Melt electrospinning of biodegradable polyurethane scaffolds

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• Melt electrospinning offers an attractive, solvent-free method for creating tissue engineering scaffolds.
• Limited research exists on melt electrospinning due to technical challenges and polymer development difficulties.
• Developing suitable biodegradable and thermally stable polymers is crucial for successful melt electrospinning.

Purpose of the Study:

• To develop and characterize a novel biodegradable polyurethane (PU) suitable for melt electrospinning.
• To evaluate polymer formulations for their utility in the melt electrospinning process.
• To assess the properties of scaffolds produced via melt electrospinning.

Main Methods:

• Synthesized aliphatic polyurethanes using diisocyanates, polycaprolactone (PCL), 1,4-butanediamine, and 1,4-butanediol (BD).
• Optimized polymer formulation (4/1/3M ratio of PU/PCL/BD) with a weight-average molecular weight of approximately 40kDa.
• Evaluated the melt electrospinning process and characterized the resulting scaffolds' structure and mechanical properties.

Main Results:

• A non-toxic, biodegradable polyurethane was successfully developed for melt electrospinning.
• The optimized polymer formulation yielded scaffolds with point bonds between fibers.
• The electrospun scaffolds exhibited mechanical properties comparable to in vivo soft tissues.

Conclusions:

• A novel polyurethane is suitable for melt electrospinning, enabling the production of tissue engineering scaffolds.
• This solvent-free approach eliminates cytotoxic solvent concerns in scaffold fabrication.
• The developed scaffolds possess desirable mechanical characteristics for soft tissue applications.