High-strength self-healing hydrogels based on boronate-diol complexation cross-linking with good bioavailability

Abstract

In this report, new self-healing hydrogels were obtained through simple one-pot free radical polymerization of acrylamide, phenylboronic acid, and 2-hydroxyethyl acrylate as copolymer monomers, potassium persulfate (KPS) as initiator, and tetramethylethylenediamine (TEMED) as promoter under low-temperature alkaline (pH = 9) conditions. The boronic acid group of phenylboronic acid (PBA) can interact with the hydroxyl group of hydroxyethyl acrylate (HEA) to form dynamic boronic ester bonds instead of the conventional bis acrylate crosslinkers. The effect of PBA content on the mechanical strength of the hydrogels was systematically investigated. The hydrogels exhibited higher stress, elongation, and self-healing properties due to the synergistic effect of H-bonds and boronate-diol complexation. Further studies revealed that the A–H–0.2–P–0.08 hydrogels exhibited excellent resistance to compression fatigue and also showed good biocompatibility through in vitro cytotoxicity tests.