等离子体改性聚合物表面动力学的动态接触角法研究

详细研究了有关高分子材料的动态接触角.对于未处理高分子材料,其前进接触角都大于后退接触角,有滞后现象主要是由于材料表面化学组成不均匀性引起的.经CF₄/CH₄等离子体处理后,使得前进接触角增大而后退接触角变化幅度较小,滞后程度增大是由于表面化学组成不均匀性增大引起的.聚合物薄膜经CF₄/CH₄等离子体处理在浸水过程中,表面动力学衰减常数随等离子体处理条件CF₄(%)的变化而变化,可将整个浓度区域分为三个区域,这是由于各区域内等离子体作用机制和改性聚合膜的性质不同而引起的.预先经CH₄等离子体处理的表面动力学衰减常数普遍小于未经CH₄等离子体前处理的表面动力学衰减常数,证实了高度交联的炭阻挡层可在一定程度上阻止表面动力学的运动.

Investigation of Polymer Surface Dynamics Modified by Plasma by Using Dynamics Contact Angle Method

The dynam ics contactangle ofsom e polym er m aterials is studied. For un- treated polym ers, itis found thatadvanced contactangle is greater than recede contact angle. Thehysteresisbetw een theadvanced contactangle and recedecontactangleisat- tributed to the heterogeneous ofthe chem icalcom position on the polym er surface. For thepolym er m aterialstreated by CF4/CH4 plasm a, itisfound thattheadvanced contact angle increasesgreatly com pared with the recede contactangle. Thehysteresisincreases because oftheincreasing ofchem icalcom position heterogeneouson thepolym ersurface. The surface dynam ics decay rate constant changes with the plasm a treatm entcondition ofCF4(% ) during the im m ersion ofw ater for the polym er film s is treated by CF4/CH4 plasm a. Thew holerangeofCF4(% )can bedivided into threeregions, which are distin- guished by their different plasm a m echanistic aspects, and different properties of the plasm a polym erized film s. The rate constantsofpolym erfilm pretreated by CH4 plasm a are low er than that of unpretreated polym er film s. It proves that an ultrathin barrier layerprovided by CH4 plasm a is effective to preventthe m ovem entofsurfacedynam ics.