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    Effect of Hydrophobic Modification on Mechanical Properties of Chinese Fir Wood

    Year: 2018

    Journal: BioResources, Volume 13, page 2035–2048

    Authors: Yang, Rui; Zhang, Jie; Wang, Siqun; Mao, Haiyan; Shi, Yilin; Zhou, Dingguo

    Organizations: National Natural Science Foundation of China [31500483]; Jiangsu Province Science Foundation for Youths [BK20150876]; Youth Innovation Fund of Nanjing Forestry University [CX2016020]; Tennessee Experimental Station Project [TEN00510]

    Keywords: Cell wall; Nanoindentation; Wettability; Hydrophobicity; Wood

    The water repellency, elastic modulus, and hardness of hydrophobic-treated and untreated wood cell walls were investigated. Chinese fir (CF; Cunninghamia lanceolata (Lamb.) Hook) wood was modified using polydimethylsiloxane (PDMS) and dimethyldichlorosilane (DMDCS) dissolved in n-hexane at 2%, 5%, and 8% (w/w) for 5 min, 30 min, and 2 h, respectively. A hydrophobic property was observed in the modified wood. The water contact angle value of the untreated wood surface was 85 degrees, but after treatment this value increased to 147 degrees and 143 degrees for the PDMS-and DMDCS-treated wood, respectively. Increases in the elastic modulus and hardness of the wood cell wall were observed after PDMS treatment. These treatments also improved the water repellency of the wood surface, as verified by the reduction of the hydroxyl group O-H stretching vibrations at 3328 cm(-1). Compared to DMDCS, the PDMS treatment improved the hydrophobicity of wood surfaces and increased the nanomechanical properties of the wood cell wall. When an 8% concentration of PDMS and a 2 h treatment time were used, the treated wood showed the best mechanical properties.
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