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Upcycling End-of-life Polyamide 66 Into Antibacterial Materials
Hongjie Zhang1, Mingyu Gao1, Shihao Niu1
1State Key Laboratory of Bio-based Fiber Materials, Zhejiang Sci-Tech University, Hangzhou, China.
Macromolecular Rapid Communications
|November 18, 2025
Summary
This study upcycles waste Polyamide 66 (PA66) into a high-toughness, antibacterial material using a one-pot method. This sustainable approach offers a practical solution for plastic pollution and creates valuable materials for industrial applications.
Area of Science:
- Polymer Chemistry
- Materials Science
- Sustainable Plastics
Background:
- Polyamide 66 (PA66) is a common non-biodegradable plastic contributing to marine pollution.
- Existing chemical recycling methods for PA66 are complex, costly, and require monomer purification and metal catalysts.
Purpose of the Study:
- To develop a direct, one-pot method for upcycling end-of-life PA66 into high-value materials.
- To create a high-toughness, antibacterial material from waste PA66.
Main Methods:
- Utilized end-of-life PA66 as feedstock for melt polycondensation.
- Incorporated antibacterial monomers and bio-based long-chain dicarboxylic acids in a one-pot process.
- Synthesized a series of novel polyamide-based copolymers.
Main Results:
- Achieved a maximum tensile strength of 34.3 MPa and elongation at break up to 457.3% for a 0.5 mm thick film.
- Demonstrated nearly 100% antibacterial activity.
- Confirmed excellent spinnability and processability for fabric and film applications.
Conclusions:
- Successfully transformed waste PA66 into a high-performance antibacterial material.
- The one-pot method offers a practical and scalable strategy for PA66 upcycling.
- The developed material shows significant potential for the polymer industry, addressing plastic waste challenges.
