HEMA远程等离子体聚合改性聚丙烯表面的结构及亲水性能

Chemistry Structure and Hydrophilicity of Polypropylene Surfaces Modified by Remote Plasma Polymerization from 2-Hydroxyethyl Methacrylate

采用甲基丙烯酸羟乙酯(HEMA)的远程等离子体聚合方法对聚丙烯(PP)表面进行改性,以聚合量、浸水失重、红外光谱(FT-IR)、扫描电镜(SEM)和水接触角等测试手段,研究了远程距离对改性表面的化学结构、形态结构及亲水性的影响。结果表明,随着远程距离的增加,由于等离子体中高能粒子的轰击、刻蚀作用减轻,HEMA逐渐从气相聚合过渡到表面聚合过程,改性表面的聚合量、酯基及羟基等基团含量、线性结构聚合物含量和表面亲水性能等随之提高,远程位置28.8cm样品表面保留的HEMA单体的羟基结构最多,接触角下降至18.6°。

A remote plasma polymerization technology was used to modify polypropylene surfaces with hydroxyethyl methacrylate （HEMA） as the monomer. Effects of sample positions in the remote plasma reactor on the chemistry structure, morphology structure and hydrophilicity of modified polypropylene surfaces were investigated by means of the polymerization amount measurement, Fourier transform infrared spectrum（FT-IR）, scanning electron microscope （SEM） and contact angle methods. HEMA monomer preferred to polymerize in gas phase in the direct plasma region, while through the surface polymerization mechanism in the remote plasma region. With sample positions far from the r.f. electrode, due to ion bombards and plasma etches on modified surfaces are relieved, the polymerization amounts, the reserves of the ester group and the hydroxyl group are significantly increased, and meanwhile, the surface hydrophilicity is more improved. The surface contact angle of modified polypropylene at the remote position of 28.8 cm is decreased to 18.6°.