A simplified method for preparation of hydrophilic PVDF membranes from an amphiphilic graft copolymer
A simplified method for preparation of hydrophilic PVDF membranes from an amphiphilic graft copolymer
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DOI：
10.1016/j.memsci.2009.08.032
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发表时间：
2009-12-01
影响因子：
9.5
通讯作者：
Li, K.
中科院分区：
文献类型：
--
作者：
Hashim, N. Awanis;Liu, Fu;Li, K.
通过将PVDF聚合物粉末直接添加到两亲性共聚物混合物中，该混合物含有用原子转移自由基聚合（ATRP）方法接枝的聚（乙二醇）甲醚甲基丙烯酸酯（PEGMA）（PVDF-g-PEGMA）、溶剂和未反应的PEGMA，试图减少亲水性平板聚（偏二氟乙烯）（PVDF）膜制备过程中的步骤数量，从而减少总体成本。通过傅里叶变换红外衰减反射光谱(FTIR-ATR)、原子力显微镜(AFM)、扫描电子显微镜(SEM)和场发射扫描电子显微镜(FESEM)、纯水通量、接触角测量和蛋白质过滤实验对膜进行了表征。从 FTIR-ATR 光谱中观察到所得膜中存在由 PEGMA 引起的酯基和醚基。从SEM和FESEM观察发现，形成了具有薄皮层并伴有短指状和大孔隙结构的非对称膜，但当共聚物含量增加时，膜形态发生变化。 AFM 显示，PVDF-g-PEGMA 含量越高，膜的粗糙度越大。与纯PVDF膜相比，所制备的膜的纯水渗透通量显着增加至116 L/m(2) h，而接触角测量显示在57度至67度之间的中等值。对于用这种方法制备的所有膜，在蛋白质过滤后使用水清洗回收的污垢百分比为 100%。结果表明，新开发的方法可形成亲水且低污染的 PVDF 膜。由于膜的亲水性对污垢特性有显着影响，因此通过该工艺开发的亲水性 PVDF 膜预计不仅适用于生物分离，而且适用于废水处理。 (C) 2009 Elsevier B.V. 保留所有权利。
An attempt to reduce the number of steps and hence the overall costs involved in the preparation of hydrophilic flat sheet poly(vinylidene fluoride) (PVDF) membranes was made by adding PVDF polymer powders directly to an amphiphilic copolymer mixture containing PVDF grafted with poly(ethylene glycol) methyl ether methacrylate (PEGMA) (PVDF-g-PEGMA), solvent and unreacted PEGMA from the atom transfer radical polymerisation (ATRP) method. The membrane was characterised by Fourier transform infra-red attenuated reflection spectroscopy (FTIR-ATR), atomic force microscopy (AFM), scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM), pure water flux, contact angle measurement and protein filtration experiments. The presence of ester and ether groups attributable to the PEGMA in the resultant membrane was observed from FTIR-ATR spectra. From SEM and FESEM observations, an asymmetric membrane was formed with a thin skin layer accompanied by short finger-like and macrovoid structures, but the membrane morphology changed when the copolymer content was increased. AFM reveals that the roughness of the membranes becomes greater with higher amount of PVDF-g-PEGMA. The pure water permeation flux of the prepared membrane increased significantly to 116 L/m(2) h compared to pure PVDF membranes, while contact angle measurements show a moderate value of between 57 degrees and 67 degrees. The percentage of fouling recovered using water cleaning after protein filtration was found to be 100% for all membranes prepared from this method. The results suggested that hydrophilic and low-fouling PVDF membranes were formed from the newly developed method. Since membrane hydrophilicity has a pronounced effect on the fouling properties, hydrophilic PVDF membranes developed from this process are anticipated to be suitable not only for bio-separation, but also for wastewater treatment. (C) 2009 Elsevier B.V. All rights reserved.