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Preparation and Performance of PBAT/PLA/CaCO3 Composites via Solid-State Shear Milling Technology
Xuehua Jia1, Qilin Wen1, Yanjun Sun1
1State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
Polymers
|October 26, 2024
Summary
Biodegradable PBAT/PLA composites with nano-CaCO3 offer a solution to plastic pollution. Solid-state shear milling improved filler dispersion and polymer compatibility, enhancing mechanical properties for green packaging applications.
Area of Science:
- Materials Science
- Polymer Science
- Sustainable Packaging
Background:
- Traditional plastics contribute to environmental
- white pollution
Purpose of the Study:
- To enhance the properties of biodegradable PBAT/PLA/nano-CaCO3 composites for packaging films.
- To address poor filler dispersion and inter-polymer compatibility issues.
Main Methods:
- Solid-state shear milling (S3M) technology was employed for mechanochemical modification and in situ compatibilization.
- PBAT/PLA/nano-CaCO3 composites were processed under varying milling conditions.
- Melt blending with a chain extender (ADR) was used to improve matrix compatibility.
Main Results:
- S3M improved nano-CaCO3 dispersion and PBAT/PLA compatibility.
- Partial molecular chain fragmentation and active functional group generation were observed.
- The composite film with milled PBAT and CaCO3 showed superior performance: 22 MPa tensile strength and 437% fracture elongation.
Conclusions:
- S3M is an effective strategy for enhancing biodegradable polymer composites.
- Improved compatibility and dispersion lead to superior mechanical properties.
- The developed composite film shows significant potential for green packaging solutions.
