Preparation and analysis of polypropylene/polysiloxane-silica hollow fiber membrane
To improve the hydrophobic performance of polypropylene(PP)microporous membranes for gas-liquid separation,the polysiloxane-silica and polypropylene resin were blended and made into hydrophobic polypropylene hollow fiber membranes by the melt-stretching method.DSC,TGA,SEM,AFM,porosity,water contact angle and gas/pure water fluxes were carried out to investigate the effect of polysiloxane-silica contents on the structure and performance of the hollow fiber membrane.The results showed that as the polysiloxane-silica content increased,the water contact angle of the membrane gradually increased,and the average pore size,pure water flux and gas flux indicated a trend of increasing and then decreasing.When the polysiloxane-silica content increased from 0 to 2%,the water contact angle of the membrane increased from 108.6° to 127.6°,indicating that the hydrophobicity of the PP microporous membrane was significantly improved.The membrane porosity was 59.4%,and the gas flux was 61.76L/(m2∙s),which was 2.16 times that of the pure PP membrane.Additionally,the polysiloxane-silica played the role of heterogeneous nucleation,improved the annealing effect,and made the structure of the main lamellae stable.The pore structure still consisted of separated lamellae crystals.
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