Synthesis of amphiphilic poly(methyl methacrylate- b-ethylene oxide) copolymers from monohydroxy telechelic poly(methyl methacrylate) as macroinitiator

Dhara, Mahua G. ; Baskaran, Durairaj ; Sivaram, Swaminathan (2008) Synthesis of amphiphilic poly(methyl methacrylate- b-ethylene oxide) copolymers from monohydroxy telechelic poly(methyl methacrylate) as macroinitiator Journal of Polymer Science Part A: Polymer Chemistry, 46 (6). pp. 2132-2144. ISSN 0887-624X

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/pola.22...

Related URL: http://dx.doi.org/10.1002/pola.22548

Abstract

The synthesis of well-defined poly(methyl methacrylate)-block-poly(ethylene oxide) (PMMA-b-PEO) dibock copolymer through anionic polymerization using monohydroxy telechelic PMMA as macroinitiator is described. Living anionic polymerization of methyl methacrylate was performed using initiators derived from the adduct of diphenylethylene and a suitable alkyllithium, either of which contains a hydroxyl group protected with tert-butyldimethylsilyl moiety in tetrahydrofuran (THF) at -78 °C in the presence of LiClO4. The synthesized telechelic PMMAs had good control of molecular weight with narrow molecular weight distribution (MWD). The 1H NMR and MALDI-TOF MS analysis confirmed quantitative functionalization of chain-ends. Block copolymerization of ethylene oxide was carried out using the terminal hydroxyl group of PMMA as initiator in the presence of potassium counter ion in THF at 35 °C. The PMMA-b-PEO diblock copolymers had moderate control of molecular weight with narrow MWD. The 1H NMR results confirm the absence of trans-esterification reaction of propagating PEO anions onto the ester pendants of PMMA. The micellation behavior of PMMA-b-PEO diblock copolymer was examined in water using 1H NMR and dynamic light scattering.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Anionic Polymerization; Block Copolymers; Synthesis
ID Code:48538
Deposited On:14 Jul 2011 14:22
Last Modified:14 Jul 2011 14:22

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