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Regensburg 2002 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 14: Poster: Kolloidale Systeme

CPP 14.1: Poster

Mittwoch, 13. März 2002, 16:30–18:00, B

The Structure and Interaction of Dendritic Molecules in Solution as Investigated by small-angle-neutron scattering — •Sabine Rosenfeldt1, Nico Dingenouts1, Matthias Ballauff1, Christos Likos2, Nicole Werner3, and Peter Lindner41Polymer Institut, Universität Karlsruhe, Kaiserstr. 12, 76128 Karlsruhe — 2Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf — 3Kekule-Institut für Organische Chemie und Biochemie, Gerhard-Domagk-Str. 1, 3121 Bonn — 4Institut Laue-Langevin, BP 156X, 38042 Grenoble, France

Dendrimers are synthetic branched macromolecules with a well-defined structure that have attracted much interest recently. Here we report the analysis of the equilibrium structure, the endgroup distribution and interaction of flexible dendrimer of 4th and of 5th generation in solution by small-angle neutron scattering (SANS).

Measurements at different contrasts of the solvent (mixture D2O, H2O) at low concentrations gives information about the mass density distribution if all additional contributions, e.g. incoherent background and internal contrast differences, are considered. One results in a mass density distribution of the form of a gaussian. Measurements conducted at finite concentrations revealed that the dendrimers under consideration here exhibit a soft interaction where the interaction potential can be described by a Gaussian.

All findings reported here are in agreement with recent theoretical predictions. This demonstrates that the dendrimer of lower generations studied here are a strongly fluctuating structures.

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