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Bio-based composite film from konjac flour and dialdehyde starch: Development, properties and structural features
Xin Zhang1, Hongyan Wang2, Xiaojian Zhou1
1Southwest Forestry University, Yunnan Key Laboratory of Wood Adhesives and Glued Products, Kunming, Yunnan, China.
International Journal of Biological Macromolecules
|September 21, 2024
Summary
This study developed eco-friendly konjac flour (KF) and dialdehyde starch (DAS) composite films. The optimal 25% DAS composite film demonstrated superior mechanical properties and thermal stability, offering a sustainable alternative to plastics.
Area of Science:
- Materials Science
- Polymer Science
- Biomaterials
Background:
- Petroleum-based plastics pose environmental risks.
- Renewable resources offer sustainable alternatives.
- Konjac flour (KF) exhibits excellent film-forming properties.
Purpose of the Study:
- To develop eco-friendly composite films using konjac flour (KF) and dialdehyde starch (DAS).
- To investigate the effect of DAS content on KF film properties.
- To characterize the physical, mechanical, and thermal properties of KF/DAS composite films.
Main Methods:
- Preparation of KF/DAS composite films with varying DAS ratios.
- Characterization of physical and mechanical properties (tensile strength, elongation at break).
- Analysis using Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction (XRD), Thermogravimetry (TG), and Scanning Electron Microscopy (SEM).
Main Results:
- The KF/DAS composite film with 25% DAS showed optimal mechanical properties (13.1 MPa tensile strength, 93.7% elongation at break).
- FT-IR and XRD confirmed strong chemical cross-linkages (Schiff base, esterification) between KF and DAS.
- TG and SEM revealed excellent thermal stability and a dense microstructure in the composite films.
Conclusions:
- KF/DAS composite films offer a promising sustainable material.
- The developed method effectively creates strong chemical cross-linkages.
- These films exhibit desirable mechanical and thermal properties for potential applications.
