空气等离子体处理时间对聚丙烯微孔膜微观结构与亲水性的影响

The Effect of Air Plasma Treated Time on Microstructure and Hydrophilcity of Polypropylene Microporous Membranes

对单轴拉伸法方法制备的聚丙烯微孔膜进行不同时间的空气等离子处理。利用表面光电子能谱和水接触角研究等考察离子处理时间对微孔膜亲水性的影响，利用扫描电子显微镜研究等离子处理时间对微孔膜微观结构的影响。结果表明，等离子处理3s时，微孔膜表面因接枝上氧和氮元素而使亲水性大幅度提升，微观结构无明显破坏；当等离子处理时间在6～30s之间，微孔膜的亲水性随处理时间的增加而提高，但微观结构破坏明显（桥结构断裂消失、微孔尺寸改变、出现较大孔洞）。

Polypropylene microporous membranes produced by way of uniaxial stretching were surface- modified by air plasma treatment for different time. The effect of plasma treatment time on the surfacehydrophilicity of microporous membranes was monitored by X-ray photoelectron spectroscopy and water contact angle measurement. Morphological changes on the membrane surface were characterized by scanning electron microscope. The result shows that the hydrophilicity of mieroporous membranes increases significantly without obvious destruction of microstructure when it is treated by air plasma for 3 s. During air plasma treatment from 6 s to 30 s, the hydrophilicity of the modified membrane increases with the increase of plasma treatment time, while the microstructure of membranes is obviously destroyed （as the disappearance of the ＂bridging structure＂, change of micropore size, formation of big pores）.