Tough, transparent and antibacterial WPU

Researchers have presented a high strength, tough and transparent waterborne polyurethane with good antibacterial performance.

Petri dishes with bacterial cultures.
The ZnO–rGO coatings exhibited high activity against the Gram-positive bacterium Staphylococcus aureus. Image source: branislavp (symbol image).

To reach a more sustainable society, it is an irresistible trend to replace the solvent-based polyurethane with waterborne polyurethane (WPU). However, it remains a challenge to fabricate WPU materials with excellent mechanical properties. Now, a transparent WPU with strength of 30.1 MPa and toughness of 195.7 MJ/m3 is developed by incorporating hydantoin diol (HD) into WPU macromolecule. The polar segments of WPU interact with each other by H-bonds and agglomerate together to form hard phase, which disperse in soft polycaprolactone diol (PCL) phase, forming micro-phase separated domains. It significantly enhances the tensile strength and toughness of the WPU.

Outstanding antibacterial properties

In comparison with covalent bonds, the reversibility of dynamic physical interactions of H-bonds enables the materials to be healed by heating. In addition, the 3 h-healed HDPU2 film exhibits high toughness (166.9 MJ/m3), tensile strength (20.6 MPa) and strain (2195 %). Furthermore, the HDPU2 film presents outstanding antibacterial properties after chlorination, inactivating 100 % of S. aureus and 96.2 % of E. coli within 60 min.

The study has been published in Progress in Organic Coatings,Volume 172, November 2022.

Hersteller zu diesem Thema

This could also be interesting for you!