微孔聚丙烯膜表面胺基化修饰

Aminated modification of microporous polypropylene membrane surface

摘要:

发展了一种胺基接枝密度和分布可控的微孔聚丙烯膜(MPPM)表面修饰方法。首先通过紫外光接枝聚合法，在MPPM上接枝聚丙烯酸甲酯(PMA)；然后通过丙烯酸甲酯和乙二胺的酰胺化缩合和Mickeal加成交替反应，将胺基可控地接枝到MPPM表面。采用FTIR、XPS和ESEM对胺基化膜表面的化学组成及物理形态进行了表征；考察了胺基化膜的表面亲水性及渗透性能。结果表明，胺基化膜表面亲水性显著改善，吸水量可达1311.29?7.56 ?g/cm2，为未修饰MPPM的145倍；制得的胺基化膜具有良好的水通量和金属离子渗透性能。

Abstract:

A facile microporous polypropylene membrane (MPPM) surface modification method was developed with controllable grafting density and distribution of amino groups in this paper. Firstly, polymethyl acrylate (PMA) was grafted on the MPPM surface via UV graft polymerization. Then, the grafted membrane was alternately performed the amidation condensation and Michael addition reaction with ethylenediamine and methyl acrylate as the raw reactants for several times. The aminated membranes were characterized by Fourier transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS) and environmental scanning electron microscopy (ESEM). The aminated membranes show greatly enhanced surface hydrophilicity and can adsorb water up to 1311.29±97.56 μg/cm2, which is 145 times as much as that of the origin membrane. Furthermore, the aminated membranes have satisfactory performance for water flux and metal ions permeability.