Method for preparing polyacrylamide by activecontrollable free radical polymerization
A technology for polyacrylamide and acrylamide monomers, which is applied in the field of preparing polyacrylamide by single electron transfer active radical polymerization, can solve the problems of high price of ligands, difficult to obtain raw materials, no industrial production of ligands, etc. The effect of less dosage, low production cost and good industrialization prospects
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Embodiment 1
[0025] A method for preparing polyacrylamide by living / controlled free radical polymerization, the raw materials of which are acrylamide monomer, copper wire, 2,2'-bipyridine (Bpy), tris(2-aminoethyl)amine (TREN), 2 -The initial molar concentration ratio of chloropropionamide is 100:0.2:0.25:0.25:0.05, and the specific preparation method is as follows:
[0026] 1) In the reactor, prepare 7.1g of acrylamide into an aqueous solution with a mass fraction of 40%, and fully stir until completely dissolved;
[0027] 2) Introduce nitrogen into the reactor for 15 minutes to exclude oxygen, add 0.013g copper wire, 0.039g 2,2'-bipyridyl, 0.037gTREN, 0.005g 2-chloropropanamide and 0.0005g Copper chloride, sealed reactor, polymerization reaction at room temperature for 30min;
[0028] 3) Take out the copper wire, add 4 times the volume of methanol to dilute the polymerization reaction solution under stirring, precipitate the polymerization product, centrifuge, dry in vacuum at 60°C to co...
Embodiment 2
[0030] A method for preparing polyacrylamide by living / controlled free radical polymerization, the initial molar concentration ratio of the raw materials acrylamide monomer, copper wire, pentamethyldiethylenetriamine (PMDETA) and 2-chloroacetamide is 400:0.5 : 2: 1.5, the specific preparation method is as follows:
[0031] 1) In the reactor, prepare 28.4g of acrylamide into an aqueous solution with a mass fraction of 26%, and stir until it is completely dissolved;
[0032] 2) Introduce nitrogen into the reactor for 15 minutes to exclude oxygen, add 0.032g copper wire, 0.346g PMDETA, 0.14g 2-chloroacetamide and 0.001g copper chloride to the reactor successively under stirring, seal the reactor, and keep it at room temperature Down polymerization reaction 35min;
[0033] 3) Take out the copper wire, add 4 times the volume of methanol to dilute the polymerization reaction solution under stirring, precipitate the polymerization product, centrifuge, dry in vacuum at 60°C to consta...
Embodiment 3
[0035] The method of preparing polyacrylamide by living / controlled free radical polymerization, its raw materials are acrylamide, iron wire, tris(2-aminoethyl)amine (TREN), hexamethylphosphoric triamide (HMPA), 2-chloropropane The initial molar concentration ratio of amides is 220:0.5:0.5:0.5:1, and the specific preparation method is as follows:
[0036] 1) In the reactor, prepare 15.62g of acrylamide into an aqueous solution with a mass fraction of 25%, and stir until it is completely dissolved;
[0037] 2) Feed nitrogen into the reactor for 15min to get rid of oxygen, add 0.028g iron wire, 0.073gTREN, 0.09g HMPA, 0.108g2-chloropropionamide and 0.001g ferric chloride to the reactor successively under stirring, seal the reactor, Polymerization at room temperature for 50 minutes;
[0038] 3) Take out the iron wire, add 4.5 times the volume of methanol to dilute the polymerization reaction solution under stirring, precipitate the polymerization product, centrifuge, dry in vacuu...
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