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Film Extrusion of Crambe abyssinica/Wheat Gluten Blends
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Plasticized chitosan/polyolefin films produced by extrusion.

Marie Matet1, Marie-Claude Heuzey1, Abdellah Ajji1

  • 1Chemical Engineering, Research Center for High Performance Polymer and Composite Systems-CREPEC, Polytechnique Montréal, 2500 chemin de Polytechnique, Montreal, QC, Canada H3 T 1J4.

Carbohydrate Polymers
|December 16, 2014
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Summary

This study developed plasticized chitosan and polyethylene blends for films. The resulting materials showed altered mechanical properties and water vapor permeability, indicating potential for new packaging applications.

Keywords:
ExtrusionMelt processingPlasticized chitosanPolymer blend

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials

Background:

  • Chitosan, a biopolymer, offers potential for sustainable materials.
  • Polyethylene (PE) is a widely used commodity plastic.
  • Blending these materials can create novel composites with tailored properties.

Purpose of the Study:

  • To develop plasticized chitosan and metallocene polyethylene (mPE) blends.
  • To investigate the effect of plasticized chitosan on mPE film properties.
  • To assess the compatibility and performance of chitosan-PE blends.

Main Methods:

  • Single-pass extrusion for masterbatch production using twin-screw extrusion.
  • Plasticization of chitosan with acetic acid and glycerol.
  • Film extrusion of mPE/chitosan blends with ethylene vinyl acetate (EVA) as a compatibilizer.
  • Characterization of film morphology, color, haze, mechanical properties, and permeability.

Main Results:

  • Formation of small plasticized chitosan domains (<5 μm) within the mPE matrix.
  • Films exhibited a brown color and increased haze with higher chitosan content.
  • Mechanical properties were influenced by chitosan, with improvements noted due to EVA-induced compatibility.
  • Water vapor permeability of mPE films was altered, while oxygen permeability remained unchanged.

Conclusions:

  • Plasticized chitosan can be successfully incorporated into mPE films.
  • EVA enhances the compatibility between mPE and chitosan.
  • The blends show modified barrier properties, particularly for water vapor.
  • These findings suggest potential for chitosan-PE blends in specific film applications.