竹材表面冷等离子体改性后的时效性

用冷等离子体处理带有竹青和竹黄的竹材表面,用水和二碘甲烷测试不同放置时间下竹片表面接触角,根据Kaelble公式计算表面自由能及其分量.结果表明:冷等离子体改性后的竹片表面自由能显著提高,竹青和竹黄较改性前分别提高71.7%和39.4%.改性后竹片表面自由能随放置时间的增长逐渐降低,6-10 d内活性降低比较迅速,在28～42 d后接近于改性前水平,竹青的变化趋势较竹黄明显.

The Study on the Activation Time of Bamboo Surface Modified by Low Temperature Plasma

This article describes that,modifying the surface of bamboo strip with bamboo green hypoderm and the tissue inside hypoderm by low temperature plasma,test the contacting angle with water and diiodomethane every certain time,and then calculating surface free energy and other parameters according to Kaelble expression.The result indicates: the surface free energy of treated bamboo comparing with that of untreated one increases prominently,but decreases gradually with the time goes on.Activation declines prominently during the time of six to ten days,and almost disappears until four to six weeks.The changing trend of bamboo green hypoderm is much prominent than that of the tissue inside hypoderm.