Surface Modification of Graphite Whisker for Composite Materials by Plasma

本课题的目的是应用等离子体聚合和等离子体处理技术对石墨晶须进行亲水性表面改性。结果总结如下：1。暴露于含氧或含氮化合物的等离子体中会产生亲水表面。2. 硝基化合物如硝基甲烷是制备亲水性等离子体聚合物的合适起始原料。氮氧化物如NO和NO_2是等离子体处理亲水性表面改性的理想气体。3. 等离子体处理引入表面的官能团是羟基、羰基和羧基，这些官能团有助于亲水性。4. 生成在表面上的官能团的浓度与处理表面的亲水性密切相关。5. NO-和no_2 -等离子体氧化石墨晶须表面，使其具有亲水性。6. 羰基和羧基被引入到石墨须表面，其浓度约为热HNO_3处理石墨的5倍。综上所述，NO-或no_2 -等离子体处理是石墨晶须亲水性改性的一种有效方法。

The objective in this project is the application of plasma polymerization and plasma treatment for hydrophilic surface modification of graphite whiskers. The results are summarized as follows.1. The exposure to plasma of oxygen- or nitrogen-containing compounds leads to hydrophilic surfaces. 2. Nitro compounds such as nitromethane are suitable starting materials for preparation of hydrophilic plasma polymers. Nitrogen oxides such as NO and NO_2 are suitable gases for hydrophilic surface modification by means of plasma treatment. 3. The functional groups introduced onto surfaces by the plasma treatment, which contribute to hydrophilicity, are hydroxyl, carbonyl, and carboxyl groups. 4. The concentration of the functional groups generated onto the surface is closely related to the hydrophilicity of the treated surface. 5. The NO- and NO_2-plasma oxidize the surface of graphite whiskers and make them hydrophilic. 6. Carbonyl and carboxyl groups are introduced onto the whisker surfaces by NO-plasma exposure, and their concentration is about five times more than that of the graphite treated with hot HNO_3.In conclusion, the NO- or NO_2-plasma treatment is a distinguished technique for hydrophilic modification of graphite whisker.