The Synthesis Of Acrylamide-based Polymers By Single Electron Transfer Living Radical Polymerization

We used a novel method to make polyacrylamide, which was Single Electron Transfer- Living Radical Polymerization(SET-LRP). Homopolymer and copolymer of AM were synthesized in aqueous solution, homopolymer of AM was synthesised in ionic liquids. We researched effects of the experiment on the polymerization, the details were as follows:1. It had demonstrated SET-LRP of AM initiated by 2-chloro-propionamide and catalyzed by Cu(0)/tris(2-aminomethyl)amine(Me6-TREN) in aqueous solution. We studied the effects of different reaction conditions on molecular weight by changing experimental conditions, such as the reaction time, monomer concentration, reaction temperature, the amount of ligand and initiator. On the base of single factor experiment, according to the principle of Central Composite Design(CCD), we used Response Surface Methodology(RSM) of three factors and three levels to preliminarily explore the best technology condition for polymerization. The results were: the amount of initiator was 1.0mmol, the monomer concentration was 26% and the reaction time was 40min.2. We used three-aminoethyl amine and diethylenetriamine as raw materials respectively to synthesis two ultidentate ligands: Me6-TREN and pentamethy1-diehtyltriamine, which were combinated with Cu(0) and used as ctalytic systems for the SET-LRP of AM in aqueous solution. The effects of the species of ligand, the amount of ligand and the reaction time on the polymerization were researched. The solution viscosity of the polymers was determined. The results showed that the Me6-TREN was the proper ligand.3. The copolymers of AM-2-(Dimethylamino)ethyl methacrylate(DM) and AM-methyl- acrylyl-ethyl-trimethyl-ammonium chloride(DMC) by SET-LRP in aqueous solution were synthesized, which catalyzed by Cu(0)/Me6-TREN and initiated by 2-chloro-propionamide. The effects of experimental conditions on the molecular weight and conversation of the copolymer were studied, such as the reaction temperature, the reaction time, the amount of monomer and molar ratio of two kinds of monomers. The process on the reaction conditions were explored.4. It had demonstrated SET-LRP of AM catalyzed by Cu(0)/Me6-TREN and initiated by 2-chloro-propionamide in ionic liquid. We changed the reaction time, monomer concentration, the amount of initiator and catalyst, in order to investigate the effects of different reaction conditions on polymer molecular weight.5. We studied the apparent viscosity properties of PAM aqueous solution which was catalyzed by Cu(0)/Me6-TREN and synthesised by SET-LRP in water. The concentration, temperature, shear rate, the amount of NaCl and CaCl2 were tested. The results showed that SET-LRP of PAM had a higher viscosity in aqueous solution.