A method for preparing a temperature-sensitive separation membrane with nano-ordered pores
A technology of sensitive membrane and pore size, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of insignificant response performance of temperature-sensitive membrane, achieve simple and efficient pore-forming process, synergistic response process, and responsive The effect of increased speed
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Embodiment 1
[0023] (1) Block copolymer PS-b-PNIPAAm was synthesized in two steps by atom transfer radical method. Specifically: 0.1g CuBr, 0.27g α, α'-bipyridine (BPY) and 0.1g initiator 2-ethyl bromopropionate were placed at the bottom of the reaction flask, then 15ml styrene and 3ml toluene were added, and liquid nitrogen was frozen for 10 Minutes, vacuumize, fill with nitrogen, and thaw at room temperature, repeat 2-3 times like this. React at 110°C for 24h. After the reaction was completed, it was rapidly cooled to 0°C. Dissolve with an appropriate amount of dichloromethane, remove CuBr by suction filtration, pass through a neutral alumina column, and then wash with ethanol precipitation, and dissolve the precipitate three times repeatedly. The product was dried under vacuum at 40 °C for 12 h.
[0024] Add 0.125g CuBr, 3g macromolecular initiator PS-Br, 0.25ml Me 6 TREN, 3g NIPAAm and 6ml solvent DMF were frozen in liquid nitrogen for 10 minutes, vacuumized, filled with nitrogen, ...
Embodiment 2
[0028] (1) Block copolymer PS-b-PNIPAAm was synthesized in two steps by atom transfer radical method. Specifically: 0.1g CuBr, 0.27g α, α'-bipyridine (BPY) and 0.1g initiator 2-ethyl bromopropionate were placed at the bottom of the reaction flask, then 15ml styrene and 3ml toluene were added, and liquid nitrogen was frozen for 10 Minutes, vacuumize, fill with nitrogen, and thaw at room temperature, repeat 2-3 times like this. React at 130°C for 24h. After the reaction was completed, it was rapidly cooled to 0°C. Dissolve with an appropriate amount of dichloromethane, remove CuBr by suction filtration, pass through a neutral alumina column, and then wash with ethanol precipitation, and dissolve the precipitate three times repeatedly. The product was dried under vacuum at 40 °C for 12 h.
[0029] Add 0.125g CuBr, 3g macromolecular initiator PS-Br, 0.25ml Me 6 TREN, 3g NIPAAm and 6ml solvent DMF were frozen in liquid nitrogen for 10 minutes, vacuumized, filled with nitrogen, ...
Embodiment 3
[0033] (1) Block copolymer PS-b-PNIPAAm was synthesized in two steps by atom transfer radical method. Specifically: 0.1g CuBr, 0.27g α, α'-bipyridine (BPY) and 0.1g initiator 2-ethyl bromopropionate were placed at the bottom of the reaction flask, then 15ml styrene and 3ml toluene were added, and liquid nitrogen was frozen for 10 Minutes, vacuumize, fill with nitrogen, and thaw at room temperature, repeat 2-3 times like this. React at 1I0°C for 48h. After the reaction was completed, it was rapidly cooled to 0°C. Dissolve with an appropriate amount of dichloromethane, remove CuBr by suction filtration, pass through a neutral alumina column, and then wash with ethanol precipitation, and dissolve the precipitate three times repeatedly. The product was dried under vacuum at 50 °C for 12 h.
[0034] Add 0.125g CuBr, 3g macromolecular initiator PS-Br, 0.25ml Me 6 TREN, 3g NIPAAm and 6ml solvent DMF were frozen in liquid nitrogen for 10 minutes, vacuumized, filled with nitrogen, ...
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