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A Facile and Eco-friendly Route to Fabricate PolyLactic Acid Scaffolds with Graded Pore Size
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Ultralow loading mussel-inspired conductive hybrid as highly effective modifier for function-engineered poly(lactic
Leixin Deng1, Chenyang Cai1, Yangze Huang1
1Co-Innovation Center of Efficient Processing and Utilization of Forest Resource, School of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
International Journal of Biological Macromolecules
|July 2, 2021
Summary
This study developed advanced polylactic acid (PLA) composites with enhanced mechanical strength, antibacterial properties, and electromagnetic interference (EMI) shielding using minimal functional fillers like silver nanoparticles.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Preparing polylactic acid (PLA) composites with high mechanical properties, antibacterial capabilities, and effective electromagnetic interference (EMI) shielding at low filler concentrations is challenging.
- Developing multifunctional fillers and effective dispersion strategies is crucial for enhancing PLA composite performance.
Purpose of the Study:
- To create novel PLA composites with superior mechanical, antibacterial, and EMI shielding properties using ultralow filler loading.
- To engineer multifunctional nanoparticles and interfacial modifiers for improved filler-matrix interactions and network formation.
Main Methods:
- Utilized green mechanochemistry for nano-sizing lignin particles as reinforcement and carrier.
- Synthesized hybridized ZnO/Ag particles via a one-pot approach for multi-functionality.
- Introduced dopamine as a cross-linker to synthesize in-situ polypyrrole (PPy-PDa) nanofibrils for interfacial modification and particle dispersion.
Main Results:
- Constructed a 3D conductive network using PPy-PDa nanofibrils and hybridized particles, significantly improving EMI shielding and electrical conductivity.
- Achieved excellent EMI shielding effectiveness (48.6 dB at X-band) and electrical conductivity (104.2 S/cm) with only 0.29 vol% Ag.
- The resulting biobased composites exhibited outstanding anti-dripping, mechanical, antibacterial, joule heating, and photothermal conversion properties.
Conclusions:
- The developed PLA composites demonstrate superior performance compared to existing materials, attributed to the effective construction of conductive networks.
- The use of nano-sized lignin, hybridized ZnO/Ag, and PPy-PDa nanofibrils offers a promising strategy for creating high-performance, multifunctional biobased materials.
- These advanced PLA composites hold significant potential for applications in wearable electronics, food packaging, and medical devices.
