Synthesis Of Heat/salt Thickening Star Polymers By SET-LRP Method And Study On Its Properties

The structure of the star polymer is close to that of the linear polymer,the polymer structure is close and the shape of the polymer is relatively symmetrical.The solution has a low viscosity,but the retention rate in the salt solution is high,Hydrodynamic small size [43].In the functional group stability and concentration,melt viscosity performance is better,the temperature and salt resistance than the linear structure of the polymer is better,and the molecular weight distribution is narrow,this paper uses single electron transfer activity(Single Electron Transfer Living Radical Polymerization,SET-LRP),the acrylamide star-shaped water-soluble polymer was synthesized by "first nuclear method".The specific contents are as follows:Determination of sodium p-styrene sulfonate with water as solvent(SSS)was used as the solvent to form anionic monomer in polyacrylamide.Using carbon tetrachloride(CCl4)as the initiator,a single catalyst was used in Cu0/Me6-TREN catalytic system.Electron transfer active radical polymerization(SET-LRP),combined with infrared spectroscopy(FT-IR),1H-NMR spectroscopy to determine the activity of the polymerization reaction,in line with the target structure is expected.The molecular weight and molecular weight distribution of the polymer were investigated by single factor variable method.The optimum reaction conditions were summarized.The results showed that the reaction time increased with the increase of the reaction time,ln([M]0/[M])=1.528 min-1,the molecular weight distribution is controllable and the value is lower than 1.20.The molecular weight distribution of the polymer is 1.76 million,kpapp=0.028 min-1.Synthesis of cationic monomer methacryloyloxyethyldimethyl dodecylammonium bromide(DMDB)with dimethylaminoethyl methacrylate(DMAEMA)and bromododecane as raw materials.In the presence of carbon tetrachloride(CCl4)as the initiator in Cu0/Me6-TREN catalytic system,methyl methacryloyloxyethyldimethyl dodecylammonium bromide(DMDB).And acrylamide(AM),to obtain star acrylamide / methacryloyloxyethyldimethyl dodecylammonium bromide binary copolymer(SET-LRP)(FT-IR)and 1H-NMR(NMR)spectroscopy were used to determine the activity characteristics of the polymerization reaction,which is consistent with the target structure.The molecular weight and molecular weight distribution of the polymer were investigated by single factor variable method.The optimum reaction conditions were summarized.The results showed that the reaction time increased with the increase of the reaction time,ln([M]0/[M])The molecular weight of the polymer was 1.05 million,kpapp = 0.023 min-1,and the polydispersity index Mw / Mnis1.223.1-Bromododecane(DMDB)and N,N-dimethylacrylamide(DMAA)were used to improve the concentration of poly(meth)(AM-DMAA-DMDB)was synthesized by the preparation of the monomer-loaded SET-LRP in aqueous solution by using the functional monomer of acrylamide hot/salt thickening.(1H-NMR)was used to characterize the polymerization activity,which was in accordance with the target structure.The molecular weight and molecular weight distribution of the polymer were investigated by single factor variable method.The optimum reaction conditions weresummarized and the reaction time was increased.ln([M]0/[M])The molecular weight of the polymer was 1.3 million,kpapp = 0.025 min-1,and the polydispersity index Mw/Mn was 1.239.