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Supra-polymer acrylic amide copolymer prepared through free radical polymerization

A technology of free radicals and polymers, applied in the field of preparing ultra-high molecular weight acrylamide copolymers by free radical polymerization, can solve problems such as unfavorable multi-branched polymers

Inactive Publication Date: 2018-10-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Otherwise, the chain initiation by free DMAEMA will always form a low molecular weight linear polymer, which is not conducive to the final high molecular weight multi-branched polymer

Method used

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  • Supra-polymer acrylic amide copolymer prepared through free radical polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare an aqueous solution with a total volume of 250mL, wherein the initial concentration of AAm (denoted as [AAm] 0 ) is 3.85mol L -1 , the initial concentration of DMAEMA (denoted as [DMAEMA] 0 ) is 4.50×10 -2 mol L -1 , the initial concentration of NaPS (denoted as [NaPS] 0 )6.20×10 -4 mol L -1 、CuSO 4 ·5H 2 The initial concentration of O (denoted as [CuSO 4 ] 0 ) is 1.40×10 -4 mol L -1 , The initial concentration of tris (2-N, N-dimethylaminoethyl) amine (denoted as [Me 6 TREN] 0 ) is 2.80×10 -4 mol L -1 , the initial concentration of NaBr (denoted as [NaBr] 0 )1.40×10 -2 mol L -1 . After reacting at room temperature for 2h, react at 40°C for 1h. The obtained PAAm was precipitated and separated, and the obtained PAAm was determined to be 4.28×10 by viscosity method. 6 .

Embodiment 2

[0018] Prepare an aqueous solution with a total volume of 250mL, wherein the initial concentration of AAm (denoted as [AAm] 0 ) is 3.85mol L -1 , the initial concentration of DMAEMA (denoted as [DMAEMA] 0 ) is 4.50×10 -2 mol L -1 , the initial concentration of NaPS (denoted as [NaPS] 0 )6.20×10 -4 mol L -1 、CuSO 4 ·5H 2 The initial concentration of O (denoted as [CuSO 4 ] 0 ) is 1.40×10 -4 mol L -1 , The initial concentration of tris (2-N, N-dimethylaminoethyl) amine (denoted as [Me 6 TREN] 0 ) is 2.80×10 -4 mol L -1 , the initial concentration of NaBr (denoted as [NaBr] 0 )1.40×10 -2 mol L -1 . After reacting at room temperature for 2h, react at 40°C for 2h. The obtained PAAm was precipitated and separated, and the obtained PAAm was determined to be 5.24×10 by viscosity method. 6 .

Embodiment 3

[0020] Prepare an aqueous solution with a total volume of 250mL, wherein the initial concentration of AAm (denoted as [AAm] 0 ) is 3.85mol L -1 , the initial concentration of DMAEMA (denoted as [DMAEMA] 0 ) is 4.50×10 -2 mol L -1 , the initial concentration of NaPS (denoted as [NaPS] 0 )6.20×10 -4 mol L -1 、CuSO 4 ·5H 2 The initial concentration of O (denoted as [CuSO 4 ] 0 ) is 1.40×10 -4 mol L -1 , The initial concentration of tris (2-N, N-dimethylaminoethyl) amine (denoted as [Me 6 TREN] 0 ) is 2.80×10 -4 mol L -1 , the initial concentration of NaBr (denoted as [NaBr] 0 )1.40×10 -2 mol L -1 . After reacting at room temperature for 2h, react at 40°C for 2h, then react at 50°C for 1h. The obtained PAAm was precipitated and separated, and the obtained PAAm was determined to be 5.84 × 10 by viscosity method. 6 .

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Abstract

The invention relates to high-molecular weight polyacrylamide (PAAm) obtained through free radical polymerization. By adjusting the concentration of persulfate, methacrylic acid 2-(N,N-dimethylamino)ethyl ester (marked as DMAEMA) and sodium bromide (NaBr), the structure and concentration of a catalyst and reaction temperature, the high-molecular weight polymer is obtained and crosslinking is avoided by a high polymerization rate. A preparation method includes the following steps that with the persulfate and the DMAEMA, a polymerizable redox system is constructed, free radical polymerization of acrylic amide (AAm) is initiated in a water solution containing a certain amount of high oxidation state transition metal salt complex (copper or iron) and NaBr, reaction is performed for 60 min orlonger at the temperature of 40 DEG C or higher, and then the long-chain branching high-molecular weight PAAm with viscosity average molecular weight exceeding 106. In preparation, raw materials are common, conditions are mild, and all the raw materials for usage are sold in the market, and are cheap and easy to obtain; operation is simple, environmental pollution is small, and broad industrialized application prospects are achieved.

Description

technical field [0001] The invention belongs to the field of preparing high-molecular-weight polymers, and relates to the aqueous radical copolymerization of acrylamide (referred to as AAm), in particular to persulfate-methacrylic acid 2-(N,N-dimethylamino)ethyl ester ( It is denoted as DMAEMA) to form a polymerizable redox system to induce free radicals of AAm in an aqueous solution containing a certain amount of high oxidation state transition metal salt complexes (such as copper or iron salts) and halide ions (such as chloride ions or bromide ions). polymerized to form long chain branched high molecular weight AAm copolymers. Background technique [0002] Acrylamide (AAm) is one of the common water-soluble nonionic unsaturated monomers. Polyacrylamide (PAAm) formed by free radical polymerization has a wide variety and various structures, and is widely used in the water treatment industry. The free radical polymerization of AAm can easily obtain the average relative molec...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34
CPCC08F220/56C08F220/34
Inventor 陈琪余天亮周永生翟光群
Owner CHANGZHOU UNIV
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