聚丙烯微孔膜的等离子体接枝聚合改性

Utilization of Plasma Polymerization for Hydrophilic Microporous Polyprophylene Membranes

利用拉伸时的晶型转变致孔特性,从β晶相聚丙烯经单向或双向拉伸制得了新型聚丙烯微孔膜、用等离子体接枝聚合技术接上了亲水性聚合物如聚丙烯酸、聚丙烯腈等。研究了等离子体处理时间、单体性质对得到的亲水膜的亲水性、离子/溶质渗透性的影响。发现接枝聚丙烯酸的双向拉伸膜对Na^+、Mg^(++),尿素有较大的渗透性,并具有优良的形状稳定性。

Plasma polymerization techniques were utilized in the development of hydrophilic microporous polypropylene composite membranes for dialysis. The original polypropylene microporous membranes used were uniaxially and biaxially drawn polypropylene membranes in which the micropores were prodced via crystalline modification transformation. For comparison a commercial available polypropylene membrane, Celgard 2400 was also used. Effect of plasma polymerization time and monomer used on surface energy, water content and dialysis permeability of the resultant composite microporous polypropylene membranes were studied. The results indicated that the plasma modified biaxially drawn polypropylene membrane showed much higher permeability toward Na^+, Mg^(++) and urea which are 3.2×10^(-6), 5.8×10^(-8) and 1.75×10^(-6)cm^2/ min respectively for 60 min plasma polymerization time than the orignal one and had better dimensional stability.