在10~20 Pa高真空环境和100~350 W功率条件下，采用氧等离子体对稻秸进行改性处理3~7 min，并对改性前后的稻秸进行表面光电子能谱(XPS)分析，以揭示稻秸界面特性的变化规律。结果表明，氧等离子体可对秸秆进行有效的刻蚀和接枝。通过等离子体处理，秸秆表层碳元素含量显著降低，而氧元素含量大幅度上升；秸秆表面的C—C/C—H键含量显著降低，而强极性的羰基、羧基—CO/—COOH含量显著增加，有助于脲醛树脂对秸秆的润湿和渗透。XPS分析表明，稻秸表面包含长链脂肪烃外层和含硅无机矿物质内层，对合成树脂的渗透和胶合产生了阻碍。

Rice straw is naturally covered by a thin layer of aliphatic hydrocarbon and inorganic substances, which prevents urea formaldehyde (UF) resin from penetrating into straw body and producing strong adhesion. The change law of rice straw interfacial properties was revealed by treating the rice straw surface with oxygen cold plasma for 3—7 min at 10—20 Pa and 100—350 W, and analyzing the sample before and after plasma modification with Xray photoelectron spectroscopy (XPS). The results showed that plasma could effectively etch and graft some new functional groups on the rice straw surface. After plasma treatment the content of carbon atom was significantly decreased and the content of oxygen atom was obviously increased on the surface of rice straw. It was helpful for wetting and permeating of the straw surface by urea formaldehyde resin when the C—C/C—H nonpolar bonds were remarkably reduced and the polar functional groups carbonyl and carboxyl were significantly increased on the straw surface after treatment with oxygen cold plasma. It was found from XPS analysis that the rice straw surface layer was covered with an inner sublayer of mineral substances and outer aliphatic hydrocarbon substances.