UHMW (Ultra-high Molecular Weight) PDMAAm (Poly N,N-Dimethyl Acrylamide) prepared through polymerization of free radicals
A technology of dimethylacrylamide and high molecular weight, which is applied in the field of preparing ultra-high molecular weight poly-N,N-dimethylacrylamide by free radical polymerization, which can solve the problems such as difficulty in catalyst removal, and achieve low requirements for reaction conditions , little environmental pollution and easy operation
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Embodiment 1
[0020] Configure an aqueous solution with a total volume of 250mL, wherein the initial concentration of DMAAm (denoted as [DMAAm] 0 ) is 4.375molL -1 , the initial concentration of DMAEMA (denoted as [DMAEMA] 0 ) is 0.295mol L -1 , the initial concentration of NaPS (denoted as [NaPS] 0 ) is 8.0×10 -4 mol L -1 , Fe(NO 3 ) 3 The initial concentration (denoted as [Fe(NO 3 ) 3 ] 0 ) is 10 -5 mol L -1 , the initial concentration of disodium ethylenediaminetetraacetic acid (denoted as [EDTA] 0 ) is 2×10 -5 mol L -1 , the initial concentration of NaCl (denoted as [NaCl] 0 )1.0×10 - 2 mol L -1 . Reacted at 40°C for 4h, then at 60°C for 2h, then at 70°C for 1h, then at 90°C for 2h. The obtained PDMAAm was precipitated and separated, and the obtained PDMAAm was determined to be 6.87×10 by viscosity method. 5 .
Embodiment 2
[0022] Prepare an aqueous solution with a total volume of 250mL, where [DMAAm] 0 4.375mol L -1 、[DMAEMA] 0 0.295mol L -1 、[NaPS] 0 8.0×10 -4 mol L -1 , [Fe(NO 3 ) 3 ] 0 for 10 -5 mol L -1 、[EDTA] 0 2×10 -5 moL -1 , [NaCl] 0 1.0×10 -2 mol L -1 . Reacted at 40°C for 4h, then at 60°C for 2h, then at 70°C for 1h, then at 90°C for 2h, then at 100°C for 2h. The obtained PDMAAm was precipitated and separated, and the obtained PDMAAm was determined to be 6.61×10 by viscosity method. 6 .
Embodiment 3
[0024] Prepare an aqueous solution with a total volume of 250mL, where [DMAAm] 0 4.375mol L -1 、[DMAEMA] 0 0.295mol L -1 、[NaPS] 0 8.0×10 -4 mol L -1 , [Fe(NO 3 ) 3 ] 0 for 10 -5 mol L -1 、[EDTA] 0 2×10 -5 moL -1 , [NaCl] 0 1.0×10 -2 mol L -1 . Reacted at 40°C for 4h, then at 60°C for 2h, then at 70°C for 1h, then at 90°C for 2h, then at 100°C for 4h. The obtained PDMAAm was precipitated and separated, and the obtained PDMAAm was determined to be 8.97×10 by viscosity method. 6 .
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