title: TEMPO-oxidized cellulose nanofibers (TOCNs) as a green reinforcement for waterborne polyurethane coating (WPU) on wood.
abstract: In this work, TEMPO-oxidized cellulose nanofibers (TOCNs) were investigated as a green additive to the waterborne polyurethane (WPU) based coating, for improving its mechanical properties. The structure, morphology, mechanical properties and performances of the WPU/TOCNs coating were determined. Results showed that TOCNs had good compatibility to the WPU coating, and significantly enhanced the mechanical properties of the coating. The Halpin-Tsai and Ouali models were used to fit for the Young's modulus of the resulting coating, and good agreements were found between the Ouali model and experimental results when the TOCNs content exceeded the critical percolation threshold (0.7vol% or 1.0wt%). It was also found that the pencil hardness of the coating was improved with the addition of TOCNs. However, AFM and pull-off test revealed the negative effects of the TOCNs addition on the surface roughness and adhesion strength of the coating to the wood surface.
authors.affiliation: Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China; Limerick Pulp & Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
authors.forename: Dong
authors.initials: D
authors.lastname: Cheng
authors.affiliation: Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China. Electronic address: yangbingwen@tust.edu.cn.
authors.forename: Yangbing
authors.initials: Y
authors.lastname: Wen
authors.affiliation: Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China; Limerick Pulp & Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
authors.forename: Xingye
authors.initials: X
authors.lastname: An
authors.affiliation: Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China.
authors.forename: Xuhai
authors.initials: X
authors.lastname: Zhu
authors.affiliation: Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China; Limerick Pulp & Paper Centre, Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada. Electronic address: yonghao@unb.ca.
authors.forename: Yonghao
authors.initials: Y
authors.lastname: Ni
mesh_terms: D002483:Cellulose, Oxidized; D003497:Cyclic N-Oxides / Q000737:chemistry; D055119:Elastic Modulus; D006244:Hardness; D057139:Nanofibers / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry*; D014934:Wood / Q000737:chemistry*
chemical_list: D002483:Cellulose, Oxidized; D003497:Cyclic N-Oxides; D011140:Polyurethanes; C003959:TEMPO
keywords: Halpin-Tsai model; Mechanical properties; Modulus; Ouali model; TEMPO-oxidized cellulose nanofibers (TOCNs); Waterborne polyurethane coating