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Thermo-responsive mixed-matrix hollow fiber membranes

机译：热响应混合矩阵中空纤维膜

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摘要

Up to date, preparation of thermo-responsive mixed-matrix membranes (MMM) has only be described as small scale flat membranes or multi-step processes for hollow fiber membranes. In this work, the development of thermo-responsive MMM hollow fibers composed of polyethersulfone as membrane polymer and poly(N-isopropylacrylamide) (PNIPAM) microgel particles via the wet spinning process is presented. PNIPAM particles are synthesized with (NP-S, z(avg 20 degrees C) = 105 nm) and without (NP-L, z(avg 20 degrees C) = 250 nm) sodium dodecyl sulfate and their thermo-responsive behavior is characterized by dynamic light scattering. Particle size (NP-S, NP-L), particle content (10%, 15%) and the extrusion pressure in the wet spinning process (1.0-3.0 bar) are investigated as experimental parameters. Reversible thermo-responsive behavior of the hollow fibers is demonstrated by water permeability measurements at different temperatures (20 and 50 degrees C). The largest switching factors (R) are observed for the hollow fibers containing NP-L. For 15% NP-L and 1 bar extrusion pressure, water permeances between 0.5 and 6.0 L m(-2) h(-1) bar(-1) are observed, corresponding to R = 12 and a dextran (500 kDa) rejection of 91% at 25 degrees C.
机译：迄今为止，热响应混合基质膜（MMM）的制备仅被描述为小型平板膜或中空纤维膜的多步工艺。本文介绍了以聚醚砜为膜聚合物，以聚N-异丙基丙烯酰胺（PNIPAM）为微凝胶粒子，通过湿法纺丝工艺制备热响应MMM中空纤维的研究进展。PNIPAM颗粒由（NP-S，z（平均20摄氏度）=105 nm）和（NP-L，z（平均20摄氏度）=250 nm）十二烷基硫酸钠合成，其热响应行为通过动态光散射表征。以粒径（NP-S，NP-L）、颗粒含量（10%，15%）和湿法纺丝过程中的挤出压力（1.0-3.0 bar）为实验参数进行了研究。通过在不同温度（20和50摄氏度）下的透水性测量，证明了中空纤维的可逆热响应行为。对于含有NP-L的中空纤维，观察到最大的切换因子（R）。对于15%的NP-L和1巴的挤出压力，观察到0.5和6.0升m（-2）h（-1）巴（-1）之间的水渗透，对应于R=12，在25℃时右旋糖酐（500 kDa）的截留率为91%。

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