The Influence of Various Chemical Modifications of Sheep Wool Fibers on the Long-Term Mechanical Properties of Sheep Wool/PLA Biocomposites

Piotr Szatkowski ¹

⁰Department of Glass Technology and Amorphous Coatings, Faculty of Materials Science and Ceramics, AGH University of Krakow, Al. Mickiewicza 30, 30-059 Krakow, Poland.

Materials (basel, Switzerland) +

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July 12, 2025

View abstract on PubMed

Summary

This study developed biodegradable composites using sheep wool and polylactide (PLA). Wool-reinforced PLA showed improved UV resistance and accelerated degradation, offering a sustainable packaging solution from agricultural waste.

Area Of Science

Materials Science
Polymer Science
Sustainable Materials

Background

Sheep wool, a natural fiber, faces declining use in textiles due to synthetic alternatives and shifts in agriculture.
Wool from slaughter sheep is often considered biodegradable waste, presenting an opportunity for valorization.
Polylactide (PLA) is a biodegradable polymer with potential for composite development.

Purpose Of The Study

To create a fully biodegradable composite using a polylactide (PLA) matrix reinforced with sheep wool.
To optimize chemical modifications of sheep wool fibers to enhance composite properties, particularly mechanical performance.
To evaluate the biodegradation behavior and environmental resistance of the developed biocomposites.

Main Methods

Development of PLA/sheep wool biocomposites with varying wool content and chemical modifications.
Exposure of composites to aging conditions simulating biodegradation stimuli.
Analysis of mechanical properties, dynamic thermal analysis, and microscopic examination of material changes.

Main Results

Wool-reinforced PLA composites demonstrated significantly enhanced UV degradation resistance compared to pure PLA.
Chemical modifications improved fiber-matrix compatibility, increasing glass transition temperatures and altering mechanical properties.
While not enhancing mechanical strength, wool acted as a beneficial filler, accelerating degradation and utilizing waste material.

Conclusions

Biodegradable composites of PLA and sheep wool offer sufficient mechanical properties for packaging applications.
These biocomposites exhibit superior environmental resistance compared to pure PLA, promoting circular economy principles.
This research pioneers the investigation into modified sheep wool's impact on PLA biocomposite properties and degradation rates.

Keywords:

biocomposites natural sheep wool fibers