Matsuyama Hideto

Effects of F127 on Properties of PVB/F127 Blend Hollow Fiber Membrane via Thermally Induced Phase Separation

Abstract Hydrophilic poly(vinyl butyral) (PVB)/Pluronic F127 (F127) blend hollow fiber membranes were prepared via thermally induced phase separation (TIPS), and the effects of blend composition on the performance of hydrophilic PVB/F127 blend hollow fiber membrane were investigated. The addition of F127 to PVB/polyethylene glycol (PEG) system decreases the cloud point temperature, while the cloud point temperature increases slightly with the addition of F127 to 20% (by mass) PVB/F127/PEG200 system when the concentration of F127 is not higher than 5% (by mass). Light scattering results show that the initial inter-phase periodic distance formed from the phase separation of 20% (by mass) PVB/F127/PEG200 system decreases with the addition of F127, so does the growth rate during cooling process. The blend hollow fiber membrane prepared at air-gap 5mm, of which the water permeability increases and the rejection changes little with the increase of F127 concentration. For the membrane prepared at zero air-gap, both water permeability and rejection of the PVB/F127 blend membrane are greater than those of PVB membrane, while the tensile strength changes little. Elementary analysis shows that most F127 in the polymer solution can firmly exist in the polymer matrix, increasing the hydrophilicity of the blend membrane prepared at air-gap of 5mm.

The effect of chemical structures of cyclic amino acid type ionic liquids as CO2 carriers on facilitated transport membrane performances

ABSTRACTFour kinds of amino acid ionic liquids (AAILs) with different cyclic amino acids were synthesized and used as CO2 carriers of facilitated transport membranes (FTMs) to investigate the effect of their chemical structure on the CO2 permeability. The cyclic AAILs showed low viscosities after CO2 absorption. The CO2 permeability of the FTM containing the cyclic AAIL with greater electron density showed better CO2 permeability owing to the higher CO2 absorbability and low viscosity. Because the viscosities of the investigated AAILs were relatively low, the dominating factor of the CO2 permeation resulted from the electron density of the amino group.ABSTRACT Four kinds of amino acid ionic liquids (AAILs) with different cyclic amino acids were synthesized and used as CO2 carriers of facilitated transport membranes (FTMs) to investigate the effect of their chemical structure on the CO2 permeability. The cyclic AAILs showed low viscosities after CO2 absorption. The CO2 permeability of the FTM containing the cyclic AAIL with greater electron density showed better CO2 permeability owing to the higher CO2 absorbability and low viscosity. Because the viscosities of the investigated AAILs were relatively low, the dominating factor of the CO2 permeation resulted from the electron density of the amino group.