Electro-Actuation of a Smart Hydrogel Compatible With 3D Printing

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Electroactive hydrogels are crucial for applications like drug delivery and tissue engineering.
• Developing novel polymers with controlled actuation and biocompatibility is essential.

Purpose of the Study:

• To synthesize and characterize a novel electroactive polymer, AMPS-co-PEGDA.
• To determine optimal UV curing conditions for repeatable actuation without material failure.
• To evaluate the biocompatibility and 3D printability of the optimized polymer.

Main Methods:

• Free radical polymerization of 2-acrylamido-2-methylpropane sulfonic acid and poly(ethylene glycol) diacrylate (AMPS-co-PEGDA) using UV light.
• Systematic variation of UV exposure (900 mJ/cm² at 365 nm⁻¹) to determine optimal curing parameters.
• Non-cytotoxicity testing using dermal fibroblast cells.
• Suspended 3D printing within an agarose supporting bed to create complex geometries.

Main Results:

• Optimal UV curing at 900 mJ/cm² enabled repeatable actuation without cracking.
• Increased curing time led to brittle materials prone to cracking.
• The optimized AMPS-co-PEGDA hydrogel demonstrated non-cytotoxicity to dermal fibroblasts.
• Suspended 3D printing allowed for the fabrication of complex, electro-actuatable structures.
• Processing in agarose reduced Young's modulus, enhancing bending capabilities.

Conclusions:

• The optimized AMPS-co-PEGDA hydrogel is a promising electroactive material for biomedical applications.
• Tuneable properties and complex geometries achievable through 3D printing expand its functional potential.
• The material's non-cytotoxicity and repeatable actuation make it suitable for advanced biomedical devices.