Electrical conductivity of an all-natural and biocompatible semi-interpenetrating polymer network containing a deep eutectic solvent
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https://doi.org/10.1039/D0GC02274H |
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Título
Electrical conductivity of an all-natural and biocompatible semi-interpenetrating polymer network containing a deep eutectic solventAutoría
Fecha de publicación
2020-07-29Editor
Royal Society of ChemistryCita bibliográfica
GACHUZ, Edwin J., et al. Electrical conductivity of an all-natural and biocompatible semi-interpenetrating polymer network containing a deep eutectic solvent. Green Chemistry, 2020, vol. 22, no 17, p. 5785-5797.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.rsc.org/en/content/articlelanding/2020/gc/d0gc02274h#!divAbstractVersión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
A series of semi-interpenetrating polymer networks (semi-IPNs) consisting of crosslinked poly(itaconic
acid) in the presence of the polysaccharide inulin were prepared by free-radical polymerization, taking
advantage ... [+]
A series of semi-interpenetrating polymer networks (semi-IPNs) consisting of crosslinked poly(itaconic
acid) in the presence of the polysaccharide inulin were prepared by free-radical polymerization, taking
advantage of the chemistry of deep eutectic systems (DESs). Up to 14 wt% of the polysaccharide inulin
readily dissolves in a nonaqueous DES composed of glycerol (Gly) and choline chloride (ChCl). On the
other hand, itaconic acid (IA) mixed with ChCl formed a deep eutectic solvent (DES) monomer, which
upon free-radical polymerization in solution aided by multifunctional acrylates allowed the synthesis of
highly crosslinked polymer networks. Bringing together both DESs, the DES monomer containing IA and
the inert one containing inulin dissolved in it, allowed the synthesis of all-natural (ca. 96 wt% of biobased
components, excluding crosslinkers) and biocompatible semi-IPNs. Remarkably, the DESs entrapped in
the semi-IPNs served as a stable nonaqueous electrolyte in the range of 25–75 °C, thus exhibiting a
typical Arrhenius dependence of conductivity with temperature (an apparent activation energy of 18 kJ
mol−1
), irrespective of the type of crosslinker used. Following electrode polarization (EP) analysis based on
the Macdonald–Trukhan model, the free-ion diffusivity, the mobility, and the number of charge carrier
density of the polymeric networks were calculated. The results show that diffusivity and mobility increase
along with temperature in all semi-IPNs with a maximum conductivity of 3.2 mS cm−1 at 65 °C in the
semi-IPN crosslinked with a trifunctional acrylate. The higher conductivity and diffusivity observed in the
semi-IPN crosslinked with the trifunctional acrylate in comparison with the difunctional one are related to
the long-translational diffusion, because the diffusive dynamics are dominated by the localized motions
that are not strongly affected by the confinement of the DES electrolyte within the polymeric network. In
summary, this work furthers the applications of DES chemistry towards the fabrication of greener
materials, e.g. natural polymers and biobased feedstocks, with future applications in technologies seeking
biocompatible conductive gels. [-]
Publicado en
Green Chemistry, 2020, v. 22, p. 5785-5797Proyecto de investigación
1) National Council of Science and Technology (CONACYT) through grant no. 252774; 2) PAPIIT-UNAM project no. IA202018 and TA200220, Mexico; 3) The National Laboratory for Characterization of Physicochemical Properties and Molecular Structure, CONACYT (Grant No. 123732); 4)Derechos de acceso
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