High-pressure densification and hydrophobic coating for enhancing the mechanical properties and dimensional stability of soft poplar wood boards

文献类型： 外文期刊

第一作者： Yu, Yong

作者： Yu, Yong;Li, Aqiang;Yan, Kaiya;Zhu, Songming;Yu, Yong;Li, Aqiang;Yan, Kaiya;Zhu, Songming;Ramaswamy, Hosahalli S.;Li, Huanhuan

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关键词： High-pressure densification; Low-density wood densification; Hardness improvement; Tung oil and epoxy resin-coated treatments

期刊名称：JOURNAL OF WOOD SCIENCE （ 影响因子：2.17； 五年影响因子：2.415 ）

ISSN： 1435-0211

年卷期： 2020 年 66 卷 1 期

页码：

收录情况： SCI

摘要： Effects of high-pressure (HP) treatment on densification of poplar sapwood boards and subsequent coatings were evaluated. Tung oil (TO) and epoxy resin (ER)-coated treatments were used to improve the dimensional stability of HP-densified wood. The density of the wood after HP densification increased from 450 +/- 50 kg/m(3)for the control to 960 +/- 20 kg/m(3)at 125 MPa. This process also resulted in the average thickness of HP-densified boards to reduce significantly from 29.7 +/- 0.11 mm for the control to 18.8 +/- 0.53 mm after HP densification at 25 MPa and 14.3 +/- 0.10 mm after 125 MPa treatment for 30 s. The mechanical strength measured as the hardness of densified wood significantly increased from 35% at 25 MPa to 96% at 125 MPa treatment, compared to untreated wood. As expected both TO and ER-coated treatments significantly reduced set-recovery of densified wood when stored at four relative humidity environments. ER showed better anti-swelling performance than TO, and would be a better choice.

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