The Radical Polymerazation In The Homogeneous System With MMA As The Monomer

Atom transfer radical polymerization(ATRP) is an effcetive, controlled radical polymerization technique utilized to synthesize a number of polymers with controlled molecular weights, architectures and distribution of molecular weight methods. However,there are some imperfections in the traditional ATRP such as a mass of catalyst used, and the instability resulting in the rigorous experimental conditions. So many optimization methods has been developed on the base of the traditional ATRP. Because of the use of the high price transition metal catalyst, the conditions of the reaction has become simple, and it reduces the influnce of the water and oxygen in the reactions. Therefore the ARGET ATRP has been developed widely. While the solvent in ARGET ATRP such as toluene,DMF etc. have high toxicity, the advance of the industrialization of ARGET ATRP is blocked.At first, useing the toulene as the solvent, the MMA as the monomer, Sn(EH)2 as the redcuing agent, CuBr2 and PMDETA as the catalyst system, reserched the reaction dynamics and the properties of living/controll at 65 ℃. It demostrated that the polymerazation is ARGET ATRP in the conditions. Then the influnces of the mass of the Sn(EH)2, CuBr2, PMDETA are reserched to determine the best ratio. With the best ratio,the polarity of the solvent has been demostrated. The experiment results show that the polarity promote the polymaerazation rate and reduce the controll properties.At last, useing the ethanol as the solvent, reaserched the effects of water in ARGET ATRP.The results indicated that when PMDETA/CuBr2 ≧ 10, 10 ≦ Sn(EH)2/CuBr2<20, and H2O/ethanol(wt%)≦10, the molecular weights and distribution of molecular weight could be well controlled.