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Choline Chloride Versus Choline Acetate: Anion Influence on Plasticizing Action in Starch/Chitosan Blends
Susanna Romano1, Serena De Santis1, Chiara Frezza1
1Department of Industrial, Electronic and Mechanical Engineering, Roma Tre University, Via Vito Volterra 62, Rome, 00146, Italy.
Chempluschem
|April 29, 2025
Summary
Biodegradable films from starch and chitosan were developed using choline-based ionic liquids as plasticizers. The acetate anion demonstrated superior plasticizing effects, enhancing film properties for various applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biotechnology
Background:
- Biopolymers are increasingly important but require modification for competitiveness with traditional plastics.
- Plasticizers and blending are key modification strategies for biopolymers like starch and chitosan.
- Bio-based ionic compounds offer non-volatile, biodegradable, and low-toxicity plasticizer alternatives.
Purpose of the Study:
- To develop biodegradable films using starch and chitosan blends.
- To investigate the plasticizing effects of choline chloride [Ch][Cl] and choline acetate [Ch][OAc].
- To evaluate the influence of plasticizer type and component fractions on film properties.
Main Methods:
- Film preparation via blending starch and chitosan with ionic liquid plasticizers.
- Characterization using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA).
- Evaluation of mechanical properties and wettability.
Main Results:
- The anion of the ionic liquid significantly influenced the properties of the starch-chitosan films.
- Choline acetate [Ch][OAc] exhibited a greater plasticizing capacity compared to choline chloride [Ch][Cl].
- Variations in starch and chitosan fractions also affected film characteristics.
Conclusions:
- Biodegradable starch-chitosan films can be effectively plasticized using bio-based ionic liquids.
- The acetate anion is a promising component for enhancing biopolymer film properties.
- This research contributes to developing sustainable materials for packaging and other industries.
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