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Performance and Durability of Biopolymer Blends Containing Modified Metal Oxide Particles.
Giulia Infurna1, Andrea Antonino Scamporrino2, Elisabetta Morici1,3
1Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze, Ed. 6, 90128 Palermo, Italy.
Polymers
|November 27, 2025
Summary
This study explored sustainable biopolymer composites using modified metal oxides. While enhancing mechanical properties and water resistance, these additives surprisingly accelerated photodegradation, indicating potential as photo-sensitive agents.
Area of Science:
- Materials Science
- Polymer Science
- Sustainable Materials
Background:
- Biopolymer blends like polylactic acid and polyamide 11 (PLA/PA11) are sustainable alternatives to conventional plastics.
- Improving the compatibility and performance of biopolymers with additives is crucial for their wider application.
- Metal oxides are common additives, but their interaction with biopolymer matrices needs further investigation.
Purpose of the Study:
- To investigate the effects of stearic acid-modified zinc oxide (f-ZnO) and sonicated titanium dioxide (s-TiO2) on PLA/PA11 biopolymer blends.
- To evaluate the influence of these modified metal oxides on the solid-state properties, morphology, melt behavior, and photo-oxidation resistance of the biopolymer blend.
- To compare the performance of modified metal oxides against their unmodified counterparts (ZnO and TiO2).
Main Methods:
- Melt mixing of PLA/PA11 blend with unmodified and modified metal oxides (f-ZnO, s-TiO2).
- Characterization using solid-state property analysis, rheological measurements, differential scanning calorimetry (DSC), and morphology studies.
- Assessment of photo-oxidation resistance under UV exposure.
Main Results:
- Modified f-ZnO and s-TiO2 exhibited a plasticizing effect on rheology, unlike unmodified oxides.
- Both modified and unmodified particles reinforced the biopolymer matrix, increasing Young's modulus.
- Metal oxides reduced macromolecular mobility, affecting melt temperatures but not the glass transition of the PLA phase.
- Increased hydrophobicity and enhanced water resistance were observed with f-ZnO and s-TiO2.
- Significantly reduced photo-oxidation resistance was noted, especially with modified metal oxides, suggesting they act as photodegradant agents.
Conclusions:
- Functionalized f-ZnO and s-TiO2 can improve mechanical properties and hydrophobicity of PLA/PA11 blends.
- The presence of metal oxides, particularly modified ones, accelerates the photodegradation of the biopolymer blend.
- Metal oxides may function as photo-sensitive degradants, a critical consideration for outdoor applications of these biopolymers.
