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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).

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