Hydrolytically degradable hyperbranched PEG-polyester adhesive with low swelling and robust mechanical properties

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Tissue Engineering

Background:

• Development of effective and biocompatible tissue adhesives is crucial for various medical applications.
• Existing adhesives may face limitations in terms of mechanical strength, degradation, or biocompatibility.
• Hyperbranched polymers offer unique structural advantages for material design.

Purpose of the Study:

• To synthesize and characterize novel photocrosslinkable and water-soluble hyperbranched PEG-polyester (HPEGDA) polymers.
• To evaluate the potential of these HPEGDA polymers as robust, degradable adhesives for internal tissue repair.
• To assess the mechanical properties, degradation profile, swelling behavior, and cytotoxicity of the developed polymers.

Main Methods:

• Synthesis of HPEGDA polymers via controlled homopolymerization of poly(ethylene glycol) diacrylate (PEGDA700) using deactivation-enhanced atom transfer radical polymerization (DE-ATRP).
• Characterization of polymer structure, including short carbon-carbon backbones and pendant photocrosslinkable acrylate moieties.
• Evaluation of photo-cured HPEGDA for tissue adhesion, mechanical strength, degradation by hydrolysis, swelling ratio, and in vitro cytotoxicity.

Main Results:

• Successfully synthesized HPEGDA polymers with a hyperbranched architecture, featuring short C-C backbones and long PEG chains.
• Photo-cured HPEGDA demonstrated robust mechanical and adhesive strengths suitable for tissue patching.
• HPEGDA gels exhibited controlled degradation via polyester hydrolysis, low swelling ratios, and minor cytotoxicity in vitro.

Conclusions:

• HPEGDA polymers possess unique properties making them highly suitable for applications requiring degradable and adhesive biomaterials.
• The developed HPEGDA polymers show significant potential for use in tissue engineering matrixes, advanced wound dressings, and internal sealants.
• The combination of photocrosslinkability, water solubility, degradability, and biocompatibility positions HPEGDA as a promising material for biomedical applications.