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Sedimentation equilibrium studies of synthetic polyelectrolytes by means of interference optical methods

: Görnitz, E.; Hahn, M.; Jaeger, W.; Dautzenberg, H.


Jaenicke, R.:
Analytical ultracentrifugation IV : Contains the contributions of the 10th Symposium on Analytical Ultracentrifugation, held in Regensburg on March 13th and 14th, 1997
Darmstadt: Steinkopff, 1997 (Progress in colloid and polymer science 107)
ISBN: 3-7985-1106-3
ISBN: 978-3-7985-1106-4
Symposium on Analytical Ultracentrifugation <10, 1997, Regensburg>
Fraunhofer IAP ()

Synthetic quaternary ammonium polyelectrolytes have been investigated in aqueous 0.5 M NaCl solution by analytical ultracentrifugation using the "low speed>" sedimentation equilibrium technique with interference detection. Lower molecular mass poly(diallyldimethylammonium chloride) (poly-DADMAC)-samples (M W<10(exp 5) g/mol) and poly(methacryloyloxyethylbenzyl-dimethylammonium chloride) (poly-MADAMBQ) exhibit "ideal" sedimentation equilibrium behavior. Linear log [eta] vs. log M W - and log s O vs. log M W relations could be derived for poly-MADAMBQ. For higher molecular mass poly-DADMAC (M W>10(exp 5) g/mol) and DADMAC-acrylamide copolymers a "non-ideal" solution behavior was observed resulting in deviations between molecular masses M w obtained by sedimentation equilibrium and by elastic light scattering. The experimental conditions desired for the molecular characterization of synthetic polyelectrolytes by sedimentation equilibrium are discussed.