乙烯等离子体处理的云母表面结构及表面性质

Surface Structure and Properties of Mica Treated with Plasma

用元素分析、色-质谱、裂解气相色谱和顺磁共振等方法研究了经乙烯等离子体处理的云母表面化学结构及处理过程。结果表明,云母颗粒表面形成了厚数十埃的等离子体聚乙烯膜,其化学结构与反应体系中无云母时得到的等离子体聚乙烯膜相同。通过扫描电镜观察到云母片表面的聚合膜具有规则的海星状花样,随处理时间的延长花样按比例长大。水与云母表面的接触角数据说明,乙烯等离子体处理使云母表面的疏水性提高到聚乙烯的水平,比氩气等离子体、硅烷偶联剂及钛酸酯偶联剂处理的效果均更为显著。

The chemical structure of mica surface treated with ethylene plasma of radio frequency and plasma polymerization reaction of ethylene in the presence of mica were studied by means of elemental analysis, GC-MS, PGC and ESR. It shows that the mica particle is wrapped by a dozens-of-angstroms-thick film, the chemical structure of which is the same as that polymerized in the absence of mica. Using SEM, we found for the first time the star fish-like morphology of plasma polymerized film. The 'star fish' expands with the plasma treating time while its shape remains unchanged. The contact angle of water on mica surface treated by different methods at various conditions was measured. The results indicate that hydrophobicity of mica surface resulting from ethylene plasma treatment is greater than that both from Ar Plasma treatment and from silicane or titanate coupling agents.