Association Behavior of Poly(methacrylic acid)-block-Poly(methyl methacrylate) in Aqueous Medium: Potentiometric and Laser Light Scattering Studies
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MEBCS002.pdf
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606c48ed6c024b2da9909a97a0be096f
Author(s)
Palaniswamy, R.
Wang, C
Tam, Michael K. C.
Gan, L.H.
Date Issued
January 2003
Series/Report no.
Molecular Engineering of Biological and Chemical Systems (MEBCS);
Abstract
Atom transfer radical polymerisation (ATRP) 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 ~26nm (for unneutralized) to ~42nm (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 1.18x10⁴ and 2.25 x 10⁵ g/mol respectively, which suggests that the aggregation number of the micelle is ~20.
Subjects
ATRP
aggregation number
core shell micelle
light scattering
potentiometric titration
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