Adsorption of anionic polyelectrolytes to dioctadecyldimethylammonium bromide monolayers |
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Authors: | J Engelking H Menzel |
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Institution: | Institut für Makromolekulare Chemie der Universit?t Hannover, Am Kleinen Felde 30, 30167 Hannover, Germany, DE
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Abstract: | Monolayers of dioctadecyldimethylammonium bromide (DODA) at the air/water interface were used as model for charged surfaces
to study the adsorption of anionic polyelectrolytes. After spreading on a pure water surface the monolayers were compressed
and subsequently transferred onto a polyelectrolyte solution employing the Fromherz technique. The polyelectrolyte adsorption
was monitored by recording the changes in surface pressure at constant area. For poly(styrene sulfonate) and carboxymethylcellulose
the plot of the surface pressure as function of time gave curves which indicate a direct correlation between the adsorbed
amount and surface pressure as well as a solely diffusion controlled process. In the case of rigid rod-like poly(p-phenylene sulfonate)s the situation is more complicated. Plotting the surface pressure as function of time results in a curve
with sigmoidal shape, characterized by an induction period. The induction period can be explained by a domain formation, which
can be treated like a crystallization process. Employing the Avrami expression developed for polymer crystallization, the
change in the surface pressure upon adsorption of rigid rod-like poly(p-phenylene sulfonate)s can be described.
Received 1st July 2000 and Received in final form 7 December 2000 |
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Keywords: | PACS 68 18 -g Langmuir-Blodgett films on liquids – 68 43 Mn Adsorption/desorption kinetics – 61 41 +e Polymers elastomers and plastics |
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