Synthesis and characterization of conductive, biodegradable, elastomeric polyurethanes for biomedical applications

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Biodegradable conductive polymers are crucial for advanced biomedical applications.
• Developing materials with both conductivity and elasticity remains a challenge.
• Existing materials often lack the desired combination of properties for tissue regeneration and bioelectronics.

Purpose of the Study:

• To synthesize and characterize a novel biodegradable conductive polyurethane (CPU).
• To evaluate the electrical, mechanical, and degradation properties of the synthesized CPU.
• To assess the biocompatibility of the developed CPU for potential biomedical uses.

Main Methods:

• Synthesis of CPU using polycaprolactone diol, hexadiisocyanate, and aniline trimer.
• Doping the CPU with (1S)-(+)-10-camphorsulfonic acid (CSA) to enhance conductivity.
• Characterization of electrical conductivity, elasticity, electroactivity, electrical stability, and degradation rates.
• Assessment of cell proliferation and spreading using mouse 3T3 fibroblasts.

Main Results:

• Synthesized CPU films demonstrated good elasticity up to 30% strain.
• Electrical conductivity increased with CSA doping, reaching up to 7.3 × 10⁻⁵ S/cm in a wet state.
• The doped CPU exhibited good electrical stability in cell culture medium.
• Degradation rates increased with CSA content, and conductivity decreased after enzymatic degradation.
• Mouse 3T3 fibroblasts showed good proliferation and spreading on the CPU films.

Conclusions:

• The developed biodegradable CPU possesses a unique combination of elasticity, electrical conductivity, and stability.
• The material's properties can be tuned by adjusting CSA doping levels.
• The demonstrated biocompatibility and tunable degradation suggest significant potential for tissue engineering and smart drug delivery systems.