Unique Behavior of Dendritic Macromolecules: Intrinsic Viscosity of Polyether Dendrimers

T. H. Mourey*, S. R. Turner, Michael Rubinstein, Jean Frechet, C. J. Hawker, K. L. Wooley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

529 Scopus citations

Abstract

Polyether dendrimers made by the convergent growth approach are characterized by size exclusion chromatography (SEC) with coupled molecular weight sensitive detection. SEC chromatograms are as narrow as those of polystyrene with Mw/Mn ≈ 1.04 and do not broaden appreciably with increasing dendrimer generation, g. Values of Mw obtained from light scattering detection are in agreement with the molecular weights of the structures anticipated from the synthetic strategy. Intrinsic viscosity, obtained from SEC viscosity detection, passes through a characteristic maximum as a function of g while the refractive index increment appears to pass through a minimum. Hydrodynamic radii, calculated from intrinsic viscosity data, increase approximately linearly with dendrimer generation. The data are in agreement with recent simulations of Lescanec and Muthukumar that predict a maximum in intrinsic viscosity as a function of g. This suggests, but does not directly prove, that the density of these dendrimers decreases monotonically from the center.

Original languageEnglish (US)
Pages (from-to)2401-2406
Number of pages6
JournalMacromolecules
Volume25
Issue number9
DOIs
StatePublished - Apr 1 1992

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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