Stress transfer and matrix-cohesive fracture mechanism in microfibrillated cellulose-gelatin nanocomposite films

Franck Quero*, Cristina Padilla, Vanessa Campos, Jorge Luengo, Leonardo Caballero, Francisco Melo, Qiang Li, Stephen J. Eichhorn, Javier Enrione

*Autor correspondiente de este trabajo

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

18 Citas (Scopus)

Resumen

Microfibrillated cellulose (MFC) obtained from eucalyptus was embedded in gelatin from two sources; namely bovine and salmon gelatin. Raman spectroscopy revealed that stress is transferred more efficiently from bovine gelatin to the MFC when compared to salmon gelatin. Young's modulus, tensile strength, strain at failure and work of fracture of the nanocomposite films were improved by ∼67, 131, 43 y 243% respectively when using salmon gelatin as matrix material instead of bovine gelatin. Imaging of the tensile fracture surface of the MFC-gelatin nanocomposites revealed that crack formation occurs predominantly within bovine and salmon gelatin matrices rather than within the MFC or at the MFC/gelatin interface. This suggests that the mechanical failure mechanism in these nanocomposite materials is predominantly governed by a matrix-cohesive fracture mechanism. Both strength and flexibility are desirable properties for composite coatings made from gelatin-based materials, and so the findings of this study could assist in their utilization in the food and pharmaceutical industry.
Idioma originalInglés
Páginas (desde-hasta)89-98
Número de páginas10
PublicaciónCarbohydrate Polymers
Volumen195
DOI
EstadoPublicada - 1 sep 2018

Nota bibliográfica

Publisher Copyright:
© 2018 Elsevier Ltd

Palabras clave

  • Fracture mechanism
  • Gelatin
  • Interface
  • Microfibrillated cellulose
  • Nanocomposite
  • Stress transfer

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