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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
Published on: June 30, 2018
Constructing long-lasting antibacterial starch blown films via multi-functional epoxy micro-crosslinking effect
Wenying Liu1, Wenjin Liang1, Yayue He1
1Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan, 030008, China.
International Journal of Biological Macromolecules
|July 29, 2026
Summary
Researchers developed a micro-crosslinked pure starch film for sustainable packaging. This biodegradable material offers enhanced strength and long-lasting antibacterial properties, addressing limitations of traditional plastics.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biotechnology
Background:
- Petroleum-based plastics cause pollution, increasing demand for biodegradable alternatives.
- Starch is a renewable, biodegradable feedstock but suffers from poor mechanical properties and melt processability, limiting its use in applications like blow molding.
- Developing high-performance biodegradable materials is crucial for sustainable packaging solutions.
Purpose of the Study:
- To create a micro-crosslinked pure starch film suitable for blow molding.
- To enhance the mechanical strength and antibacterial properties of starch films.
- To promote the use of starch as a sustainable alternative in packaging.
Main Methods:
- Fabrication of micro-crosslinked pure starch films using reactive extrusion and blow molding.
- Incorporation of antibacterial hexamethylene guanidine hydrochloride and a multi-epoxy functional aromatic copolymer (AE) as a crosslinking agent.
- Characterization of the film's melt strength, mechanical properties, antibacterial efficacy, and degradation behavior.
Main Results:
- Micro-crosslinking improved melt strength, enabling stable blow molding of pure starch films.
- Optimal mechanical properties were achieved with 0.5 wt% AE content: 5.71 MPa tensile strength, 262% elongation at break, and a 583% increase in Young's modulus.
- The starch film demonstrated long-lasting bactericidal efficacy (>98.4% growth suppression after four weeks) and a decelerated degradation rate due to incorporated benzene ring segments.
Conclusions:
- Micro-crosslinking via reactive extrusion and blow molding is a feasible strategy for producing high-strength, antibacterial pure starch films.
- The developed starch films offer a promising sustainable alternative to petroleum-based plastics in packaging applications.
- The enhanced properties and biodegradability of these films contribute to reducing plastic pollution and promoting a circular economy.
