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Open AccessArticle

Application of Eco-Friendly Waterborne Polyurethane Composite Coating Incorporated with Nano Cellulose Crystalline and Silver Nano Particles on Wood Antibacterial Board

College of Materials Science and Engineering, Nanjing Forestry University, 159 Longpan Road, Xuanwu District, Nanjing 210037, China
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Polymers 2020, 12(2), 407; https://doi.org/10.3390/polym12020407
Received: 20 November 2019 / Revised: 11 January 2020 / Accepted: 14 January 2020 / Published: 11 February 2020
(This article belongs to the Special Issue Polymer Hybrid Composites)
To endow wood plate with antimicrobial properties, waterborne polyurethane (WPU) coatings incorporated with nano cellulose crystalline (NCC) and silver nanoparticles (AgNPs) were prepared. AgNPs were obtained by the chemical reactions of silver nitrate solution and sodium borohydride solution. The scribe testing results showed that the adhesion of the NCC-WPU composites was improved with the addition of NCC. The adhesion reached its peak when the amount of NCC added was 1%. Scanning electron microscopy (SEM) observation displayed that the NCC dispersed into the WPU without aggregation. NCC was well able to bind WPU and wood cell walls tightly together. Atomic force microscopy (AFM) and ultraviolet-visible (UV-vis) results revealed that WPU/NCC/AgNPs composites were homogeneous. This compatibility was also confirmed by transmission electron microscopy (TEM) analysis. The antibacterial property was improved too. When the adding amount of NCC was 0.5%, and the proportion of silver elements added was 5%, the antibacterial effect was at its best. As a comparison, the antibacterial effect of hybrid colloid without the addition of NCC was far less than that of including NCC. The WPU/NCC/AgNPs composite could be applied as an antibacterial coating in wood materials. View Full-Text
Keywords: nano cellulose crystalline; waterborne polyurethane; silver nano particles; antibacterial property; adhesion nano cellulose crystalline; waterborne polyurethane; silver nano particles; antibacterial property; adhesion
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Cheng, L.; Ren, S.; Lu, X. Application of Eco-Friendly Waterborne Polyurethane Composite Coating Incorporated with Nano Cellulose Crystalline and Silver Nano Particles on Wood Antibacterial Board. Polymers 2020, 12, 407.

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