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Effect of different preparation methods on structure and properties of chitosan/poly-lactic acid blend porous membrane

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Abstract

Two kinds of blend solutions were used to prepare chitosan (CS)/poly-l-lactic acid (PLLA) blend membranes by the immersion precipitation phase inversion method. CS/PLLA blend membrane was fabricated by mixing CS-acetic acid solution and PLLA-dioxane solution, chitosan powder (CSP)/PLLA blend membrane was fabricated by mixing CSP and PLLA-dioxane solution. The membrane structure and properties were characterized by Scanning Electron Microscope, Wide Angle X-ray Diffraction, porosity, water vapor transmission rate and swelling property. The results showed that CS content in CSP/PLLA blend membrane was nearly 70 times higher than in CS/PLLA blend membrane. Two types of blend membranes took on an unsymmetrical structure with a skin layer, a microvoid sub-layer and a porous bottom surface. But CSP/PLLA blend membrane exhibited a porous skin layer, while the skin layer of CS/PLLA blend membrane was impact. The WAXD analysis revealed that PLLA and CS were amorphous in CS/PLLA blend membrane, while there were PLLA and CS crystalline in CSP/PLLA membrane, which resulted in the higher initial modulus of CSP/PLLA blend membrane. The porosity, WVTR and equilibrium swelling (Q eq ) of CSP/PLLA blend membrane were higher than that of CS/PLLA blend membrane, especially Q eq . The swelling kinetics results showed that in the initial swelling, water molecules diffusion followed Non-Fickian diffusion for CS/PLLA blend membrane swelling, and the swelling of CSP/PLLA blend membrane fitted with the relaxation diffusion model. The swelling kinetics studies for whole swelling revealed that the swelling degree and the initial swelling rate of CSP/PLLA membrane were significantly higher than that of CS/PLLA membrane, although the total swelling rate of CSP/PLLA blend membrane decreased lightly.

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Acknowledgments

The authors want to express their gratitude to the Research Projects of Textile Industry Association of China (2011025) and Research Projects of Wuhan Textile University (093866) for supporting this work.

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Authors and Affiliations

  1. Key Lab for Green Processing and Functional Textile of New Textile Materials (Ministry of Education), Department of Materials Science and Engineering, Wuhan Textile University, Hubei, 430073, People’s Republic of China

    Dan-Ying Zuo, Hong-Tao Liu & San-Ping Zhao

  2. Department of Industrial Engineering, Wuhan Textile University, Hubei, 430073, People’s Republic of China

    Hong-Jun Li

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  1. Dan-Ying Zuo
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  2. Hong-Jun Li
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Correspondence to Dan-Ying Zuo.

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Zuo, DY., Li, HJ., Liu, HT. et al. Effect of different preparation methods on structure and properties of chitosan/poly-lactic acid blend porous membrane. J Porous Mater 19, 1015–1022 (2012). https://doi.org/10.1007/s10934-012-9564-3

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  • DOI: https://doi.org/10.1007/s10934-012-9564-3

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