Polymerization Of Butyl Methacrylate's Activators Generated By Electron Transfer ATRP In Miniemulsion

Atom radical transfer polymerization (ATRP) was a technology of "living"/controlled radical polymerization (CRP), using halogenated hydrocarbon as initiators and transition metal complex compounds as activators, which was widely used in syntheses of special structure polymer with the virtue of wide monomer selection bound, gentle reaction condition and well control of polymerization. Miniemulsion polymerization was a secure and efficient polymerization method with droplets nucleation, and was very suitable for application of CRP. Researching ATRP in miniemulsion had a very important sense.ATRP using Activators generated by electron transfer (AGET) process was a new progress which was reported in recent years, attracted academic interests because of its anti-oxidation capability. In this dissertation, AGET ATRP was carried out in miniemulsion, using butyl methacrylate (BMA) as monomer, ethyl 2-bromoisobutyrate (EBiB) as initiator, ascorbic acid (AA) as reducing agent, CuBr2/4,4'-bis(nonyl)-2,2'-bipyridine (dNbpy) as activator, P.O.E.(20) oleyl alcohol (Brij 98) as surfactant and hexadecane (HD) as costabilizer.Effect of polymerization control performance was studied by changing the amounts of reducing agent, activators and surfactant/costabilizer, the control of polymerization became worse when the amounts of reducing agent and activator were increased and amounts of surfactant/costabilizer were decreased. The best polymerization condition was found, when n(M):n(EBiB): n(Cu):n(dNbpy): n(AA)=200:1:0.4:0.8:0.16, amount of surfactant/costabilizer was 5wt%(vs mass of monomer), well control and living polymerization character was obtained as:high monomer conversion reached 99%, linear kinetic plot, molecular weight of polymer followed the theoretical expectation and low polydispersity (PDI<1.18). Polymerization with a limited amount air was also carried out in miniemulsion and show well control performance. Calculating equation of radical concentration in AGET ATRP system was deducted in this dissertation based on the deactivate-activate balance in ATRP and previously experiment research. Using the calculation equation, the relationship between racial concentration in AGET ATRP system and the reactant prescription was studied. Rationality of the deduction was proved and results of the experiments were explained. Some suggestion and forecast was given base on deduction and calculated results for further experiments design and research.