All-Biobased Seaweed-Derived Composite Films with Improved Mechanical Properties and Active Functionality Enabled by...

Area of Science:

• Materials Science
• Polymer Science
• Biotechnology

Background:

• The persistence of petroleum-based plastics poses a significant environmental crisis.
• Developing biodegradable materials with robust mechanical and functional properties is challenging.
• Polysaccharides offer potential but face synthesis difficulties.

Purpose of the Study:

• To create a high-strength, fully biobased composite film from seaweed.
• To enhance the film's properties with multifunctional components.
• To evaluate the film's mechanical, thermal, UV-shielding, antibacterial, and biodegradability characteristics.

Main Methods:

• Constructing a composite film by bridging sodium alginate with microcrystalline cellulose.
• Incorporating tannic acid (TA) to improve interactions and add functionality.
• Characterizing tensile strength, thermal stability, UV transmittance, antibacterial activity, and soil biodegradability.

Main Results:

• The composite film achieved a tensile strength of approximately 15 MPa and excellent thermal stability (>180 °C).
• The film demonstrated nearly complete UV protection (∼2% transmittance) and intrinsic antibacterial activity.
• Near-complete disintegration was observed within four weeks under soil conditions.

Conclusions:

• A facile strategy for producing sustainable, multifunctional films from seaweed-derived materials was developed.
• The developed film exhibits competitive performance compared to existing seaweed-based materials.
• This biobased film presents a promising alternative for applications requiring mechanical strength, UV protection, and biodegradability.