Preparation method for amphipathic triblock copolymer modified polyvinylidene fluoride membrane
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A polyvinylidene fluoride membrane and copolymer modification technology, which is applied in the field of material science, can solve the problems of low rejection rate, etc., and achieve the effect of improved hydrophilicity, easy operation and simple operation
Inactive Publication Date: 2017-12-19
TIANJIN POLYTECHNIC UNIV
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[0008] The purpose of the present invention is to utilize a kind of simple, controllable polymerization method to prepare a kind of amphiphilic block copolymer to be used for modifying PVDF film, make it have the advantages such as hydrophilicity, antifouling property and stable performance, by modifying To overcome the problems of the reduction of rejection rate and flux attenuation caused by membrane fouling
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Embodiment 1
[0031] (1) Preparation of PDMD
[0032] First prepare PMMA-CTA: add 15g MMA, 0.761g RAFT reagent (CTA), 0.12g initiator A, 70mL solvent B into a 200mL reaction tube, put it in an ice-water bath and vacuumize for 30min, and remove the air in the reaction tube. Freeze the solvent with liquid nitrogen, use a double-row tube to evacuate and pass argon three times, and react in an oil bath at 70°C for 24 hours. The resulting substance was precipitated with 500 mL of n-hexane, filtered with suction, and the solid was collected and dried in vacuum to obtain yellow PMMA-CTA.
[0033]Then add 5g DMAEMA, 5g PMMA-CTA, 41mg AIBN, 40mL toluene into the 100mL reaction tube, put it into an ice-water bath and vacuumize for 30min, and remove the air in the reaction tube. Freeze the solvent with liquid nitrogen, use a double-row tube to evacuate and fill with argon three times, and react in an oil bath at 70°C for 24 hours. The obtained substance was precipitated with 500 mL of ice n-hexane, ...
Embodiment 2
[0041] (1) Preparation of PMDM:
[0042] First, add 10g of refined DMAEMA, 0.5075g of RAFT reagent (CTA), 82mg of initiator AIBN, and 70mL of toluene into a 200mL reaction tube, put it in an ice-water bath and vacuumize for 30min, and remove the air in the reaction tube. Freeze the solvent with liquid nitrogen, use a double-row tube to evacuate and pass argon three times, and react in an oil bath at 60°C for 24 hours. Part of the solvent was removed by rotary evaporation, and precipitated with 500 mL of n-hexane, filtered with suction, and the solid was collected and vacuum-dried at 40°C to obtain PDMAEMA-CTA as a light yellow solid. Then add 7.9g PDMAEMA-CTA, 7.9g MMA, 64.8mg AIBN, and 40mL toluene into a 100mL reaction tube, put it in an ice-water bath and vacuumize for 30min, and remove the air in the reaction tube. Freeze the solvent with liquid nitrogen, use a double-row tube to evacuate and fill with argon three times, and react in an oil bath at 60°C for 24 hours. Par...
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Abstract
The invention provides a preparation method for an amphipathic triblock copolymer modified polyvinylidene fluoride membrane. According to the preparation method, methyl methacrylate (MMA) and methacrylic acid-N,N-dimethylamino ethyl ester (DMAEMA) are utilized as a polymerization monomer, two amphipathic segmented copolymers of ABA type (PDMAEMA-b-PMMA-b-PDMAEMA, PDMD) and BAB type (PMMA-b-PDMAEMA-b-PMMA, PMDM) can be prepared by two-step reversible addition-fragmentation chain transfer (RAFT) free radical polymerization, the two amphipathic segmented copolymers have different topological structures, and the structures are controllable, the two amphipathic segmented copolymers are utilized as blending modifiers to prepare the amphipathic triblock copolymer modified polyvinylidene fluoride membrane by an inversion method of immersion precipitation phase. PMMA chain sections in the modifiers prepared by the preparation method disclosed by the invention have good compatibility with PVDF, so that the modifiers have good stability in the membrane and are not prone to losing; the PDMAEMA chain sections are enriched on the surface to improve hydrophilia of the membrane. Compared with a pure membrane, surface hydrophilicity and water flux of the amphipathic triblock copolymer modified polyvinylidene fluoride (PVDF) membrane prepared by the preparation method disclosed by the invention are obviously improved.
Description
technical field [0001] The invention relates to a preparation method of an amphiphilic triblock copolymer modified polyvinylidene fluoride membrane, belonging to the field of material science. Background technique [0002] Compared with other separation technologies, membrane separation technology has many advantages: good separation effect, low pollution, low energy consumption, continuous operation and so on. Nowadays, membrane separation technology is not limited to water purification, but has been widely used in chemical industry, petroleum, environmental protection engineering, food industry, biological engineering and other fields. [0003] Polyvinylidene fluoride (PVDF) is a semi-crystalline polymer. PVDF has many advantages: it has good tolerance to different environments and climates, and it is not easy to degrade under ultraviolet light; PVDF is soluble in extremely strong solutions. Medium, has good spinnability; good chemical stability, will not be corroded by a...
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