纳米Fe_3O_4/PVDF磁性复合膜的原位制备及表征

Preparation and Characterization of Fe_3O_4/PVDF Magnetic Composite Membrane

通过膜相渗透原位化学沉积法制备了聚合物基Fe3O4/聚偏氟乙烯(PVDF)磁性纳米复合膜,研究了复合膜制备的适宜条件,采用红外光谱(FT-IR)、差热分析(DSC)、X射线衍射、扫描电镜(SEM)等手段对复合膜的组成、结构进行了表征和分析,通过气体渗透法测定了复合膜的孔径随制备条件的变化情况.FT-IR和XRD图谱结果表明,在基膜中原位生成Fe3O4后不影响基膜PVDF的分子结构;复合膜中的Fe3O4粒子尺寸为68 nm左右,复合膜的磁化率达0.044 cm3·g-1;复合膜的磁化率、平均孔径、最大孔径及孔径分布范围随反应条件的改变而有明显变化.

Fe3O4 nanoparticles were introduced into microporous poly (vinylidene fluoride) (PVDF) membrane by in-situ membrane phase permeating method and a magnetic composite Fe3O4/PVDF membrane was prepared. Optimum preparation conditions were studied. FT-IR and DSC study indicates that the introducing of Fe3O4 did not affect the PVDF structure and the composite membranes show good thermo-stability. Fe3O4 particle size calculated from XRD result is about 68 nm. The susceptibility of the resulting composite membrane reached 0.044 cm(3) . g(-1) and changed with reaction conditions. The variations of pore size of the composite membrane were investigated by gas permeating method. The maximum and average pore size, as well as pore size distribution, of the composite membranes are different from those of PVDF host membrane, and changed obviously with preparing conditions.