Pervaporation Performance of Polyelectrolyte PDDA/PSS Layer-by-layer Self-assembly Multilayer Membranes

Chem. J. Chinese Universities

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Pervaporation Performance of Polyelectrolyte PDDA/PSS Layer-by-layer Self-assembly Multilayer Membranes

ZHANG Peng, QIAN Jin-Wen^*, XUAN Li-Jing, AN Quan-Fu

Key Laboratory of Macromolecule Synthesis and Functionalization of Ministry of Education, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received:2008-03-19 Revised:1900-01-01 Online:2008-09-10 Published:2008-09-10
Contact: QIAN Jin-Wen

Abstract

Abstract: Membrane separation is one of the promising applications of layer-by-layer technology. Poly(diallyldimethylammonium chloride)/poly(styrenesulfonate sodium salt)(PDDA/PSS) multilayer membranes were self-assembled in polyelectrolyte solutions with different NaCl concentrations. The influences of NaCl concentration of the dipping solutions, number of bilayers and feed temperature on the pervaporation performance of PDDA/PSS multilayer membranes were investigated. Scanning electron microscope(SEM) was used for mea-suring the surface morphology of the PDDA/PSS multilayer membrane. The results of the pervaporation tests show that the PDDA/PSS membranes assembled in high NaCl concentration have a good pervaporation performance, which can be explained by the chain size of polyelectrolytes in dipping solutions and the structure of LbL membranes. The (PDDA/PSS)₆PDDA multilayer membrane assembled in 1 mol/L NaCl has separation factor 345 and permeate flux 2.51 kg·m^-2·h^-1 for separating 95% isopropanol isopropanol-water mixture at 55 ℃. An anti-“trade-off” phenomenon was found and was explained in term of the dependence of both solvent interaction and the swelling of LbL membrane on the feed composition.

Key words: Polyelectrolyte multilayer membrane, Layer-by-layer self-assembly, Pervaporation, Anti-“trade off” phenomenon

CLC Number:

O631

TrendMD:

ZHANG Peng, QIAN Jin-Wen^*, XUAN Li-Jing, AN Quan-Fu. Pervaporation Performance of Polyelectrolyte PDDA/PSS Layer-by-layer Self-assembly Multilayer Membranes[J]. Chem. J. Chinese Universities, doi: .

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Pervaporation Performance of Polyelectrolyte PDDA/PSS Layer-by-layer Self-assembly Multilayer Membranes

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