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Preparation, characterization and application of a chiral thermo-sensitive membrane for phenylalanine separation of the racemic mixture

  • Xia Feng
  • Qiang Zhang
  • Xiaotong Liang
  • Jinling Li
  • Yiping Zhao
  • Li Chen
Original Paper

Abstract

Poly(vinylidene fluoride)-grafting-poly(N-isopropylacrylamide) (PVDF-g-PNIPA), a thermo-sensitive polymer with a poly(vinylidene fluoride) (PVDF) backbone and poly(N-isopropylacrylamide) (PNIPA) side chains, was synthesized via radical copolymerization. Chiral micro-gels were synthesized with N-isopropylacrylamide (NIPA) and a chiral monomer that was obtained by an acrylation reaction with L-phenylalanine and acrylyl chloride. A novel chiral thermo-sensitive membrane for phenylalanine separation of the racemic mixture was prepared by a phase inversion method with a blend of chiral micro-gels and PVDF-g-PNIPA. Chemical composition and morphology of the membrane were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), respectively. The permeability, enantioselectivity, the resolution mechanism, the effects of temperature, blending ratio and type of enantiomer molecules on the chiral recognition properties were studied. The results showed the water flux of the membrane displayed a sensitivity to temperature and the permeability of D-phenylalanine was better than that of L-phenylalanine. Comparing with a chiral membrane at 40 °C the membrane at 25 °C obtained a larger percentage of enantiomeric excess (e.e.%). The values of e.e.% and the separation factor (α) at a temperature above the LCST were also much higher than that of membranes with no thermo-sensitivity at low temperature. The value of e.e.% and α increased with an increased blending ratio; when the blending ratio was 30 wt.% in the chiral blended membrane the value of e.e.% reached 10 %. The model of the chiral membrane could be described as a solution-diffusion model.

Keywords

Chiral resolution Phenylalanine Micro-gels Membrane Poly (N-isopropyl acrylamide) 

Notes

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Contract grant number: 21074091, 21174103, and 31200719), the Specialized Research Fund for the Doctoral Program of Higher Education (Contract grant number: 20121201110003 and 20121201120005) and the Program for Changjiang Scholars and Innovative Research Team in the University of Ministry of Education of China (Contract grant number: IRT13084).

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.State Key Laboratory of Hollow Fiber Membrane Materials and Processes, School of Materials Science and EngineeringTianjin Polytechnic UniversityTianjinChina

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