A block copolymer

poly(2-cinnamoyloxyethyl acrylate)-block-poly［(tert-butyl acrylate)-ran-(styrene)］ (PCEA-b-P(tBA-r-St))

was synthesized by ATRP. Some factors

such as solvents

monomer concentration

and the reserved ratio of end initiating groups after the preparation of the first block influencing the PDI and the control of molecular weight in the synthetic process were discussed. Acetonitrile was found as one of the most suitable solvent in using ATRP to synthesize poly(2-trimethylsilyloxyethyl acrylate) (PHEA-TMS) due to the outstanding controlling of the polymers molecular weight distribution as low as close to monodisperse. The structure of the prepared diblock copolymer was confirmed as PCEA53-b-(PtBA111-r-PS138) with 1H-NMR analysis. It shows a narrow distribution of molecular weight of 1.18 determined by GPC method. This diblock copolymer can be dispersed directly in some selective solvents

such as 1-chlorodecane and cyclopentane

to form the micelles. It was investigated by TEM that a unique aggregated-cylinder structure was formed by the self-assembly of the block polymer in 1-chlorodecane following slow evaporation of the solvent because 1-chlorodecane has a very high boiling point of 223℃. While in cyclopentane which has a much lower boiling point of 49.3℃

due to the quick volatilization of solvent the block copolymer only self assembled into some short rodlike micelles.