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Strong Interface via Weak Interactions: Ultratough and Malleable Polylactic acid/Polyhydroxybutyrate Biocomposites
Xunan Hou1, Xuehong Lu2, Chaobin He1,3
1Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575, Singapore.
Macromolecular Rapid Communications
|October 18, 2021
Summary
This study enhances bio-based polymer composites, poly(l-lactic acid) (PLLA) and poly(3-hydroxybutyrate) (PHB), by adding poly(methyl methacrylate) (PMMA). The resulting blends exhibit significantly improved mechanical properties, offering a sustainable alternative to petroleum plastics.
Area of Science:
- Materials Science
- Polymer Chemistry
- Sustainable Materials
Background:
- Conventional plastics pose environmental challenges.
- Bio-based polymers like PLLA and PHB offer sustainable alternatives.
- PLLA and PHB suffer from brittleness and poor miscibility, limiting their applications.
Purpose of the Study:
- To improve the mechanical properties of PLLA/PHB blends.
- To develop robust biocomposites for practical applications.
- To explore the use of poly(methyl methacrylate) (PMMA) as a compatibilizer.
Main Methods:
- Melt mixing of PLLA, PHB, and PMMA.
- Characterization of blend morphology and mechanical properties.
- Analysis of interfacial nanolayer formation driven by entropy.
Main Results:
- PMMA addition created an interfacial nanolayer, altering blend morphology.
- Ternary blends showed a 55-fold increase in elongation and 50-fold increase in toughness.
- The enhanced biocomposites demonstrated metal-like malleability while retaining high stiffness and strength.
Conclusions:
- PMMA effectively enhances the mechanical performance of PLLA/PHB blends.
- The strategy provides a pathway for creating mechanically robust biocomposites.
- This approach supports the development of advanced green devices using sustainable materials.
