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Synthesis and Characterization of Amphiphilic AB2 Star Copolymers Comprised of Poly(ethylene oxide) and Polystyrene Blocks by ATRP
Dairen Lu,Kui Xu,Yun Wang,Kang Tao,Ruke Bai * #
University of Science and Technology of China
*Correspondence author
#Submitted by
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Funding: 国家自然科学基金,教育部博士点基金（No.20474059,200040358017）
Opened online:30 March 2007
Accepted by: none
Citation: Dairen Lu,Kui Xu,Yun Wang.Synthesis and Characterization of Amphiphilic AB2 Star Copolymers Comprised of Poly(ethylene oxide) and Polystyrene Blocks by ATRP [OL]. [30 March 2007] http://en.paper.edu.cn/en_releasepaper/content/11834
 
 
A new macroinitiator MPEO-Br2 was synthesized by the reaction of monomethoxy end-capped poly(ethylene oxide) with 3, 5-bis(bromomethyl)benzoic chloride, and then used to initiate the polymerization of styrene at 110oC with CuBr/bpy as catalyst system. The results of polymerization show the characteristics of living free radical polymerization. There exists a linear relationship between ln([M]0/[M]) and polymerization time, and the molecular weights increase linearly as the increase of monomer conversion with low polydispersity. Furthermore, well-defined amphiphilic AB2 star copolymers were prepared and confirmed from the structure and molecular weight of the copolymers characterized by 1H-NMR and GPC.
Keywords: AB2 star copolymer; Atom transfer radical polymerization; Polystyrene
 
 
 

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