Synthesis of Carboxyl Cellulose Nanocrystals/Copper Nanohybrids to Endow Waterborne Polyurethane Film with Improved Mechanical and Antibacterial Properties

The multifunctional nanohybrid fillers have attracted widespread attention in the field of polymer nanocomposites. In this study, carboxyl cellulose nanocrystals/copper nanoparticles (TCNC/Cu NP) nanohybrids were prepared by situ growth copper ions on modified CNC, and further doped into waterborne polyurethane (WPU) via solution blending. TEM, FTIR, XRD, UV–vis analysis used to characterize morphology, composition, crystallization structure as-prepared nanohybrid. TCNC/Cu NP exhibited good dispersion interface compatibility WPU matrix. nanocomposite film obtained significantly enhanced mechanical, thermal stability scratch resistance properties, which was attributed a hydrogen bond network formed Additionally, colony count method performed test antibacterial properties various films. Compared pure film, all films showed better against Escherichia coli Staphylococcus aureus. ratio with addition (1:1) reach 99%. Furthermore, results ion sustained release experiment that had long-term effect, ascribed strong bonding between Thus, Cu firmly embedded formed. This work gives new approach prepare well mechanical properties.