Dynamic Surfaces-Degradable Polyester Networks that Resist Protein Adsorption

Area of Science:

• Polymer Chemistry
• Materials Science
• Biomaterials

Background:

• Development of degradable polymers is crucial for biomedical applications.
• Controlling polymer network structure influences degradation and surface properties.
• Photoactive crosslinking offers precise network formation.

Purpose of the Study:

• To synthesize novel degradable alternating copolyesters.
• To investigate the effect of crosslinking density on network properties.
• To evaluate degradation kinetics and protein adsorption behavior.

Main Methods:

• Synthesis of alternating copolyesters from diglycolic anhydride (DGA) and epoxides (epoxymethoxytriethylene glycol and epoxy benzophenone).
• UV-initiated photoactive crosslinking to form polymer networks.
• Solvent extraction to determine gel fraction (crosslinking density).
• Degradation studies in buffer solutions at varying pH.
• Bovine serum albumin (BSA) adsorption measurements.

Main Results:

• Degradation kinetics varied with gel fraction: lower gel fractions showed faster, first-order degradation; higher gel fractions exhibited slower, zeroth-order degradation.
• Lower gel fraction networks had higher swelling ratios and better resistance to BSA adsorption via entropic shielding and rapid degradation.
• Higher gel fraction networks, with increased epoxy benzophenone content, adsorbed more BSA due to hydrophobic interactions and slower degradation.

Conclusions:

• Crosslinking density significantly impacts the degradation rate and protein adsorption of these novel copolyester networks.
• Tunable network structures allow for control over material performance, balancing degradation and surface interactions.
• These findings provide insights for designing degradable materials with tailored properties for specific applications.