Membrane Formation Mechanism for Water-Solvent-PVDF Systems and Membrane Structure for Ultrafiltration Application

Abstract:

Through immersion precipitation phase inversion, poly(vinyldiene fluoride) (PVDF) membranes applied in ultrafiltration were prepared. The influences of four solvents on the phase separation of PVDF casting solutions and membrane structure were discussed by mechanism of skin-sublayer two steps precipitation. The results showed that the delayed solid-liquid demixing occurred in the skin layer under the control of the thermodynamics of casting solutions, and the dense skin layer formed with spherical or dendritic crystals. The phase separation behaviors of the sublayers were controlled by the kinetic diffusion (DW-S/DS-W).

• Periodical: Advanced Materials Research (Volume 578)
• Pages: 129-132
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.578.129
• Online since: October 2012
• Authors: Dan Ying Zuo, Hong Jun Li
• Keywords: Kinetic, PVDF membrane, Skin-Sublayer Two Steps Precipitation, Thermodynamic, Ultrafiltration Application

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DOI: 10.1021/ma9508966