Near-Infrared-Triggered Self-Healing and Antibacterial Biobased Waterborne Polyurethane Enabled by Porphyrin Covalent Organic Frameworks

Biobased waterborne polyurethane (WPU) integrating dual functionalities of antimicrobial and self-healing capabilities has emerged as a burgeoning research frontier. In this study, a porphyrin-based biomass covalent organic framework (Por-COF) with exceptional photothermal conversion efficiency and photodynamic activity was synthesized to improve the comprehensive properties of WPUS that possessed self-healing ability induced by disulfide. The prepared WPUS/Por-COF composites demonstrated excellent photothermal performance, achieving a temperature of 79.3 °C after 10 min of irradiation with a 730 nm laser (2 W/cm2), coupled with inhibition rates approaching 100% against both Staphylococcus aureus and Escherichia coli. Besides, WPUS/Por-COF showed significant improvement in tensile strength, which increased from 3.1 to 12.0 MPa with the incorporation of Por-COF. Additionally, disulfide bonds were introduced into the biobased WPU system, endowing the WPUS/Por-COF with a near-infrared-triggered self-healing property (>68%). The composite films highlight their potential for self-healing and antibacterial coatings in biomedical fields.