alpha-beta splitting region in the dielectric relaxation spectrum of PEA-PEMA sequential IPNs

Kyritsis, A; Ribelles, JLG; Duenas, JMM; Campillo, NS; Ferrer, GG; Pradas, MM

dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Ribelles, JLG	en
dc.contributor.author	Duenas, JMM	en
dc.contributor.author	Campillo, NS	en
dc.contributor.author	Ferrer, GG	en
dc.contributor.author	Pradas, MM	en
dc.date.accessioned	2014-03-01T01:53:52Z
dc.date.available	2014-03-01T01:53:52Z
dc.date.issued	2004	en
dc.identifier.issn	0024-9297	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/27132
dc.subject.classification	Polymer Science	en
dc.subject.other	INTERPENETRATING POLYMER NETWORKS	en
dc.subject.other	DYNAMIC GLASS-TRANSITION	en
dc.subject.other	CROSSOVER REGION	en
dc.subject.other	METHACRYLATE)	en
dc.subject.other	SPECTROSCOPY	en
dc.subject.other	TEMPERATURE	en
dc.subject.other	BLENDS	en
dc.title	alpha-beta splitting region in the dielectric relaxation spectrum of PEA-PEMA sequential IPNs	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The dielectric relaxation spectra of poly(ethyl acrylate)-i-poly(ethyl methacrylate) sequential interpenetrating polymer networks, IPNs, are presented. In addition, dynamic-mechanical data were used to study the compatibility of the networks as the main relaxation predominates on the secondary relaxation in mechanical spectroscopy. When the IPNs are highly cross-linked, both networks are forced to mix at the molecular level, and as a consequence, a single main dynamic mechanical relaxation appears. By contrast, when the cross-linking density is small, the individual relaxation behavior of the component networks can be observed. The poly(ethyl methacrylate) networks with low cross-linking density show the merging of the secondary beta dielectric relaxation and the main alpha relaxation with the same characteristics as the poly(ethyl methacrylate) chain polymer. This behavior changes, however, in the highly cross-linked network in which the influence of the main relaxation on the overall behavior is smaller, and it was not possible to separate the alpha and beta components in the merging region. The incorporation of the poly(ethyl acrylate) chains to the cooperative motions of the poly(ethyl methacrylate) network shifts the alpha and beta relaxations to a different extent, which induces changes in the shape of the spectrum in the merging zone.	en
heal.publisher	AMER CHEMICAL SOC	en
heal.journalName	MACROMOLECULES	en
dc.identifier.isi	ISI:000188383100032	en
dc.identifier.volume	37	en
dc.identifier.issue	2	en
dc.identifier.spage	446	en
dc.identifier.epage	452	en