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Wood Science and Technology

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16.04.2021 | Original

Sodium silicate/waterborne epoxy resin hybrid-modified Chinese fir wood

verfasst von: Zhenyu Sun, Jianxiong Lv, Zhangheng Wang, Yiqiang Wu, Guangming Yuan, Yingfeng Zuo

Erschienen in: Wood Science and Technology | Ausgabe 3/2021

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Abstract

The use of fast-growing wood can reduce the environmental impact of the wood industry, but the low strength and flammability of these woods prevent their widespread application. Chinese fir not only has the general defect of fast-growing wood, but also has weak permeability due to aspirated pits. To improve its performance, environment-friendly modifier sodium silicate (SS) and WEP (waterborne epoxide resin) as the dipping solution, microwave pretreatment and multi-step emptying-pressure (MSEP) impregnation method were employed to prepare hybrid-modified wood. Microwave pretreatment was found to destroy pit membranes of Chinese fir and increase permeability. WEP addition reduced the wood’s -OH content and promoted formation of more Si–O–Si structures, while also forming a fusiform hybrid structure with SS through Si–O–C bonds. The mechanical properties and water resistance of SS/WEPW (hybrid-modified wood) were higher than those modified by SS alone. The bending strength, elastic modulus, compressive strength, and transverse, tangential, and radial hardness of SS/WEPW5% (5% WEP) reached 97.20, 8504.87, 57.73, 5113.50, 2536.37, and 2192.35 MPa, respectively. The water resistance performance was also significantly improved. Compared with SSW, the 7-day weight leaching ratio (WLR) and water absorption rate (WAR) were reduced by 49.26 and 11.09, respectively, and the 14-day anti-shrink efficiency (ASE) of SS/WEPW5% can reach 86.87%. Furthermore, the flame retardant and smoke suppression performances of hybrid-modified wood were also improved, with the heat release rate (HRR), smoke produce rate (SPR), mean carbon monoxide yield (mean COY), and mean carbon dioxide yield (mean CO₂Y) of SS/WEPW5% significantly lower and the peak of CO and CO₂ release almost 1/10th that of unmodified wood. SS/WEP hybrid-modified wood was improved in terms of mechanical properties, water resistance performance, and flame retardancy, which laid the foundation of its use as a high-performance wooden material.

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Titel: Sodium silicate/waterborne epoxy resin hybrid-modified Chinese fir wood
verfasst von: Zhenyu Sun
Jianxiong Lv
Zhangheng Wang
Yiqiang Wu
Guangming Yuan
Yingfeng Zuo
Publikationsdatum: 16.04.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: Wood Science and Technology / Ausgabe 3/2021
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-021-01287-5

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