远程氩气等离子体引发接枝丙烯酸改性聚丙烯微孔膜的研究

Graft Polymerization of Poly(propylene) Microporous Membrane Induced by Remote Argon Plasma

采用远程氩气等离子体对聚丙烯(PP)微孔膜进行表面亲水处理,并引发接枝丙烯酸单体实现永久亲水改性。研究了放电参数及样品位置对于亲水性及接枝率的影响,并运用扫描电镜(SEM)、红外光谱(FTIR)和光电子能谱(XPS)对等离子体处理后的微孔膜进行了表面分析。实验结果显示等离子体功率对处理后的微孔膜的表面亲水性和接枝率有较大影响:在低功率时,放电中心位置的微孔膜经等离子体处理后亲水性最好,同时该位置的接枝率也相应最大;而在高功率时,则是距放电中心20cm位置的微孔膜的亲水性和接枝率优于其他位置。红外光谱显示在低功率时膜表面有羧基生成,而在高功率时则仅生成醛基酮基羰基。对于高功率等离子体处理后的PP微孔膜,SEM结果显示在放电中心位置的膜表面有丝状胶合现象发生,XPS结果显示在距放电中心20cm位置处的膜表面含氧量增加最多。

The poly （pmpylene） micropomus membranes were modified by graft polymerization in acrylic acid, induced by remote argon plasma. The influence of the surface modification conditions on hydrophilicity of the membrane was studied. Its microstructures and properties were characterizcd with contact angle measurement, scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy （F13R）, and X-ray photoelectron spectroscopy （XPS）. The resuhs show that the plasma power significantly affects the graft polymerization and hydrophilicity of the membrane. At a low plasma power, an area of the membrane exposed to the discharge center shows much better hydmphilicity and higher graft polymerization than those of the other areas. However, at a high plasma power, the optimal area moves 20 cm away from the plasma discharge center. Besides, the plasma power produces different radicals in the membrane. The possible mechanisms were also tentatively discussed.