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Atom Transfer Radical Polymerization (ATRP) in a 2L emulsion batch reactor system was initiated by using the Activator Generated by Electron Transfer (AGET) technique to produce Poly (Methyl Methacrylate) (PMMA). The reactants were composed of Ethyl-2-bromoisobutyrate (EBiB) as the initiator, polyoxyethylene (20) oleyl ether (Brij98) as nonionic surfactant and ascorbic acid as the reducing agent. In addition, the catalyst complex consists of copper bromide (CuBr2) and different ligands such as Triphenylphosphine (PPh3), 1, 10-Phenanthroline (Phenol), and Vitamin D. The effect of using PPh3, Phenol and Vitamin D as novel ligands was investigated to produce PMMA polymers having the features obtained through controlled polymerization. The reaction follows a two-step experimental procedure, during which a transition from microemulsion to emulsion takes place. The mixing process between the organic phase and the aqueous phase was carried out under sufficient amount of air for simplification purposes. However, the reaction is usually sensitive to air and therefore a particular precaution was taken when purging the system inside the reactor. Gravimetric method was used to measure the monomer conversion. Characterization of PMMA samples was done by means of GPC to measure the molecular weight and the polydispersity of the product. FTIR analysis was performed to characterize the polymer product. After 5h of reaction, high monomer conversion was obtained using Phenol and gradually increasing up to 93% with low number average molecular weight of 10,158 g/mol and a relatively narrow PDI of 1.58. A narrower PDi was obtained with Phenol compared with PPh3 and Vitamin D.

Effect of Ligands in MMA AGET ATRP in 2L Stirred Tank Emulsion Reactor