Cheng Liangsong, Ren Shaobo, Lu Xiaoning
College of materials science and engineering, Nanjing Forestry University, 159 Longpan Road, Xuanwu District, Nanjing 210037, China.
Polymers (Basel). 2020 Feb 11;12(2):407. doi: 10.3390/polym12020407.
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.
为赋予木板抗菌性能，制备了含有纳米纤维素晶体（NCC）和银纳米颗粒（AgNPs）的水性聚氨酯（WPU）涂料。通过硝酸银溶液和硼氢化钠溶液的化学反应获得AgNPs。划痕测试结果表明，添加NCC后，NCC-WPU复合材料的附着力得到提高。当NCC添加量为1%时，附着力达到峰值。扫描电子显微镜（SEM）观察显示，NCC分散在WPU中无团聚现象。NCC能够很好地将WPU和木材细胞壁紧密结合在一起。原子力显微镜（AFM）和紫外可见（UV-vis）结果表明，WPU/NCC/AgNPs复合材料是均匀的。透射电子显微镜（TEM）分析也证实了这种相容性。抗菌性能也得到了改善。当NCC添加量为0.5%，银元素添加比例为5%时，抗菌效果最佳。作为比较，不添加NCC的混合胶体的抗菌效果远低于添加NCC的混合胶体。WPU/NCC/AgNPs复合材料可作为木材材料的抗菌涂层应用。
