Journal
BIOMACROMOLECULES
Volume 4, Issue 5, Pages 1386-1393Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bm034126a
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Amphiphilic random, gradient, and block copolymers of 2-(dimethylamino)ethyl methacrylate (DMAEMA) and n-butyl methacrylate (BMA) were synthesized by atom transfer radical polymerization (ATRP) in water/2-propanol mixtures using a methoxy-poly(ethylene glycol) (MPEG) (M-n = 2000) macroinitiator. Kinetic studies indicate that the copolymerization is well controlled with molecular weights increasing linearly with conversion. Copolymers with molecular weights up to M-n = 34 000 and low polydispersities (M-w/M-n = 1.11-1.47) were prepared. The reactivity ratios were calculated for the copolymerizations catalyzed by CuBr/bpy, (r(DMAEMA) = 1.07, r(BMA) = 1.24). The thermosensitivity and aggregation properties of the random, gradient, and block copolymers significantly depended on the architecture of the copolymers. The lower critical solution temperature of MPEG-b-PDMAEMA(84) was 38 degreesC (5 wt % in water).
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