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Anti-Swelling and Durable Adhesion Biodegradable Hydrogels to Tissue Repairs and Strain Sensors.

Adhesive hydrogels have gained great interest for biomedical applications, because of their great adhesion, tunable structure, high water content and biocompatibility. However, it is still challenging to engineer hydrogel materials combining tissue repairs and strain sensors. In this work, poly(thioctic acid) (PTA) is used as a skeleton structure and mixed with polydopamine (PDA), resulting in hydrogels with excellent stretchability, resilience and adhesion, which can adhere to various organic (porcine skin) and inorganic materials (ceramic, wood, and glass etc.) in both dry and wet environments. The hydrogels also exhibit anti-swelling behavior, self-healing and repeatable adhesion capacity (7 times), which are meaningful for bio-applications and show satisfactory biocompatibility, biodegradation, cell affinity and ability to limit apoptosis both in vitro and vivo experiments. In the full-thickness skin defect model, the hydrogels can accelerate the wound healing process. The introduction of Fe3+ can significantly enhance the conductivity of the hydrogels, making it possible for the hydrogels to be used as strain sensors. This functional hydrogel may find an appealing application as an anti-swelling and durability adhesive for strain sensors.