Abstract
AbstractThe kinetics of radiolabeled poly(styrene sulfonate) adsorbing at a positively‐charged surface were determined using a surface‐charged plastic scintillator as substrate. In situ measurements indicate diffusion‐limited adsorption with the final adsorbance dependent on the solution concentration of polyelectrolyte. An absence of self‐exchange of unlabeled for labeled polymer suggests a thermodynamically irreversible process, at least for highly‐charged polymers on highly‐charged surfaces in the weak screening limit. Charge compensation of sulfonate was determined by displacement of labeled calcium (45Ca2+) probe ions. Compensation is complete for surface sites and only partial for interior sulfonates. The use of radiometric techniques facilitates studies of polyelectrolyte multilayer formation.
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