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Cryogenic induced phase separation of chitosan solution

A novel method for preparation of membrane with high porosity

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Chinese Science Bulletin

Abstract

The chitosan porous membrane was prepared by extending the principle of thermally induced phase separation (TIPS) for the polymer-diluent system to the polymer solution at arnbient temperature to carry out the cryogenic induced phase separation (CIPS). The porous membrane obtained was characterized by scanning electron microscopy (SEM) and gas permeability. It was found that a specific lacy pore structure morphology corresponding to the TIPS’ solicd-liquid phase separation was formed in the demixing process and the porosity could be more than 70%. The research of demixing mechanism and membrane-formation process showed that the membrane was stacked through porous lamella. The porosity of membrane increases and the pore diameter decreases with increasing solidtfying temperature. Both the porosity and pore diameter decrease with the chitosan concentration increase.

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Authors and Affiliations

  1. Insfirlrle of Macromolecular Science, Fudan University, 200433, Shanghai, China

    Wenjun Li, Zhenyu Gu, Wei Zhong & Peihua Xue

Authors
  1. Wenjun Li
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  2. Zhenyu Gu
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  3. Wei Zhong
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  4. Peihua Xue
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Cite this article

Li, W., Gu, Z., Zhong, W. et al. Cryogenic induced phase separation of chitosan solution. Chin. Sci. Bull. 44, 1887–1891 (1999). https://doi.org/10.1007/BF02886347

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  • DOI: https://doi.org/10.1007/BF02886347

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