单双极性辉光等离子体处理有机高分子材料

为提高有机高分子材料的表面活性, 分别采用单极性脉冲、双极性脉冲两种等离子体放电模式对三种不同有机高分子材料表面进行活化处理, 通过红外光谱和接触角测量, 探究两种不同放电模式对不同材料等离子体活化浸润性的影响, 同时考察活化后不同材料浸润性随时间的变化趋势。研究结果表明, 两种不同放电模式下活化所得表面的浸润性都得到显著提高, 双极性脉冲放电模式活化效果优于单极性脉冲放电模式;由红外光谱分析可知, 环氧树脂材料经等离子体活化后出现了分子间氢键O-H、醚键C-O-C;氰酸酯经等离子体活化后出现了氢键C-H、羧基-COOH;聚四氟乙烯经等离子体活化后出现了C-C、C-F、C-F₂、C-F₃、C-O等极性键;随保存时间的增加, 接触角均呈增大趋势, 表面亲水性能下降。

Surface Modification of Organic Polymer Materials with Unipolar Pulse Glow Plasma

We experimentally addressed the surface modification of organic polymer materials, such as epoxy-resin (EP), cyanate-ester (CY) and polytetrafluoroethylene (PTFE) materials, with unipolar and bipolar plasma discharges.The influence of the plasma discharge on the wettability was investigated with infrared spectroscopy, X-ray photoelectron spectroscopy and contact angle measurement.The results show that the surface modification with unipolar and bipolar plasma discharges had a major impact.To be specific, when it comes to significant improvement of wettability, bipolar plasma discharge outperforms unipolar one.The plasma discharge accounted for the creation of quite a few polar bonds by breaking surface non-polar bonds, for instance O-H and C-O-C bonds for EP; C-H and -COOH bonds for CY; and C-C, C-F, C-F₂, C-F₃ and C-O bonds for PTFE.However, as the storage time increased in air, the hydrophilicity decreased simply because the surface density of polar bonds decreased.