Volume 68, Number 1, October 2004
|Page(s)||65 - 71|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2004|
Scaling of dynamics in 2d semi-dilute polymer solutions
Cavendish Laboratory, University of Cambridge Madingley Road, Cambridge CB3 0HE, UK
2 Department of Physics, UMIST - Manchester M60 1QD, UK
Accepted: 29 July 2004
We consider the dynamics of thermal concentration fluctuations in polymer Langmuir monolayers, probed with surface light scattering. We present data on the proteins β-lactoglobulin and β-casein and on the synthetic polymers Poly(vinyl acetate) and Poly(4-hydroxystyrene). We show that for all these systems, in the semi-dilute concentration regime, there is a power law dependency of both the elastic and viscous components of the dilational modulus on the concentration. We find that for all the systems considered, the viscosity scales with a power that is double that of the elasticity. A simple explanation for this universal dynamical behavior in semidilute polymer monolayers is suggested.
PACS: 68.03.Cd – Surface tension and related phenomena / 83.85.Ei – Optical methods; rheo-optics
© EDP Sciences, 2004
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