Method for preparing polymeric blend membrane by nonsolvent induced gel phase separation method
A gel phase separation method and polymer technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as difficult to achieve high performance and anti-pollution performance, and achieve excellent separation performance and mechanical properties , Excellent permanent hydrophilicity, high-purity water flux effect
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Embodiment 1
[0021] The method for preparing the polymer blend membrane by the non-solvent-induced gel phase separation method is as follows: Weigh 7.56g polyethersulfone, 1.44g sulfonated polysulfone, 12g polyethylene glycol (molecular weight 1kDa), dissolve in 41g DMAc , and then 4.5 g of non-solvent water was added thereto, and then mechanically stirred for 8 hours under the condition of 70° C. water bath to obtain a homogeneous solution, and left to defoam under the condition of 70° C. water bath. Then scrape the casting solution on a clean glass plate, lower it to room temperature, and then immerse it in the coagulation bath-water to solidify to form a film. The results show that the cross-section of the obtained blend membrane is an asymmetric gradient open-pore sponge structure, and its pure water flux is 1158L / m 2 h, the rejection rate of bovine serum albumin (BSA) is 95.5%, and the breaking strength reaches 3.5MPa.
Embodiment 2
[0023] The method for preparing the polymer blend membrane by the non-solvent-induced gel phase separation method is as follows: Weigh 8.4g polyethersulfone, 1.6g sulfonated polyethersulfone, 10g polyethylene glycol (molecular weight 30kDa), dissolve in 40g DMAc 4 g of non-solvent ethanol (95v / v%) was added thereto, then mechanically stirred under 70°C water bath conditions for 8 hours, and after obtaining a homogeneous solution, stand for defoaming under 70°C water bath conditions. Then scrape the casting solution on a clean glass plate, after cooling down to room temperature, then immerse it in the coagulation bath-water to solidify to form a film. The results show that the cross-section of the blend membrane obtained under this condition is an asymmetric gradient open-pore sponge structure, and its pure water flux is 820L / m 2 h, the rejection rate of BSA is 98.7%, and the mechanical strength reaches 4.2MPa.
Embodiment 3
[0025] The method for preparing polymer blend membrane by non-solvent-induced gel phase separation method is as follows: Weigh 10.08g polysulfone, 1.92g sulfonated polyether ether ketone, 6.0g PVP (molecular weight 30kDa), dissolve in 38g DMAc, Then, 2.0 g of non-solvent methanol was added thereto, and then mechanically stirred for 8 hours under the condition of 70° C. water bath to obtain a homogeneous solution, and left to defoam under the condition of 70° C. water bath. Then scrape the casting solution on a clean glass plate, after it is lowered to room temperature, then immerse it in the coagulation bath-water to solidify to form a film. The results show that the section of the blend membrane obtained under this condition is an asymmetric gradient open-pore sponge structure, and its pure water flux is 958L / m 2 h, the rejection rate of BSA is 97.8%, and the mechanical strength reaches 4.6MPa.
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