Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Polymer Networks and Dynamics II: Structure and Dynamics

CPP 22.2: Vortrag

Dienstag, 21. März 2017, 09:45–10:00, ZEU 250

Dynamics of internally functionalized dendrimers — •Jonas Grimm1 and Maxim Dolgushev1,21Institute of Physics, Uni Freiburg, Germany — 2Institut Charles Sadron, Strasbourg, France

Recently, new types of dendrimers have been synthesized; among them the internally functionalized dendrimers are of a particular interest. We analyze the dynamics of such functionalized dendrimers that have additional functional units, which do not branch out further.

The dendrimers are modeled in the framework of semiflexible treelike polymers [1], where their topology is described through beads connected by springs (bonds) and semiflexibility is taken into account by constraining the bonds' orientations. The dynamics of the structures is described by a set of Langevin equations. The spectrum of the dynamical matrix appearing in these equations is fundamental for the dynamical properties. In particular, the additional functional beads clearly leave their fingerprints in the eigenvalue spectrum of the dynamical matrix: We find a group of eigenvalues which does not exist for homogeneous dendrimers [2]. This part of the spectrum leads to an additional process in the intermediate frequency region of the imaginary part of the complex dielectric susceptibility. The presence of functional beads is clearly manifested in the local dynamics of the non-functionalized segments on intermediate frequencies [2].

[1] M. Dolgushev and A. Blumen, J. Chem. Phys. 131, 044905 (2009).

[2] J. Grimm and M. Dolgushev, Phys. Chem. Chem. Phys.18, 19050 (2016).

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