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Albertin, L.
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article
Well-defined diblock glycopolymers from RAFT polymerization in homogeneous aqueous medium
Abstract
Reversible addition-fragmentation chain transfer polymerization was applied to the synthesis of well-defined diblock glycopolymers carrying different cyclic carbohydrates on the two blocks. The macroRAFT agents poly(methyl 6-O-methacryloyl-α-D-glucoside) dithiobenzoate and poly(2- methacryloxyethyl glucoside) dithiobenzoate were prepared by RAFT polymerization of the corresponding glycomonomers with (4-cyanopentanoic acid)-4- dithiobenzoate as the chain transfer agent. The reactions were stopped around 85% conversion in order to preserve the highest possible end-of-chain- functionality and the glycopolymers were isolated by precipitation in methanol. Chain extension with 2-methacryloxyethyl glucoside and methyl 6-O-methacryloyl-α-D-mannoside afforded poly(methyl 6-O-methacryloyl- α-D-glucoside-block-2-methacryloxyethyl glucoside) and poly(2-methacryloxyethyl glucoside-block-methyl 6-O-methacryloyl-α-D- mannoside), respectively, having a predetermined molecular weight and narrow polydispersity (PDI ≤ 1.20). The structure of the prepared polymers was confirmed by proton and carbon NMR and their thermal properties investigated via DSC. © 2005 American Chemical Society.