Synthesis of ABABA pentablock copolymers via copper mediated living radical polymerisation
UNSPECIFIED (2003) Synthesis of ABABA pentablock copolymers via copper mediated living radical polymerisation. EUROPEAN POLYMER JOURNAL, 39 (5). pp. 855-862. ISSN 0014-3057Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/S0014-3057(02)00346-4
In this work, the syntheses of poly(butyl methaerylate-b-methyl methacrylate-b-butyl methacrylate) triblock copolymer and poly(methyl methacrylate-b-butyl methacrylate-b-methyl methacrylate-b-butyl methacrylate-b-methyl methacrylate) pentablock copolymers using copper mediated living radical polymerisation are reported. Living radical polymerisations were performed using the system (CuBr)-Br-1/N-(n-propyl)-2-pyridylmethanimine as catalyst in conjunction with a difunctional initiator, the 1,4-(2'-bromo-2'-methylpropionoto)benzene (1). The syntheses of poly(MMA), poly(BMA-b-MMA-b-BMA) and poly(MMA-b-BMA-b-MMA-b-BMA-b-MMA) are described in detail using H-1 NMR spectroscopy and size exclusion chromatography. The living behaviour and the blocking efficiency of these polymerisations were investigated in each case. Difunctional initiator, 1, based on hydroquinone was synthesised and fully characterised and subsequently used to give difunctional poly(methyl methacrylate) macroinitiators with molecular weights up to 54,000 g mol(-1) and polydispersity between 1.07 and 1.32; molecular weights were close to the theoretical values. The difunctional macroinitiators were used to reinitiate butyl methacrylate to give triblock copolymers of M. between 17,500 and 45,700 g mol(-1). Polydispersities remained narrow below 25,000 g mol(-1) but broadened at higher masses. The difunctional triblock macroinitiators were subsequently used to reinitiate methyl methacrylate to give ABABA pentablock copolymers with M-n up to 37,000 g mol(-1) with polydispersity = 1.13. Under certain conditions radical-radical reaction led to a broadening of polydispersity index. (C) 2003 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:||8|
|Page Range:||pp. 855-862|
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