Covalent Topological Adhesion.

Area of Science:

• Materials Science
• Biomaterials Engineering
• Polymer Chemistry

Background:

• Achieving robust adhesion between wet materials, such as synthetic hydrogels and biological tissues, is challenging.
• Existing methods often require specific functional groups on the materials, employ toxic chemicals, or yield unstable bonds.
• There is a need for biocompatible, versatile adhesion strategies for diverse applications.

Purpose of the Study:

• To develop a novel method for achieving biocompatible, covalent adhesion between wet materials.
• To demonstrate this adhesion method without requiring pre-functionalized materials.
• To characterize the chemical and mechanical properties of the resulting adhesion.

Main Methods:

• Utilized two hydrogels with pre-existing covalent polymer networks as model adherends.
• Employed an aqueous solution of biopolymers and bioconjugate agents as the adhesive.
• Investigated the in situ cross-linking and topological entanglement of biopolymers within the hydrogel networks.

Main Results:

• Successfully achieved covalent topological adhesion between hydrogels using a biopolymer-based adhesive.
• Demonstrated that the covalent topological adhesion is stable in physiological fluid.
• Observed that noncovalent topological adhesion dissociates in physiological fluid, highlighting the stability of the covalent bond.

Conclusions:

• Developed a new, functional adhesion strategy for wet materials, applicable to hydrogels and biological tissues.
• The covalent topological adhesion method is biocompatible and does not require material-specific functional groups.
• This approach offers significant potential for advancing adhesion technologies in complex biological and synthetic environments.