Method for preparing amphiphilic block copolymer modified polyvinylidene fluoride hollow fiber membrane
A polyvinylidene fluoride and copolymer modification technology, applied in the field of material science, can solve problems such as adsorption, and achieve the effects of high filtration accuracy, improved hydrophilic properties, and high strength
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Embodiment 1
[0042] (1) Preparation of polyvinylpyrrolidone homopolymer:
[0043] Dissolve 2 parts of N-vinylpyrrolidone in 98 parts of 1,4-dioxane to make a 2% N-vinylpyrrolidone solution, and add 0.2 parts of S, S'-bis(α,α' -Methyl-α"acetic acid) trithiocarbonate, with 0.1 part of AIBN in N 2 Under protection, react at 60° C. for 4 hours to obtain a PVP homopolymer with a chain transfer agent terminal carboxyl group.
[0044] (2) Modification of polyvinylpyrrolidone homopolymer:
[0045] Dissolve 1 part of PVP homopolymer in 19 parts of dichloromethane to make a solution with a concentration of 5%, then add 2 parts of DCC and 8 parts of HOBT (based on PVP), then add 10 parts of Allylamine (based on PVP) was reacted at 0°C for 72 hours, and modified PVP was obtained after separation and treatment on a silica gel column.
[0046] (3) Modified PVP and organosiloxane polymer to generate block copolymer:
[0047] Dissolve 4 parts of modified PVP and 6 parts of vinyl polydimethylsiloxane i...
Embodiment 2
[0049] (1) Preparation of polyvinylpyrrolidone homopolymer:
[0050] Dissolve 100 parts of N-vinylpyrrolidone in 900 parts of 1,4-dioxane to make a 10% N-vinylpyrrolidone solution, and put 10 parts of S, S'-bis(α,α' -Methyl-α"acetic acid) trithiocarbonate, with 0.5 parts AIBN in N 2 Under protection, react at 80°C for 72 hours to obtain a PVP homopolymer with a chain transfer agent terminal carboxyl group.
[0051] (2) Modification of polyvinylpyrrolidone homopolymer:
[0052] Dissolve 1 part of PVP homopolymer in 1 part of dichloromethane to make a solution with a concentration of 50%, then add 8 parts of DCC and 4 parts of HOBT (based on PVP), and then add 50 parts of Allylamine (based on PVP) was reacted at 80° C. for 1 hour, and modified PVP was obtained after separation and treatment by silica gel column.
[0053] (3) Modified PVP and organosiloxane polymer to generate block copolymer:
[0054] Dissolve 3 parts of modified PVP and 7 parts of vinyl polydimethylsiloxane...
Embodiment 3
[0056] (1) Preparation of polyvinylpyrrolidone homopolymer:
[0057] Dissolve 30 parts of N-vinylpyrrolidone in 20 parts of 1,4-dioxane to make a 60% N-vinylpyrrolidone solution, and add 0.3 parts of S, S'-bis(α,α' -Methyl-α"acetic acid) trithiocarbonate, with 4.5 parts AIBN in N 2 Under protection, react at 60° C. for 72 hours to obtain a PVP homopolymer with a chain transfer agent terminal carboxyl group.
[0058] (2) Modification of polyvinylpyrrolidone homopolymer:
[0059] Dissolve 1 part of PVP homopolymer in 4 parts of dichloromethane to make a solution with a concentration of 20%, then add 4 parts of DCC and 4 parts of HOBT (based on PVP), and then add 40 parts of Styrylamine (based on PVP) was reacted at 25°C for 24 hours, and modified PVP was obtained after separation and treatment by silica gel column.
[0060] (3) Modified PVP and organosiloxane polymer to generate block copolymer:
[0061] Dissolve 6 parts of modified PVP and 4 parts of styrene-based polydimet...
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