丛生竹材润湿特性的比较研究

Comparative study on wettability of caespitose bamboos

为了丛生竹材工业化利用提供理论依据,采用比较手法对两种丛生竹材的动态润湿性能进行研究。结果表明:不同液体在不同竹材表面上的接触角都随时间增长以反函数模型呈减小趋势,斜率越来越小。甲酰胺和二碘甲烷在竹材表面形成的初始接触角较蒸馏水大。蒸馏水和甲酰胺在竹材表面的接触角随时间的变化曲线非常接近,从刚接触至2 s,接触角急剧减小,之后变化较缓。二碘甲烷在竹材表面的接触角随时间增长基本保持不变,只稍有下降。经不同处理后的龙竹和车筒竹材表面接触角随时间的变化曲线基本一致,且随时间增长接触角减小的速率越来越小。经过高温和硼酸处理后的竹材表面初始接触角较未处理材大10°左右,高温处理和防霉处理后的表面接触角差异较小。龙竹的润湿性优于车筒竹。

The dynamic wettability of Dendrocalamus giganteus and Bambusa sinospinosa have been studied by comparative method. The results show that contact angles of different liquid decreased with the time grew based on inverse functions model in different bamboo; and the slope became smaller with the time increased; the original contact angles of Diiodomethane and Formamide were larger than the distilled water on bamboo surface; the contact angle-time curves showed almost the same of distilled water and formamide on bamboo surface; first two seconds, the contact angle sharply decreased, then slowed down; While D. giganteus on the bamboo surface, the contact angle only had little decrease; Two caespitose bamboos after high temperature and boric acid treatments, the contact angletime curves had smaller slope with thetime grew; the bamboo surface contact angles after treated with high temperature and boric acid were bigger 10° than no treated bamboo, and the two treatments have almost effect on contact angle. D. giganteus has better wettability than B. sinospinosa.