A common strategy to endow carboxyl group containing WPU with antibacterial, self-healing and recyclable functions

Waterborne polyurethanes (WPUs) are known for their eco-friendliness and adaptability in various industries. However, the quest for multifunctional materials has created a demand for WPUs with self-healing, recyclable, and antimicrobial properties. In this study, we introduce a universal approach to doping FeCl3 and poly(acrylic acid) (PAA) into carboxyl group containing WPUs that promotes dynamic coordination bonding between Fe3+ and -COO- groups of PAA and WPUs. WPU/Fe/PAA-5.5 with 5.5 wt % PAA stands out with excellent mechanical properties, strong self-healing capabilities and an impressive >90% antimicrobial rate. Importantly, these supramolecular films proved to be highly recyclable by facile hot-pressing, which can maintain good antimicrobial properties after multiple cycles. This research will shed light on the multifunctionalization of WPU.

Automated summary

In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.