Alternative block polyurethanes based on poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and poly(ethylene glycol)

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Polyurethanes are widely used in biomedical applications.
• Developing novel polyurethane structures with tailored properties is crucial for advanced biomaterials.
• Amphiphilic block copolymers offer unique characteristics for tissue engineering and drug delivery.

Purpose of the Study:

• To synthesize and characterize novel amphiphilic alternative block polyurethane copolymers.
• To investigate the hemocompatibility, cytotoxicity, and in-vitro degradation of these novel copolymers.
• To establish a synthetic methodology for creating structure-property relationships in biomaterials.

Main Methods:

• Synthesis of P3/4HB-PEG block copolymers via coupling reaction.
• Characterization using FTIR, (1)H NMR, GPC, and composition analysis.
• Evaluation of thermal properties (DSC, TGA), hemocompatibility (platelet adhesion), cytotoxicity (CCK-8 assay), and in-vitro degradation (PBS, lipase buffer).

Main Results:

• Successfully synthesized amphiphilic alternative block polyurethanes with controlled compositions and segment lengths.
• Demonstrated excellent hemocompatibility and good cell viability of rat aortic smooth muscle cells (RaSMCs).
• Observed varied degradation patterns (surface erosion to bulk collapsing) depending on the medium.

Conclusions:

• The synthesized P3/4HB-PEG block copolymers show promising hemocompatibility and biocompatibility for biomedical use.
• The developed synthetic approach allows precise control over copolymer structure and properties.
• These tailored biomaterials offer potential for diverse biomedical applications requiring specific degradation profiles.