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Molecules

Title:		Nanocellulose-Reinforced Polyurethane for Waterborne Wood Coating
Author(s):		Kong L; Xu D; He Z; Wang F; Gui S; Fan J; Pan X; Dai X; Dong X; Liu B; Li Y;
Address:		"State Forestry and Grassland Administration Key Laboratory of Silviculture in Downstream Areas of the Yellow River, Shandong Agricultural University, No. 61 Daizong Road, Taian 271018, China. Qingdao Institute of Biomass Energy and Bioprocess Technology, Chinese Academy of Sciences, No.189 Songling Road, Qingdao 266101, China. Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China. State Forestry and Grassland Administration Key Laboratory of Silviculture in Downstream Areas of the Yellow River, Shandong Agricultural University, No. 61 Daizong Road, Taian 271018, China. dxiaoying1982@163.com. Shandong Laucork Develepment Co. Ltd., Room 401, building A2, High-tech Zone, Jining 272100, China. liubaoxuan123@126.com. State Forestry and Grassland Administration Key Laboratory of Silviculture in Downstream Areas of the Yellow River, Shandong Agricultural University, No. 61 Daizong Road, Taian 271018, China. lyf288@hotmail.com"
Journal Title:		Molecules
Year:		2019
Volume:		20190829
Issue:		17
Page Number:		-
DOI:		10.3390/molecules24173151
ISSN/ISBN:		1420-3049 (Electronic) 1420-3049 (Linking)
Abstract:		"With the enhancement of people's environmental awareness, waterborne polyurethane (PU) paint-with its advantages of low release of volatile organic compounds (VOCs), low temperature flexibility, acid and alkali resistance, excellent solvent resistance and superior weather resistance-has made its application for wood furniture favored by the industry. However, due to its lower solid content and weak intermolecular force, the mechanical properties of waterborne PU paint are normally less than those of the traditional solvent-based polyurethane paint, which has become the key bottleneck restricting its wide applications. To this end, this study explores nanocellulose derived from biomass resources by the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidation method to reinforce and thus improve the mechanical properties of waterborne PU paint. Two methods of adding nanocellulose to waterborne PU-chemical addition and physical blending-are explored. Results show that, compared to the physical blending method, the chemical grafting method at 0.1 wt% nanocellulose addition results in the maximum improvement of the comprehensive properties of the PU coating. With this method, the tensile strength, elongation at break, hardness and abrasion resistance of the waterborne PU paint increase by up to 58.7%, ~55%, 6.9% and 3.45%, respectively, compared to the control PU; while the glossiness and surface drying time were hardly affected. Such exploration provides an effective way for wide applications of water PU in the wood industry and nanocellulose in waterborne wood coating"
Keywords:		"Cellulose/*chemistry/ultrastructure Coated Materials, Biocompatible/*chemistry Cyclic N-Oxides/chemistry Hardness Humans Materials Testing Nanostructures/*chemistry/ultrastructure Oxidation-Reduction Polyurethanes/*chemistry Tensile Strength Water/chemist;"
Notes:		"MedlineKong, Linglong Xu, Dandan He, Zaixin Wang, Fengqiang Gui, Shihan Fan, Jilong Pan, Xiya Dai, Xiaohan Dong, Xiaoying Liu, Baoxuan Li, Yongfeng eng SWZ-MS201912/Key Laboratory of Bio-based Material Science & Technology(Northeast Forestry University), Ministry of Education/ 2016YFD0600704/Key Special Foundation for the National Key Research and Development Program of China/ 31700497/National Natural Science Foundation of China/ Switzerland 2019/09/01 Molecules. 2019 Aug 29; 24(17):3151. doi: 10.3390/molecules24173151"