Biodegradable photo-crosslinked poly(ether-ester) networks for lubricious coatings

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Surface Science

Background:

• Current medical devices often rely on non-degradable silicone coatings for lubrication.
• There is a need for biodegradable lubricant alternatives in medical applications.
• Poly(ether-ester)s offer tunable properties for material design.

Purpose of the Study:

• To synthesize biodegradable poly(ether-ester) networks via UV photopolymerization.
• To evaluate the lubrication performance of these novel networks.
• To assess their potential as replacements for non-degradable medical lubricants.

Main Methods:

• Synthesis of photopolymerizable macromers by copolymerizing polyethers (PEG, PPG, PTMG) with D,L-lactic acid oligomers.
• Characterization of chemical structures using 1H NMR and IR spectroscopy.
• Formation of crosslinked networks via UV-initiated free-radical polymerization and evaluation of properties like gel/water content and contact angle.
• Assessment of in vitro degradation and lubrication performance on stainless-steel needles.

Main Results:

• Successful synthesis and characterization of biodegradable poly(ether-ester) networks.
• Degradation times varied from 20 minutes to 7 days, influenced by crosslinking density and polyether type.
• PPG-based polymer networks demonstrated a significant 41% improvement in penetration force compared to uncoated needles.
• The developed materials exhibited promising lubrication properties.

Conclusions:

• Biodegradable poly(ether-ester) networks synthesized via UV photopolymerization show excellent lubrication potential.
• These materials offer a tunable degradation profile and effective friction reduction.
• They represent a viable, eco-friendly alternative to current non-degradable silicone lubricants for medical products.