Biodegradable polymer blends based on corn starch and thermoplastic chitosan processed by extrusion

Area of Science:

• Polymer Science
• Materials Science
• Biomaterials

Background:

• Thermoplastic cornstarch (TPS) is a biodegradable polymer with potential applications.
• Chitosan (TPC) is another biopolymer known for its film-forming properties.
• Combining TPS and TPC could lead to novel biomaterials with tailored properties.

Purpose of the Study:

• To investigate the effects of incorporating thermoplastic chitosan (TPC) into a thermoplastic cornstarch (TPS) matrix.
• To analyze the impact of polymer interactions on the morphology, thermal, and mechanical properties of TPS/TPC blends.
• To assess the potential for creating enhanced biomaterials through TPS and TPC blending.

Main Methods:

• Melt extrusion was used to prepare blends of thermoplastic cornstarch (TPS) and thermoplastic chitosan (TPC).
• X-ray Diffraction (XRD) and Fourier-Transform Infrared Spectroscopy (FTIR) were employed to study polymer interactions.
• Scanning Electron Microscopy (SEM) was utilized to examine the blend morphology.

Main Results:

• SEM analysis revealed a homogeneous fracture surface, indicating good miscibility without starch granules or chitosan aggregates.
• The incorporation of TPC into the TPS matrix resulted in decreased tensile strength and stiffness.
• The TPS/TPC blends exhibited enhanced extensibility and improved thermal stability compared to pure TPS.

Conclusions:

• Thermoplastic cornstarch and thermoplastic chitosan blends can be successfully prepared via melt extrusion.
• While mechanical strength decreased, the blends offer improved flexibility and thermal resistance.
• These findings suggest potential for TPS/TPC blends in applications requiring enhanced film extensibility and stability.