Degradable photo-crosslinked starch-based films with excellent shape memory property

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Growing plastic pollution necessitates advanced biodegradable materials.
• Shape memory polymers inspire novel functional biodegradable plastics.
• Starch-based materials offer a sustainable alternative to conventional plastics.

Purpose of the Study:

• To synthesize photo-crosslinked starch films with enhanced shape memory performance.
• To investigate the impact of UV-induced crosslinking on starch film properties.
• To evaluate the potential of these films for biodegradable packaging applications.

Main Methods:

• Starch films were crosslinked using UV irradiation and benzophenone initiation.
• Free radicals were generated to form a 3D crosslinking network in starch macromolecules.
• Mechanical properties, water resistance, and shape memory recovery were characterized.

Main Results:

• A 3D crosslinking network was successfully formed in the starch films.
• Photo-crosslinked films showed a 154% increase in tensile strength and improved water resistance (contact angle increased from 60° to 87°).
• Shape memory recovery reached nearly 180° bending, with shape fixity and recovery ratios exceeding 96.5% and 99.8% under stretch deformation.

Conclusions:

• Photo-crosslinked starch films exhibit excellent shape memory properties and enhanced mechanical and water resistance.
• The developed films demonstrate significant potential for applications in disposable, heat-shrinkable biodegradable packaging.
• This research contributes to the development of sustainable materials addressing plastic pollution concerns.