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Melt processing of paramylon using a water:ionic liquid mixture as plasticizer.

Frédérica Feuzing1, Jean Pierre Mbakidi2, Bruno Pontoire3

  • 1Université de Nantes, Oniris, CNRS, GEPEA, UMR 6144, F- 44470 Carquefou, France; Institut de Chimie Moléculaire de Reims, CNRS UMR 7312, Université de Reims Champagne-Ardenne, BP 1039, 51687 Reims Cedex, France.

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|February 6, 2023
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Summary
This summary is machine-generated.

Ionic liquid/water mixtures enable processing of paramylon, a β-1,3-glucan from Euglena Gracilis. This approach yields soluble paramylon solutions and thermoplastic films without chemical modification.

Keywords:
Ionic liquidMelt processingMicroalgaePlasticizerβ-1,3-Glucan

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Microalgal Biotechnology

Background:

  • Paramylon, a linear β-1,3-glucan from Euglena Gracilis, possesses a native crystalline structure hindering water solubility and thermoplasticity.
  • Conventional methods to alter paramylon's properties often involve chemical modifications.

Purpose of the Study:

  • To investigate ionic liquid/water mixtures as a solvent and plasticizer for paramylon.
  • To explore alternative, non-chemical methods for processing paramylon into functional materials.

Main Methods:

  • Utilizing a cholinium glycinate/water mixture (40:60) as a solvent and plasticizer for paramylon.
  • Processing paramylon solutions into reversible ionogels upon cooling.
  • Thermomechanical processing (extrusion, hot-pressing) of paramylon into transparent films below 100°C.

Main Results:

  • Paramylon solutions were obtained at 80°C, forming reversible ionogels upon cooling to 20°C.
  • Thermoplastic paramylon films were produced with an amorphous matrix reinforced by oriented triple helix nanofibers.
  • Processed films exhibited a storage modulus of 300-450 MPa and a tensile strain at break of 27%.

Conclusions:

  • Ionic liquid/water mixtures offer a viable alternative to chemical modification for processing paramylon.
  • This method enables the creation of novel paramylon-based materials with tunable properties.
  • Observed recrystallization into an unidentified structure suggests further research opportunities.