Hydrodynamic Properties of Short NaPMA in Excess Salt: a Dynamic Light Scattering StudyReport as inadecuate




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Croatica Chemica Acta, Vol.80 No.3-4 November 2007. -

Diffusion of short polymethacrylic acid Na-PMA, M = 6600 g-mol in aqueous solution has

been investigated by means of dynamic light scattering at different scattering angles, ionic

strengths, pH, and polymer concentrations in the pH range between 2.1 and 8.2. At pH = 2.14,

only one fast relaxation mode was observed whereas at higher pH-values a fast and a slow

mode could be determined. Whereas the slow mode is due to collective diffusion of polyelectrolyte

domains, the fast mode at a sufficiently high ionic strength I > 0.1 mol-L is caused by

the diffusion of single polyelectrolyte chains. From the dependence on the polymer concentration,

self-diffusion coefficients at infinite dilution, the corresponding hydrodynamic radii, and

second virial coefficients were determined and discussed. It was concluded that PMA exists as

a random coil in excess electrolyte solution in the whole pH range, although a slight stretching

was observed for pH > 4.

polymethacrylic acid; PMA; dynamic light scattering; DLS; diffusion; polyelectrolyte



Author: Sabina Haber-Pohlmeier - ; ITMC, Technical University Aachen, Aachen, Germany Andreas Pohlmeier - ; ICG 4, Research Center Jülic

Source: http://hrcak.srce.hr/



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