Abstract:

This paper developed a washing-extraction method to remove the residual Cu-ion from the triblock copolymer of poly(methyl methacrylate)-b-poly(L-lactic acid)-b-poly(methyl methacrylate)(PMMA-b-PLLA-b-PMMA) prepared via atom transfer radical polymerization(ATRP). The result is that, when taking dichloromethane(DCM) as the solvent and water or acid as the extractant, the rate of removing Cu-ion can reach as much as 99% and the yield of the block copolymerization was more than 80% followed by washing and extracting 5 times. Compared with other methods, the washing-extraction method can not only save lots of organic solvent, but is also simple and effective. In addition, the washing-extraction method is a green technology, which might be used in the industry.

Key words: atom transfer radical polymerization, PMMA-b-PLLA-b-PMMA, removal of Cu, washing-extraction method