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Polyethylene glycol and silica sol penetration improves hydrophobicity and dimensional stability of wood after a short-time treatment
European Journal of Wood and Wood Products ( IF 2.4 ) Pub Date : 2021-05-04 , DOI: 10.1007/s00107-021-01710-5
Jun Jiang , Yujie Zhou , Changtong Mei , Jinzhen Cao

Polyethylene glycol (PEG) and silica sol were used to improve the dimension stability and hydrophobicity of wood with different moisture contents (MC after oven drying, air drying: 10–12% and steam conditioning: 38–40%) via 24 h immersion treatment. The water in wood served as a medium for helping PEG diffusion into cell wall, resulting in a better dimensional stability for 38–40% MC wood. PEG impregnation could improve the dimensional stability but decrease the surface hydrophobicity due to its moisture affinity. PEG concentration (10, 20, and 30 wt.%) showed little influence on water contact angles (WCA) of treated wood. Silica sol impregnation could improve the dimensional stability and WCA. It was ascribed to the -OH consumption and filling effect in wood caused by silica sol networks. After combination treatment (one-step or two-step method), PEG and silica sol could provide a synergistic effect on improving dimensional stability and hydrophobicity of wood owing to the bulking effect and filling effect, respectively. In one-step method, as a lubricant and bulking agent, PEG could improve the ductility of the film formed by stiff silica via Si–O–Si cross-linked sol in wood. Moreover, the decreased surface hardness and compression strength of PEG treated wood were compensated by silica incorporation.



中文翻译:

短时间处理后,聚乙二醇和硅溶胶的渗透改善了木材的疏水性和尺寸稳定性

通过24小时浸泡处理,使用聚乙二醇(PEG)和硅溶胶来改善具有不同水分含量(干燥后的MC,风干:10–12%和蒸汽调节:38–40%)的木材的尺寸稳定性和疏水性。木材中的水用作帮助PEG扩散到细胞壁的介质,从而使38-40%的MC木材具有更好的尺寸稳定性。PEG浸渍可以改善尺寸稳定性,但由于其湿润亲和力而降低了表面疏水性。PEG浓度(10、20和30 wt。%)对处理过的木材的水接触角(WCA)几乎没有影响。硅溶胶的浸渍可以改善尺寸稳定性和WCA。这归因于二氧化硅溶胶网络引起的木材中-OH的消耗和填充效应。经过组合处理(一步或两步方法)后,PEG和硅溶胶分别由于填充效果和填充效果,可以在改善木材的尺寸稳定性和疏水性方面发挥协同作用。一步法,PEG作为润滑剂和填充剂,可以改善由硬硅石通过Si-O-Si交联溶胶在木材中形成的薄膜的延展性。而且,通过掺入二氧化硅可以补偿经PEG处理的木材的降低的表面硬度和抗压强度。

更新日期:2021-05-04
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