Structure and interaction of flexible dendrimers in concentrated solution

Details Structure and interaction of flexible dendrimers in concentrated solution Structure and interaction of flexible dendrimers in concentrated solution

2009-07-07

arxiv.org/abs/0907.1241v1

The Journal of Chemical Physics 130, 244901 (2009)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 4 figures

Scientific paper

10.1063/1.3155208

We study the influence of mutual interaction on the conformation of flexible poly(propyleneamine) dendrimers of fourth generation in concentrated solution. Mixtures of dendrimers with protonated and deuterated end groups are investigated by small-angle neutron scattering up to volume fractions of 0.23. This value is in the range of the overlap concentration of the dendrimers. The contrast between the solute and the solvent was varied by using mixtures of protonated and deuterated solvents. This allows us to investigate the partial structure factors of the deuterated dendrimers in detail. An analysis of the measured scattering intensities reveals that the shape of the flexible dendrimers is practically independent of the concentration in contrast to the pronounced conformational changes of flexible linear polymers.

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