Environmentally Friendly Melt-Processed Chitosan/Starch Composites Modified with PVA and Lignin

Area of Science:

• Materials Science
• Polymer Science
• Biomaterials Engineering

Background:

• Traditional methods for chitosan/starch composites often involve solution processing, which can be less scalable and environmentally friendly.
• There is a need for sustainable and large-scale production of advanced composite materials with enhanced mechanical properties.

Purpose of the Study:

• To develop an alternative, environmentally friendly thermomechanical processing method for chitosan/starch composites.
• To investigate the effect of incorporating different types and contents of lignin and poly(vinyl alcohol) (PVA) on the mechanical properties and microstructure of these composites.

Main Methods:

• Chitosan/starch composites were fabricated using thermomechanical processing.
• Lignin and PVA were incorporated into the chitosan/starch matrix at varying compositions.
• Mechanical properties (tensile strength, elongation at break) were evaluated.
• Microstructure was analyzed using scanning electron microscopy (SEM).

Main Results:

• Thermomechanical processing offered a scalable alternative to traditional solution methods.
• The addition of both lignin and PVA significantly enhanced the tensile strength and elongation at break of the composites.
• The selection of specific lignin and PVA types allowed for tailored control over the composite's internal microstructure.
• SEM analysis confirmed that lignin and PVA incorporation led to smoother surfaces and more homogeneous composite structures.

Conclusions:

• Thermomechanical processing is a viable method for producing large-scale, environmentally friendly chitosan/starch composites.
• Lignin and PVA are effective additives for improving the mechanical performance and microstructural homogeneity of these composites.
• The study demonstrates the potential for designing customized biomaterials by controlling additive selection and processing parameters.