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dc.contributor.authorCarsi, M.-
dc.contributor.authorSanchis, M. J.-
dc.contributor.authorDíaz-Calleja, Ricardo-
dc.contributor.authorRiande, Evaristo-
dc.contributor.authorNugent, M. J. D.-
dc.identifier.citationMacromolecules 45 (8) : 3571–3580 (2012)es_ES
dc.description.abstractThe dielectric relaxation spectra of poly(2-ethoxyethyl methacrylate) in the frequency domain exhibits above Tg and at high frequencies a well-developed secondary γ relaxation. This process is followed in decreasing order of frequency for a relatively weak β relaxation and an ostensible glass−rubber relaxation which at high temperatures and low frequencies is dominated by electrode−polymer interfacial processes. By slightly cross-linking the polymer using 2.5% (mol) of 2- ethoxyethyldimethacrylate as cross-linking agent, the β relaxation disappears, the γ relaxation remaining. The activation energy of the γ relaxation for the cross-linked and un-cross-linked polymers is ca. 30 kJ·mol−1, about 10 kJ·mol−1 below that of the β relaxation. Cross-linking shifts the location of the glass−rubber relaxation nearly 10 °C to higher temperatures, without widening the distribution of relaxation times. The X-rays pattern of the cross-linked polymer presents two peaks at q = 5.6 nm−1 and 12.76 nm−1, resembling the X-ray patterns of poly- (n-alkyl methacrylate)s. The peaks in poly(n-alkyl methacrylate)s were attributed to the formation of nanodomains integrated by side chains flanked by the backbone. However, whereas this heterogeneity produces an αPE peak in poly(n-alkyl methacrylate)s with n ≥ 2, this microheterogeneity gives rise to a Maxwell−Wagner−Sillars (MWS) relaxation in the cross-linked polymer located at lower frequencies than the glass rubber relaxation. Finally the interfacial-electrode conductive processes of the crosslinked and un-cross-linked polymeric systems are studied in the light of current theories.es_ES
dc.description.sponsorshipWe thank Dr. J. Guzman for providing us the CEOEMA sample. This work was financially supported by the DGCYT and CAM through the Grant MAT2008-06725-C03.es_ES
dc.publisherAmerican Chemical Societyes_ES
dc.titleEffect of Cross-Linking on the Molecular Motions and Nanodomains Segregation in Polymethacrylates Containing Aliphatic Alcohol Ether Residueses_ES
dc.description.peerreviewedPeer reviewedes_ES
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