Membrane Science and Technology

Position：Home >> Abstract

Origin of delamination/adhesion in co-casting and the open structure

Authors： ZHANG Yunyan1, JI Yu1, SUI Bo2, LI Xuemei1*, YIN Yong1, WANG Zhouwei1, HE Tao1

Units： 1State-Key Lab of Material Oriented Chemical Engineering, College of Chemistry and Chemical Engineering,

KeyWords： co-casting; microfiltration; delamination; adhesion

ClassificationCode：TQ050.4+25; TQ028.8

year,volume(issue):pagination： 2011, 31(1):25-34

Abstract：

In this paper, PEI and PSf polymer solutions were used for co-casting. Mechanisms for delamination/adhesion were investigated. It was found that the contribution of the coagulation values of membrane solutions is insignificant to the adhesion of two layers. Instead, membrane shrinkage appears to play a significant role because composite membranes were obtained by minimising their shrinkage difference at the thickness direction by the increase of the coagulant temperature. In addition, the PVP in PSf solution also improves the adhesion between PEI and PSf layer. The open structure formation mechanism of PSf membrane was ascribed to a solvent enriched environment caused by the presence of PEI coating layer, which was confirmed by addition of a large amount of solvent into water coagulant. Finally, the concave defects formation on PSf surface was proposed as the impact of the growth of finger-like macrovoids in PEI layer. The results provides a solid theoretical basis for the expanding the application of co-casting technique.

Funds：

国家重大基础研究973项目(No.2009CB623402), 材料化学工程国家重点实验室基金(No.38901120),自然科学基金(No.20976083)

AuthorIntro：

张云燕（1987-）,女,甘肃白银市人,硕士研究生,主要从事有机高分子膜制备和应用的研究.( kzfeiyan@163.com).

Reference：

[1] Baker R W. Membrane Technology and Application[B]. JohnWiley & Sons Ltd, 2004. USA.
[2] Lioyd D R, Kinzer K E, Tseng H S. Microporous membrane fo- rmation via thermally-induced phase separation.(I) Solid-liquid phase separation[J]. J Membr Sci, 1990, 52: 239-261.
[3] Zeman L, Fraser T. Formation of air-casting cellulose acetate membrane. Part I. Study of macrovoid formation[J].
J Membr Sci, 1993, 84: 93-106.
[4] Zeman L, Fraser T. Formation of air-casting cellulose
acetate membrane. Part. Kinetics of demixing and
macrovoid gro- wth[J]. J Membr Sci, 1994, 87: 267-279.
[5] Strathmann H, Koch K. The formation mechanism of phase inversion membranes[J]. Desalination 1977, 21:241-249.
[6] Kesting R E. Phase inversion membranes[J].John Wiley, 1985, 269:131-152.
[7] Mulder M. 膜技术基本原理[B]. 第二版. 北京:清华大学出版社, 1999.
[8] Wang D L, Li K, Teo W K.Relationship between mass ratio of nonsolvent-additive to solvent.in membrane casting solution and its coagulation value[J]. J Membr Sci, 1995, 98: 233-240.
[9] Li X M, Ji Y, He T. A Sacrificial-layer Approach to Prepare Mi- crofiltration Membranes[J]. J Membr Sci, 2008, 320: 1-7.
[10] 何涛,李雪梅,李战胜.一种多孔分离膜的制备方法[P].中国, CN 101091880A,2007年12月26日.
[11] Li D F, Chung T S, Wang R.Morphological aspects and struc- ture control of dual-layer asymmetric hollow fiber membranes formed by a simultaneous co-extrusion approach[J]. J Membr Sci, 2004, 243: 155-175.
[12] Grobe V, Albrecht W, Makschin W etal .Multilayer
membran-
es I. A new type of asymmetric synthetic
membranes[J]. Syn Poly Membr, 1987.127-140
[13] Cristina C P, Nobrega R, Peinemann K V etal. Hollow fiber membranes obtained by simultaneous spinning of two poly- mer solutions: a morphological study[J]. J Membr Sci, 2003, 226: 35-50.
[14] Cristina C P, Nobrega R, Cristiano P B. Membranes obtained by simultaneous casting of two polymer solutions[J]. J Membr Sci, 2001, 192: 11-26.
[15] Luciana T D, Cristina C P, Claudio H etal. Polyurethane/p- ol-yethersulphone composite hollow fibers produced by simult - aneouss pinning of two polymer solutions[J]. J Membr Sci, 2008, 311: 12-22.
[16] Li D F, Chung T S, Wang R etal. Fabrication of fluoropolyi-mide/polyethersulfone (PES) dual-layer asymmetric hollow fiber membranes for gas separation[J]. J Membr Sci, 2002, 198: 211-223.

Service：

【Download】【Collect】

《膜科学与技术》编辑部 Address: Bluestar building, 19 east beisanhuan road, chaoyang district, Beijing; 100029 Postal code; Telephone：010-80492417/010-80485372; Fax：010-80485372 ; Email：mkxyjs@163.com