Abstract
In this study, a porous membrane consisting of lactic acid and cellulose acetate was fabricated using a low-cost and pro-environmental process. In order to solve the thermostability of the membrane, cellulose acetate, which has higher melting point than polypropylene (PP) and polyethylene (PE), was used as the polymer matrix. The wetting action of the lactic acid induced a plasticization effect in the cellulose acetate chain, forming several small pores during the hydrostatic treatment. The surface and cross-section of the membranes were observed using scanning electron microscope. The abundant pores were observed in the plasticized area on the surface. The interaction between cellulose acetate and lactic acid was investigated using Fourier transform infrared spectroscopy. In C=O and C–O peak, the peak shift was observed depending on whether or not the water pressure was treated, and the interaction of CA and lactic acid was confirmed. Furthermore, thermogravimetric analysis was performed to determine the thermal stability of the membrane and the removal of lactic acid by the hydrostatic treatment. As a result, thermal stability of CA polymer became weakened due to plasticization of lactic acid, but showed similar stability to neat CA after hydraulic treatment. In addition, the optimum composition and performance of the composite were investigated via water flux measurement. Furthermore, the average pore diameter and porosity of the cellulose acetate/lactic acid membrane measured using a porosimeter was 0.38 μm and 65.3%, respectively.
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Acknowledgments
This study was supported by the Basic Science Research Program (2020R1F1A1048176) through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT, and Future Planning. This research was also supported by 2021 Green Convergence Professional Manpower Training Program of the Korea Environmental Industry and Technology Institute funded by the Ministry of Environment.
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Kim, S.H., Kang, S.W. Preparation of highly stable cellulose separator by incorporation of lactic acid. Cellulose 28, 10055–10063 (2021). https://doi.org/10.1007/s10570-021-04144-7
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DOI: https://doi.org/10.1007/s10570-021-04144-7