Morphology of microporous poly(vinylidene fluoride) membranes studied by gas permeation and scanning electron microscopy

Preparation of polyvinylidene fluoride hollow fiber membranes for CO2 absorption using phase-inversion promoter additives

“…It should be noted that the magnitude of the mean pore size determined by gas permeation does not have any significant physical meaning, especially for the membranes prepared by phase-inversion processes [26]. However, it has the same trend as pore size determined by atomic force microscopy (AFM) and solute transport test [27].…”

Preparation of Symmetric Network PVDF Membranes for Protein Adsorption via Vapor-Induced Phase Separation

“…Although the VIPS is a mature method, a slight change of various membrane formation parameters can significantly affect the membrane morphology, such as evaporation temperature, humidity, additives, solution composition, and evaporation time. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Buonomenna et al, [8] for instance, found that a high temperature of the casting solution was important to increase the rate of the liquid-liquid demixing on crystallization. Young et al [9] showed that the kinetic difference in the crystallization rate of the polymer solution was crucial in controlling the membrane structure by the dry-cast process.…”

CO 2 absorption using gas-liquid membrane contactors made of highly porous poly(vinyl chloride) hollow fiber membranes

“…9) together with estimated values of r p (Table 4), vividly confirm the prominent importance of adjusting take-up speed during HFM spinning in relation to produce HFMs with desired morphology. It is worthy to note that in literature (Shin et al, 1990) the estimated r p values calculated based on the gas permeation experiment are physically meaningless. Nevertheless, gas permeation results afford an insight into the comparative studies of HFM structures.…”