Abstract
The atom transfer radical polymerization technique was used to synthesize poly(methacrylic acid-block-methyl methacrylate) (P(MAA102-b-MMA10)) copolymer in order to study the aggregation behavior in aqueous solution over the course of neutralization. A combination of static and dynamic light scattering (SLS, DLS) and potentiometric titration techniques were used to investigate the size and shape of the micelle at various degrees of neutralization. The hydrodynamic radius (Rh) determined from dynamic light scattering increases from ∼26 nm (for unneutralized) to ∼42 nm (for completely neutralized sample). Both potentiometric and laser light scattering studies indicate the formation of a core−shell micelle. The weighted average molecular weights of the polymer and micelle are 1.18 × 104 and 2.25 × 105 g/mol, respectively, which suggests that the aggregation number of the micelle is ∼20.
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