Antifouling PVDF ultrafiltration membranes incorporating PVDF-g-PHEMA additive via atom transfer radical graft polymerizations
Antifouling PVDF ultrafiltration membranes incorporating PVDF-g-PHEMA additive via atom transfer radical graft polymerizations
复制标题
通过原子转移自由基接枝聚合掺入 PVDF-g-PHEMA 添加剂的防污 PVDF 超滤膜
DOI：
10.1016/j.memsci.2012.03.055
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发表时间：
2012-09-15
影响因子：
9.5
通讯作者：
Gao, Congjie
中科院分区：
文献类型：
--
作者：
Sui, Yan;Wang, Zhining;Gao, Congjie
采用原子转移自由基聚合（ATRP）法合成了聚偏氟乙烯-接枝-聚甲基丙烯酸羟乙酯（PVDF-g-PHEMA）两亲性共聚物添加剂，研究了其对聚偏氟乙烯（PVDF）超滤膜过滤性能的影响。在浇铸过程中，PVDF-g-PHEMA添加剂分离以在所有共混膜表面（包括内部孔）上形成PHEMA刷层。以聚合时间和单体含量为自变量，分别控制PHEMA在PVDF上的接枝量。PHEMA的接枝率取决于单体的分子数（Mn），其随聚合时间和单体含量的增加而增加。PVDF-g-PHEMA的多分散性指数在整个反应期间保持在约1.21-1.45的窄Mw/Mn。用傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）研究了共聚物和共混膜的化学组成。用扫描电子显微镜（SEM）研究了共混膜的形态结构.结果表明，PHEMA刷能提高PVDF膜的纯水通量和抗蛋白质吸附能力。以PEG 20000为致孔剂的共混膜比以PEG 400为致孔剂的共混膜具有更好的透水性，这是由于PEG 20000在PVDF膜表面形成了较大的孔径，并且部分PEG 20000与PVDF基体中的共聚物缠结在一起。优异的抗污染性能有望延长UF膜的使用寿命，而无需进行积极的清洁程序。(C)2012爱思唯尔有限公司版权所有。
The antifouling property of poly(vinylidene fluoride) (PVDF) ultrafiltration (UF) membrane incorporating the amphiphilic copolymer additive, poly(vinylidene fluoride)-graft-poly(hydroxyethyl methacrylate) (PVDF-g-PHEMA) synthesized via atom transfer radical polymerization (ATRP), has been investigated. During casting, the PVDF-g-PHEMA additive segregates to form a PHEMA brush layer on all blend membrane surfaces, including internal pores. Polymerization time and monomer content are used as the independent variables to manipulate the amount of grafted PHEMA on PVDF, respectively. The grafting yield of PHEMA is determined by molecular number (Mn) which is increased with the polymerization time and monomer content. The polydispersity index of PVDF-g-PHEMA remains narrow Mw/Mn at around 1.21-1.45 throughout the reaction. The chemical compositions of copolymer and blend membrane are investigated by Fourier transform infrared spectrometer (FT-IR) and X-ray photoelectron spectroscopy (XPS). The morphology of blend membrane is investigated by scanning electron microscopy (SEM). It is found that PHEMA brushes provide higher pure water flux and better anti-protein absorption ability to PVDF membranes. Water permeability of blend membrane using PEG20000 as pore-forming agent is excellent than that using PEG400 due to formation of larger pore sizes on the PVDF membrane surface and some PEG20000 tangling up with copolymers in PVDF matrix. The exceptional anti-fouling performance holds promise for extending UF membrane lifetimes without need for aggressive cleaning procedures. (C) 2012 Elsevier B.V. All rights reserved.