Polyvinylidene fluoride hollow fiber membrane modified by blending amphiphilic triblock copolymer
A polyvinylidene fluoride, blending modification technology, applied in membrane, membrane technology, semi-permeable membrane separation and other directions, to achieve the effect of good hydrophilicity and anti-protein pollution ability
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Embodiment 1
[0045]A method for preparing a polyvinylidene fluoride hollow fiber membrane modified by amphiphilic triblock copolymer blending, the steps of the method are as follows:
[0046] (1) Add 10 parts of hydroxyethyl methacrylate, 0.2 parts of trithioester and 0.01 part of azobisisobutyronitrile to 90 parts of N,N'-dimethylformamide, stir at room temperature to fully Dissolve, then stir and raise the temperature to 65°C under a nitrogen atmosphere, and keep the temperature for 6 hours. The reaction solution is precipitated with ether, filtered, and the obtained solid is vacuum-dried to obtain a yellowish translucent solid a with a yield of 85%;
[0047] (2) Add 5 parts of solid a, 3 parts of styrene and 0.01 part of azobisisobutyronitrile into 92 parts of dimethylformamide, stir at room temperature to fully dissolve, and then stir and heat up to 65°C, and keep it warm for 15 hours, the reaction solution is precipitated with ether, filtered, and the obtained solid is vacuum-dried at...
Embodiment 2
[0056] A method for preparing a polyvinylidene fluoride hollow fiber membrane modified by amphiphilic triblock copolymer blending, the steps of the method are as follows:
[0057] (1) Add 20 parts of hydroxyethyl methacrylate, 1 part of trithioester and 0.1 part of azobisisobutyronitrile to 79 parts of N,N'-dimethylformamide, stir at room temperature to fully Dissolve, then stir and raise the temperature to 85°C under a nitrogen atmosphere, and keep the temperature for 8 hours. The reaction solution is precipitated with ether, filtered, and the obtained solid is vacuum-dried to obtain a yellowish translucent solid a with a yield of 75%;
[0058] (2) Add 20 parts of solid a, 20 parts of methyl methacrylate and 0.1 part of azobisisoheptanonitrile to 60 parts of dimethylformamide, stir at room temperature to fully dissolve, and then under nitrogen atmosphere, Stir and heat up to 85°C, and keep it warm for 24 hours. The reaction liquid is precipitated with ether, filtered, and the...
Embodiment 3
[0067] A method for preparing a polyvinylidene fluoride hollow fiber membrane modified by amphiphilic triblock copolymer blending, the steps of the method are as follows:
[0068] (1) Add 12 parts of hydroxyethyl methacrylate, 0.3 parts of trithioester and 0.02 parts of azobisisobutyronitrile to 88 parts of N,N'-dimethylformamide, stir at room temperature to fully Dissolve, then stir and raise the temperature to 75°C under a nitrogen atmosphere, and keep the temperature for 6 hours. The reaction solution is precipitated with ether, filtered, and the obtained solid is vacuum-dried to obtain a yellowish translucent solid a with a yield of 80%;
[0069] (2) Add 11 parts of solid a, 6 parts of acrylonitrile and 0.02 part of azobisisobutyronitrile to 83 parts of N-methylpyrrolidone, stir at room temperature to fully dissolve, then stir and heat up to 70°C, keep warm for 20 hours, precipitate the reaction liquid with ether, filter, and dry the obtained solid at 60°C in vacuum for 48...
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Abstract
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