Pickering-Stabilized Breath Figure Assembly of CNWs-TiO₂/PLA Porous Films: Synergistic Reinforcement and Functional...

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Sustainable packaging demands biodegradable polymers with improved functionality.
• Poly(lactic acid) (PLA) requires enhanced structural rigidity and performance.
• Addressing limitations in PLA for advanced applications is crucial.

Purpose of the Study:

• To develop functionalized PLA composite films with enhanced mechanical and protective properties.
• To investigate the synergistic effects of cellulose nanowhiskers (CNW) and TiO2 nanoparticles (Nano-TiO2) in PLA.
• To explore novel fabrication methods for advanced biodegradable materials.

Main Methods:

• Fabrication of PLA porous composite films using cellulose nanowhiskers (CNW) and TiO2 nanoparticles (Nano-TiO2) via a nanoparticle-assisted breath figure method.
• Systematic investigation of the effects of hybrid nanoparticles on composite morphology, thermal stability, and structure.
• Characterization of mechanical properties and UV-shielding performance.

Main Results:

• CNW and Nano-TiO2 acted as stabilizers, forming a honeycomb-like porous structure.
• Relative crystallinity of PLA increased from 20.26% to 36.31% due to heterogeneous nucleation.
• Tensile strength increased by 123.3%, Young's modulus by 21.9%, and UV-B shielding reached 97.6%.

Conclusions:

• Synergistic reinforcement of CNW and Nano-TiO2 significantly enhances PLA composite properties.
• The developed composite films exhibit superior mechanical strength and functional UV protection.
• CNW-Nano-TiO2/PLA composite films are promising for high-performance smart packaging applications.