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    Rheological and thermo-mechanical evaluation of bio-based chitosan/pectin blends with tunable ionic cross-linking

    Year: 2018

    Journal: Int. J. Biol. Macromol., Volume 118, OCT 15, page 1817–1823

    Authors: Norcino, Lais B.; de Oliveira, Juliano E.; Moreira, Francys K. V.; Marconcini, Jose M.; Mattoso, Luiz H. C.

    Organizations: Universal Project CNPq [477489/2008-7]; FAPEMIG [APQ-01505-15]; CNPq [403357/2016-0, 302044/2015-9]

    Keywords: Cross-linking; Natural polymers; Viscoelastic properties; Synergism

    Bio-based chitosan/pectin blend films were prepared by solution casting and fully characterized in terms of their viscoelastic, thermo-mechanical and water affinity properties. Dynamic light scattering and rheological analyses served as a probe that polyelectrolyte complexes were formed through COO-/NH3+ ionic cross-linking, changing the chitosan/pectin solutions from Newtonian to pseudoplastic gel-like systems. The highest degree of ionic cross-linking has been found at a specific mass ratio (chitosan/pectin 25/75) and solid-state data were obtained in detail using dynamic mechanical thermal analysis. Ionic cross-linking was determining on the physical properties of chitosan/pectin blends, which was demonstrated by the thermo-mechanical spectra, high water contact angle and tensile strength of films. The specific thermo-mechanical properties of the chitosan/pectin films can be specifically modulated according to the chitosan/pectin mass ratio to ensure successfully applications in medicine, drug delivery, agricultural and food coatings. (C) 2018 Elsevier B.V. All tights reserved.
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