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Influence of chitin nanocrystals on the dielectric behaviour and conductivity of chitosan-based bionanocomposites

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Influence of chitin nanocrystals on the dielectric behaviour and conductivity of chitosan-based bionanocomposites

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dc.contributor.author	Salaberría, A.M.
dc.contributor.author	Teruel-Juanes, Roberto
dc.contributor.author	Badia Valiente, José David
dc.contributor.author	Fernandes, S.C.M.
dc.contributor.author	Sáenz de Juano-Arbona, V.
dc.contributor.author	Labidi, J.
dc.contributor.author	Ribes Greus, A.
dc.date.accessioned	2019-11-12T08:33:59Z
dc.date.available	2020-10-20T04:45:06Z
dc.date.issued	2018
dc.identifier.citation	Salaberría, A.M. Teruel-Juanes, Roberto Badia Valiente, José David Fernandes, S.C.M. Sáenz de Juano-Arbona, V. Labidi, J. Ribes Greus, A. 2018 Influence of chitin nanocrystals on the dielectric behaviour and conductivity of chitosan-based bionanocomposites Composites Science and Technology 167 323 330
dc.identifier.uri	https://hdl.handle.net/10550/72169
dc.description.abstract	A series of bionanocomposite films based on chitosan, reinforced with chitin nanocrystals, were developed, and assessed in terms of dielectric behaviour and conductivity by using an experimental methodology that allows avoiding the conductivity contribution and the exclusion of contact and interfacial polarization effects. The dielectric relaxations at low and high frequency and temperatures were modeled by Havriliak-Negami functions. Below the glass transition temperature (Tg), the γ and β relaxations were observed, which were related to intramolecular and non-cooperative segmental movements. At higher temperatures, an intermolecular and cooperative macromolecular movement, related to the glass transition, gave rise to α-relaxation. In addition, two over-Tg ρI and ρII relaxations were found, which were related to the displacement of dipoles in the disordered structure of bionanocomposites. The addition of chitin nanocrystals did not affect the apparent activation energy Ea of the γ-relaxation. However, it decreased the Ea of the β-relaxation and increased the free volume at temperatures in the vicinities of the α-relaxation. Finally, the electric conductivity of the bionanocomposites was lower than that of neat chitosan and chitin due to the interaction between the OH and NH2 groups that reduced the ionic mobility, along with the increase of free volume, with the subsequent separation of phases.
dc.language.iso	eng
dc.relation.ispartof	Composites Science and Technology, 2018, vol. 167, p. 323-330
dc.subject	Ciència dels materials
dc.subject	Solucions polimèriques
dc.title	Influence of chitin nanocrystals on the dielectric behaviour and conductivity of chitosan-based bionanocomposites
dc.type	journal article	es_ES
dc.date.updated	2019-11-12T08:33:59Z
dc.identifier.doi	10.1016/j.compscitech.2018.08.019
dc.identifier.idgrec	132229
dc.embargo.terms	24 months
dc.rights.accessRights	open access	es_ES