PVDF-g-PAA共聚物的制备及其改性PVDF膜

发布时间：2018-03-12 15:29

本文选题：聚偏氟乙烯　切入点：丙烯酸　出处：《华南师范大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：为了改善聚偏氟乙烯(PVDF)膜的亲水性,通过自由基聚合法,以水/乙醇混合溶液为溶剂,合成了以PVDF为主链,聚丙烯酸(PAA)为侧链的PVDF-g-PAA两亲性共聚物.通过改变丙烯酸(AA)体积分数合成了3种不同接枝率(GP)的PVDF-g-PAA共聚物,红外(FT-IR)及热重分析(TGA)结果显示接枝率以AA单体体积分数10%为最高.以PVDF-g-PAA共聚物为膜材料,采用浸没沉淀法制备膜,通过扫描电子显微镜(SEM)、接触角测试和过滤实验研究膜的性能.结果表明,随着接枝率的升高,改性膜的平均孔径及孔隙率随之增大,接触角随之降低,表明亲水性有很大改善.在保持较好分离效果的基础上,改性膜的水通量及通量恢复率比原膜分别提高了3.78倍和0.76倍,表明其渗透性能及抗污染性能都有很大改善.
[Abstract]:In order to improve the hydrophilicity of polyvinylidene fluoride (PVDF) membrane, the PVDF chain was synthesized by free radical polymerization with water / ethanol mixed solution as solvent. PVDF-g-PAA amphiphilic copolymers were prepared by changing the volume fraction of acrylic acid. Three kinds of PVDF-g-PAA copolymers with different grafting rates were synthesized. The results of IR FT-IR and TGA showed that the highest grafting rate was AA monomer 10%. The PVDF-g-PAA copolymer was used as the membrane material to prepare the membrane by immersion precipitation method. The performance of the modified membrane was studied by SEM, contact angle test and filtration experiment. The results show that the average pore size and porosity of the modified membrane increase with the increase of grafting ratio, and the contact angle decreases. The results showed that the water flux and flux recovery rate of the modified membrane were 3.78 and 0.76 times higher than that of the original membrane respectively, which indicated that the permeability and anti-pollution performance of the modified membrane were improved greatly.
【作者单位】：华南师范大学化学与环境学院;
【基金】：国家自然科学基金项目(21203067)
【分类号】：TQ051.893

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