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

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−...

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Bibliographic Details
Published in:International journal of biological macromolecules 2018-10, Vol.118 (Pt B), p.1817-1823
Main Authors: Norcino, Laís B., de Oliveira, Juliano E., Moreira, Francys K.V., Marconcini, José M., Mattoso, Luiz H.C.
Format: Article
Language:English
Subjects:
Chitosan - chemistry
Cross-linking
Dynamic Light Scattering
Elasticity
Ions - chemistry
Mechanical Phenomena
Natural polymers
Pectins - chemistry
Polymers - chemistry
Rheology
Spectroscopy, Fourier Transform Infrared
Synergism
Thermodynamics
Viscoelastic properties
Viscosity
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Summary: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. [Display omitted] •Chitosan and pectin form cross-linked gels with dense network at 25/75 mass ratio.•COO−/NH3+ interactions stiffen chitosan/pectin films over a wide temperature range.•Physical properties of blend films are finely modulated by ionic cross-linking.•Rheological and thermomechanical correlations in chitosan/pectin blends are stated.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2018.07.027