Related Experiment Video
Updated: Jun 1, 2026
11:26
Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation
Published on: June 17, 2014
16.7K
High-Oxygen-Barrier Multilayer Films Based on Polyhydroxyalkanoates and Cellulose Nanocrystals
Beatriz Melendez-Rodriguez1, Sergio Torres-Giner1, Inmaculada Angulo2
1Novel Materials and Nanotechnology Group, Institute of Agrochemistry and Food Technology (IATA), Spanish Council for Scientific Research (CSIC), 46980 Valencia, Spain.
Nanomaterials (Basel, Switzerland)
|June 2, 2021
Summary
Researchers developed novel bio-based multilayer films using polyhydroxyalkanoates (PHA) and cellulose nanocrystals (CNCs). These compostable films significantly improved oxygen barrier properties while maintaining transparency and mechanical integrity.
Area of Science:
- Materials Science
- Polymer Science
- Sustainable Packaging
Background:
- Polyhydroxyalkanoates (PHA) are biodegradable polymers with potential for packaging applications.
- Current PHA materials often lack sufficient barrier properties for demanding applications.
- Development of multilayer structures can enhance material performance.
Purpose of the Study:
- To develop and characterize novel organic, recyclable, high-oxygen-barrier multilayer films.
- To utilize bio-based and compostable materials, including PHA, PBAT, PHBV from cheese whey, and cellulose nanocrystals (CNCs).
- To evaluate the impact of CNC interlayers on film properties.
Main Methods:
- Fabrication of multilayer films using commercial PHA, PHA/PBAT blends, PHBV adhesive layers, and CNC interlayers.
- Characterization of morphological, optical, mechanical, water vapor, limonene, and oxygen barrier properties.
- Assessment of interlayer adhesion and transparency.
Main Results:
- Multilayer films demonstrated good interlayer adhesion and contact transparency.
- Incorporation of a 1 µm CNC interlayer reduced oxygen permeance by 71–86%.
- Film stiffness was enhanced by CNCs, while elasticity remained high.
Conclusions:
- The developed multilayer films offer excellent oxygen barrier properties from bio-based and compostable sources.
- Cellulose nanocrystals are effective in enhancing barrier performance without compromising transparency.
- These materials represent a sustainable alternative for high-barrier packaging applications.
