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耐壓型聚砜兩親嵌段共聚物超濾膜的制備與表征
作者:陳威 王召根* 汪勇* 
單位:南京工業大學 材料化學工程國家重點實驗室 南京 210009 
關鍵詞:嵌段共聚物 聚砜 超濾膜 海綿狀孔 耐壓性能 
分類號:TQ028.8
出版年,卷(期):頁碼:2018,38(6):27-33
摘要:

 聚砜類分離膜廣泛應用于超濾過程并作為支撐層用于納濾膜及反滲透膜的制備,然而由于材料自身的疏水性較強,聚砜膜通常要經過親水化改性來提升滲透和抗污染性能。以兩親嵌段共聚物聚砜-b-聚乙二醇(PSF-b-PEG)為原料,通過相轉化方法可無需后期改性制備具有指狀孔結構的自發永久親水性超濾膜,但指狀孔的存在使其耐壓性能受到限制,難以用作為納濾或反滲透膜的支撐層。本文采用PSF-b-PEG為制膜材料,通過調節固含量與非溶劑誘導相分離過程中的溶劑/非溶劑體系,將超濾膜斷面的指狀孔轉變為更為耐壓的海綿狀孔,同時在膜內保留親水鏈段以保證膜的滲透及抗污染性能。研究結果表明,當以N,N-二甲基甲酰胺(DMF)為溶劑,去離子水為凝固浴時,可直接制備出具有海綿狀孔結構的PSF-b-PEG超濾膜。在25%的固含量下,膜的純水滲透性為160 L·m-2·h-1·bar-1,對牛血清白蛋白(BSA)截留率達到90%。壓密測試表明,相較于指狀孔,海綿狀孔超濾膜可完全耐受1 MPa的壓力,展示了更優的耐壓性能。

 Polysulfone membranes are widely used as ultrafiltration membranes and the support layers for composite membranes. However, due to the strong hydrophobicity of the material itself, polysulfone ultrafiltration membranes need some modifications to enhance the penetration and anti-fouling performance. We have prepared permanently hydrophilic ultrafiltration membranes with finger-like pores by using amphiphilic block copolymer polysulfone-block-polyethylene glycol (PSF-b-PEG). In this paper, we try to prepare sponge-like membranes with the same material by changing solvent/nonsolvent system and the concentration of polymer solution. The results showed that when N,N-dimethylformamide (DMF) was used as solvent and deionized water was used as nonsolvent, a PSF-b-PEG ultrafiltration membrane with sponge-like structure could be directly prepared. The pure water permeability of the membrane reached 160 L·m-2·h-1·bar-1 and the rejection of bovine serum albumin (BSA) reached 90% under the concentration of 25%. The pressure-resistance test showed that the membranes with sponge-like structure have superior pressure resistance compared with the finger-like membranes.

基金項目:
國家重點基礎研究發展計劃項目(2015CB655301);國家自然科學基金項目(21776126);江蘇省自然科學基金項目(BK20150063);江蘇高校優勢學科建設工程(PAPD)
作者簡介:
第一作者簡介:陳威(1993-),男,江蘇淮安人,工學碩士,從事膜分離材料的研究與應用。 *通訊作者,E-mail:[email protected]; [email protected]
參考文獻:

 [1] 俞三傳, 金可勇, 高從堦. 高性能聚砜支撐膜研制[J]. 膜科學與技術, 1999, 19(6): 45-47.

[2] Rana D, Matsuura T. Surface modifications for antifouling membranes [J]. Chem Rev, 2010, 110(1-2): 2448-2471.
[3] Chen W, Wei M J, Wang Y. Advanced ultrafiltration membranes by leveraging microphase separation in macrophase separation of amphiphilic polysulfone block copolymers [J]. J Membr Sci, 2017, 525: 342-348.
[4] Jonsson G. Methods for determining the selectivity of reverse osmosis membranes [J]. Desalination, 1978, 24: 19-37.
[5] Ohya H. An expression method of compaction effects on reverse osmosis membranes at high pressure operation [J]. Desalination, 1978, 26: 163-174.
[6] Aerts P, Greenberg A R, Leysen R, et al. The influence of filler concentration on the compaction and filtration properties of Zirfon®-composite ultrafiltration membranes [J]. Sep Sci Technol, 2001, 22-23: 663-669.
[7] Yoo S H, Kim J H, Jho J Y, et al. Influence of the addition of PVP on the morphology of asymmetric polyimide phase inversion membranes: effect of PVP molecular weight [J]. J Membr Sci, 2004, 236: 203-207.
[8] Saljoughi E, Amirilargani M, Mohammadi T. Effect of poly(vinyl pyrrolidone) concentration and coagulation bath temperature on the morphology, permeability, and thermal stability of asymmetric cellulose acetate membranes [J]. J Appl Polym Sci, 2009, 111: 2537-2544.
[9] Persson K M, Gekas V, Tragardh G. Study of membrane compaction and its influence on ultrafiltration water permeability [J]. J Membr Sci, 1995, 100: 155-162.
[10] Mulder M著, 李琳譯, 膜技術基本原理 2nd [M]// 北京: 清華大學出版社, 1999: 82.
[11] Strathmann H, Kock K. The formation mechanism of phase inversion membranes [J]. Desalination, 1977, 21: 241-255.
[12] Zhang Z H, An Q F, Liu T, et al. Fabrication of polysulfone ultrafiltration membranes of a density gradient cross section with good anti-pressure stability and relatively high water flux [J]. Desalination, 2011, 269: 239-248.
[13] Yu L, Yang F, Xiang M. Phase separation in a PSf/DMF/water system: a proposed mechanism for macrovoid formation [J]. RSC Adv, 2014, 4: 42391-42402.
[14] Kim J H, Lee K H. Effect of PEG additive on membrane formation by phase inversion [J]. J Membr Sci, 1998, 138: 153-163.
[15] 李峰, 安全福, 高從堦等. 聚砜超濾膜結構對鑄膜溶液性質的依賴性[J]. 水處理技術,2009, 35(3): 23-26.
[16] 嚴昊, 徐建, 劉軼群等. 不同結構聚砜超濾膜對聚乙二醇的過濾性能研究[J]. 膜科學與技術, 2013, 33(5): 43-47.
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