Dual-Crosslinked Degradable Elastomeric Networks With Self-Healing Properties: Bringing Multi(catechol) Star-Block...

Area of Science:

• Biomaterials science
• Polymer chemistry
• Tissue engineering

Background:

• Degradable chemically crosslinked elastomers offer rubber-like properties for tissue engineering but lack self-healing, limiting their use after damage.
• Surgical handling and implantation can cause damage, leading to property loss in current biomedical elastomers.
• The inability of existing materials to self-heal after damage presents a significant drawback for long-term biomedical applications.

Purpose of the Study:

• To design and synthesize biodegradable dual-crosslinked networks with rapid self-healing properties at 37 °C.
• To investigate two distinct synthetic approaches for creating self-healable elastomeric networks.
• To evaluate the mechanical properties, degradation behavior, and biocompatibility of the developed materials for potential use in temporary medical devices.

Main Methods:

• Preparation of dual-crosslinked elastomeric networks using hydrophobic poly(ethylene glycol)-poly(lactic acid) (PEG-PLA) star-shaped copolymers.
• Two methods were employed: mixing copolymers with either catechol or methacrylate moieties, and using bifunctional copolymers with both moieties.
• Characterization of self-healing efficiency, mechanical properties, degradation kinetics, and biocompatibility at 37 °C.

Main Results:

• Designed biodegradable dual-crosslinked networks exhibiting fast and efficient self-healing at 37 °C.
• Supramolecular networks based on hydrogen bonds between catechol groups facilitated self-healing, while covalent networks ensured mechanical integrity.
• Bifunctional PEG-PLA copolymers demonstrated superior performance compared to mixed copolymer systems.
• The materials exhibited soft-tissue-compatible mechanical properties, linear degradation, and proven biocompatibility.

Conclusions:

• Developed biodegradable and self-healable elastomeric networks possess properties suitable for temporary medical devices.
• The dual-crosslinking strategy effectively combines self-healing with robust mechanical characteristics and controlled degradation.
• The superior performance of bifunctional copolymers highlights their potential for advanced biomedical applications requiring self-healing capabilities.