Synthesis and characterization of amphiphilic triblock polymers by copper mediated living radical polymerization
UNSPECIFIED. (2003) Synthesis and characterization of amphiphilic triblock polymers by copper mediated living radical polymerization. EUROPEAN POLYMER JOURNAL, 39 (4). pp. 633-639. ISSN 0014-3057Full text not available from this repository.
2-Dimethylaminoethyl methacrylate (DMAEMA) and 2-diethylaminoethyl methacrylate (DEAEMA) block copolymers have been synthesized by using poly(ethylene glycol), poly(tetrahydrofuran) (PTHF) and poly(ethylene butylenes) macroinitiators with copper mediated living radical polymerization. The use of difunctional macroinitiator gave ABA block copolymers with narrow polydispersities (PDI) and controlled number average molecular weights (M-n's). By using DMAEMA, polymerizations proceed with excellent first order kinetics indicative of well-controlled living polymerization. Online H-1 NMR monitoring has been used to investigate the polymerization of DEAEMA. The first order kinetic plots for the polymerization of DEAMA showed two different rate regimes ascribed to an induction period which is not observed for DMAEMA. ABA triblock copolymers with DMAEMA as the A blocks and PTHF or PBD as B blocks leads to amphiphilic block copolymers with M-n's between 22 and 24 K (PDI 1.24-1.32) which form aggregates/micelles in solution. The critical aggregation concentrations, as determined by pyrene fluorimetry, are 0.07 and 0.03 g dm(-1) for PTHF- and PBD-containing triblocks respectively. (C) 2002 Elsevier Science Ltd. All rights reserved.
|Item Type:||Journal Article|
|Subjects:||Q Science > QD Chemistry|
|Journal or Publication Title:||EUROPEAN POLYMER JOURNAL|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Number of Pages:||7|
|Page Range:||pp. 633-639|
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