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  4. Uniformly Dispersed Poly(lactic acid)-Grafted Lignin Nanoparticles Enhance Antioxidant Activity and UV-Barrier Properties of Poly(lactic acid) Packaging Films
 
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research article

Uniformly Dispersed Poly(lactic acid)-Grafted Lignin Nanoparticles Enhance Antioxidant Activity and UV-Barrier Properties of Poly(lactic acid) Packaging Films

Boarino, Alice  
•
Schreier, Aigoul  
•
Leterrier, Yves  
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May 24, 2022
Acs Applied Polymer Materials

Poly(lactic acid) (PLA) represents one of the most widely used biodegradable polymers for food packaging applications. While this material provides many advantages, it is characterized by limited antioxidant and UV-barrier properties. Blending PLA with lignin is an attractive strategy to address these limitations. Lignin possesses antioxidant properties and absorbs UV-light and is a widely available low value byproduct of the paper and pulp industry. This study has explored the use of lignin nanoparticles to augment the properties of PLA-based films. A central challenge in the preparation of PLA-lignin nanoparticle blend films is to avoid nanoparticle aggregation, which could compromise optical properties as well as antioxidant activity, among others. To avoid nanoparticle aggregation in the PLA matrix, PLA-grafted lignin nanoparticles were prepared via organocatalyzed lactide ring-opening polymerization. In contrast to lignin and unmodified lignin nanoparticles, these PLA-grafted lignin nanoparticles could be uniformly dispersed in PLA for lignin contents up to 10 wt %. The addition of as little as the equivalent of 1 wt % of lignin of these nanoparticles effectively blocked transmission of 280 nm UV-light. At the same time, these blend films retained reasonable visible light transmittance. The optical properties of the PLA lignin blend films also benefited from the well-dispersed nature of the PLA-grafted nanoparticles, as evidenced by significantly higher visible light transmittance of blends of PLA and PLA-grafted nanoparticles, as compared to blends prepared from PLA with lignin or unmodified lignin nanoparticles. Finally, blending PLA with PLA-grafted lignin nanoparticles greatly augments the antioxidant activity of these films.

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Type
research article
DOI
10.1021/acsapm.2c00420
Web of Science ID

WOS:000819519900001

Author(s)
Boarino, Alice  
•
Schreier, Aigoul  
•
Leterrier, Yves  
•
Klok, Harm-Anton  
Date Issued

2022-05-24

Publisher

AMER CHEMICAL SOC

Published in
Acs Applied Polymer Materials
Subjects

Materials Science, Multidisciplinary

•

Polymer Science

•

Materials Science

•

Polymer Science

•

poly(lactic acid)

•

lignin nanoparticles

•

food packaging

•

antioxidant

•

uv-barrier

•

food

•

pla

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LP  
LPAC  
Available on Infoscience
July 18, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/189236
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