A new procedure for the determination of the molar mass distribution of polymers in solution from sedimentation equilibrium

  • M. D. Lechner
  • W. Mächtle
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 86)


A new method for the evaluation of multimodal molar mass distributions W(M) from sedimentation equilibrium measurements of polymers in solutions is proposed. The methods is based on the determination of the experimental measured reduced concentration profile (interference optic) or reduced concentration gradient profile (Schlieren optic) by extrapolation to zero concentration, and subsequent direct calculation of the molar mass distribution by nonlinear regression of the integral equation. The procedure is tested with different polystyrenes and sodium polystyrene sulfonate.

Key words

Ultracentrifuge sedimentation equilibrium molar mass distribution polymer solutions 


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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1991

Authors and Affiliations

  • M. D. Lechner
    • 2
  • W. Mächtle
    • 1
  1. 1.Polymerphysik, Kunststofflaboratorium, BASF AGLudwigshafenFRG
  2. 2.Physikalische ChemieUniversität OsnabrückOsnabrückFRG

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