc.date.accessioned2025-01-21T01:35:17Z
dc.date.available2025-01-21T01:35:17Z
dc.date.issued1994
dc.description.abstractDielectric and mechanical behaviour of two polymers having severe restrictions on the conformational versatility of the backbone, namely poly(monocyclohexylmethylene itaconate) (PMCMI) and poly(dicyclohexylmethylene itaconate) (PDCMI), have been studied. Both polymers present a weak glass-rubber relaxation named alpha and two stronger absorptions in the glassy state that, in increasing temperature order, are called beta- and gamma- relaxations. Both mechanical and dielectric beta-peaks are located in the same region of the spectra and have the same activation energy, which suggest that both relaxations are caused by the same molecular mechanisms. The analysis of the dipole moments of both polymers suggest that they behave as freely joint chains as far as their polarity is concerned. The dipolar correlation coefficients in the sub-glass region were calculated by assuming that the dielectric activity is only produced by reorientations of the side groups with respect to the frozen main chains. The fact that the values of the coefficients thus calculated are somewhat larger than the experimental values suggests that dipolar intermolecular interactions cannot be neglected in the analysis of the dielectric behaviour of these polymers.
dc.fuente.origenWOS
dc.identifier.eissn1873-4812
dc.identifier.issn0022-3093
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97662
dc.identifier.wosidWOS:A1994PK61000050
dc.language.isoen
dc.pagina.final989
dc.pagina.inicio985
dc.revistaJournal of non-crystalline solids
dc.rightsacceso restringido
dc.titleRELAXATION BEHAVIOR OF SEMIRIGID CHAINS IN THE AMORPHOUS STATE
dc.typeartículo
dc.volumen172
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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