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http://dx.doi.org/10.7317/pk.2012.36.5.628

Measurement of Polymer Chain Depletion Layer in the Poly(vinyl alcohol)/Dimethyl Sulfoxide/Polystyrene Latex System by Dynamic Light Scattering  

Eom, Hyo-Sang (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Park, Il-Hyun (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Publication Information
Polymer(Korea) / v.36, no.5, 2012 , pp. 628-636 More about this Journal
Abstract
The polymer concentration dependence of depletion layer was investigated by means of dynamic light scattering after the very small amount of polystyrene spherical latex particles was added into the matrix solution of poly(vinyl alcohol)(PVA)/dimethyl sulfoxide. At the dilute regime, the magnitude of depletion layer kept constant at the level of $63{\pm}3%$ of the radius of gyration of the corresponding PVA chain. Next, at the early semi-dilute regime of $1.5{\leq}C[{\eta}]{\leq}3$, polymer concentration dependence of the layer thickness ${\delta}$ was obtained as ${\delta}{\sim}C^{-0.8}$, and this experimental value was very close to theoretical one of -0.75. However it was observed above $C[{\eta}]$ >3 that its thickness decreased abruptly, and this was ascribed to aggregation effect of latex particles which was driven by Oosawa type attractive interaction.
Keywords
depletion layer; semi-dilute; effective viscosity; aggregation; light scattering;
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