화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.19, No.10, 1022-1028, October, 2011
DOI10.1007/s13233-011-1012-8  Export Citation
Synthesis and Characterization of BAB and CBABC Tri- and PentaBlock Copolymers via Atom Transfer Radical Polymerization
Santosh Kumar1, 2, Jae-Suk Lee2, and C. N. Murthy1, 2, †
  • 1Applied Chemistry Department, Macromolecular Materials Laboratory, Faculty of Technology & Engineering, Kalabhavan, The M. S. University of Baroda, Vadodara, Gujarat, 390001, India
  • 2Department of Nanobio Materials and Electronics, and School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 500-712, Korea
E-mail:
Atom transfer radical polymerization (ATRP) technique was applied successfully for the synthesis of poly(n-butyl methacrylate-b-styrene-b-n-butyl methacrylate) (PBMA-b-PS-b-PBMA), (BAB) and poly(methyl methacrylate-b-n-butyl methacrylate-b-styrene-b-n-butyl methacrylate-b-methyl methacrylate) (PMMA-b-PBMAb-PS-b-PBMA-b-PMMA), (CBABC) linear tri- and pentablock copolymers, respectively, in solution for the first time. Difunctional polystyrene macroinitiator that contains a bromide end-group was prepared by ATRP of styrene with dimethyl-2,6-dibromoheptanedioate (DMDBHD). The formation of block copolymers was confirmed by gel permeation chromatography (GPC), nuclear magnetic resonance (1H NMR) spectroscopy, and differential scanning calorimetry (DSC). Good agreement was observed between the theoretical and experimental molecular weights. The molecular weight distribution (MWD) was narrow and did not change much with the progress of the reaction. A linear increase in the number average molecular weight (Mn) with conversion was observed indicating that the polymerizations followed a ‘living’/controlled process. Both BAB and CBABC block copolymers showed core-shell type flower-like micellar structures when toluene is used as a selective solvent for A block (polystyrene).
Keywords:atom transfer radical polymerization (ATRP);block copolymers;copolymerization;DSC;micelles;molecular weight distribution;TEM.
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