A amphiphilic block copolymer of polybutadiene(PB)-b-poly［2-(dimethylamino)ethyl methacrylate］(PDMAEMA) was synthesized by transformation of living anionic polymerization into atom transfer radical polymerization(ATRP).The macroinitiator

PB containing the 2-bromoisobutyryl end group(PB-Br) was attempted by anionic polymerization of butadiene with butyllithium initiator

then the living PB was chain extended with propylene oxide (PO) and terminated by 2-bromoisobutyryl bromide (BriBBr).By using PB-Br with controlled molecular weight(Mn = 5.7×103)

high bromine content (the bromating efficiency，92.1%) and low polydispersity (Mw/Mn = 1.07) as macroinitiator and CuBr/N

N

N′

N″

N″pentamethyldiethylenetriamine (PMDETA) as catalyst and ligand

ATRP of hydrophilic DMAEMA was realized at 50℃.Kinetics studies reveal a controlled/living polymerization for DMAEMA.The GPC curve of the diblock copolymer indicates a successful initiation and growth of the second block

showing a symmertrical peak due to the removal of uninitiated marcoinitiator.Microphase separation behavior of the diblock copolymer was studied by DSC technique.The properties of the PB-Br and amphiphilic block copolymer PB-b-PDMAEMA were characterized by 1HNMR

FTIR in detail.Polydispersity of the diblock copolymer remained low (Mw/Mn= 1.27) for ATRP of DMAEMA.Estimated by 1H-NMR

the resulting copolymer was expressed as PB(10)-b-PDMAEMA(23).The results show that well-defined target products with controlled molecular weight and low dispersity were obtained.