Macromolecular Chemistry and Physics

Cover image for Vol. 215 Issue 14

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Macro Awards 2003

a) Makromolekulares Kolloquium, Freiburg, Germany (February 27-March 1, 2003)

The Macromolecular Journals sponsored two prizes for the best poster presentations.

The prizes (each, a 1-year free subscription to one of the Macro journals + books to the value of 500 Euro) were awarded to:

Soluble Organic/Inorganic Hybrid Polymers Based on Copper(I) Complexes

Julia Kubasch,* Ulf Velten, Matthias Rehahn

Institute of Chemical Engineering and Macromolecular Science, Darmstadt University of Technology, Petersenstrasse 22, 64287 Darmstadt, Germany

Macromolecules having integrated transition-metal complexes belong to organic/inorganic hybrid polymers. In many cases the occurrence of coordinative bonds in these polymers leads to exciting chemical and physical properties which can be used in catalysis, optics and electronics. To realize the numerous potential applications, profound knowledge is required about the relationship between constitution and properties.

In our work we synthesize and characterize novel metal-containing polymers based on kinetically labile copper(I)-polyimine complexes[1,2]. Using these coordination polyelectrolytes, we study the influence of the constitution of the polymers on their kinetic lability and their properties in solution. In particular we are interested in whether or not these kinetically labile architectures can be stabilized by the introduction of bulky dendritic groups.

[1] U. Velten, M. Rehahn, Macromol. Chem. Phys. 1998, 199, 127.

[2] B. Lahn, M. Rehahn, e-Polymers 2002, 001.

and to

Crosslinkable Hole Transport Molecules for Application in Multi Layer Organic-Light-Emitting-Devices ("OLED")

M. Rojahn,* 1 O. Nuyken,1 D.C. Müller,2 N. Reckefuß,2 K. Meerholz2

1 Lehrstuhl für Makromolekulare Stoffe, Institut für Technische Chemie, Technische Universität München, Lichtenbergstr. 4, 85747 Garching b. München, Germany

2 Lehrstuhl für Physikalische Chemie, Universität zu Köln, Luxemburgerstr. 116, 50939 Köln (Lindenthal), Germany

In this work, various crosslinkable TPD-type hole transport molecules with pendant oxetane groups for application in multi-layer-OLEDs are presented. In comparison to former works, novel photo-crosslinkable materials with enhanced crosslinking properties and broader electro-chemical range have been obtained. Furthermore, a possible route to crosslinkable, Alq3-based electron transport molecules and first crosslinking experiments thereof are presented.

All materials were tested concerning crosslinking behavior, electro chemical properties and their application in multi-layer organic light emitting devices. The presented results give excellent proof of this strategy's potential in solution based preparation of multi layer devices.

b) Bayreuth Polymer Symposium, Bayreuth, Germany (September 28-30, 2003)

The Macromolecular Journals sponsored two prizes for the best poster presentations.

The prizes (each, a 1-year free subscription to one of the Macro journals + books to the value of 500 Euro) were awarded to:

Synthesis and Characterisation of Porous and Non-Porous Monodisperse Colloidal TiO2 Particles

Johanna Widoniak,* Stefanie Eiden, Georg Maret

Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany

Monodisperse spherical titania particles of variable sizes are produced in a sol-gel synthesis from Ti(EtO)4 in ethanol with addition of a salt or a polymer solution. The influence of different salt ions or polymer molecules on the size and on the size distribution of the final particles was investigated. Nitrogen absorption measurements revealed that the addition of polymers yields hollow and porous titania colloids.

The amorphous hydrous titania particles were characterized by electron microscopy, thermogravimetry, 1H-MAS-NMR and X-ray absorption spectroscopy and electrophoresis. Model for formation mechanism of titania colloids were developed

and to

Loading of Hydrophilic Dyes into Amphipolar Core-Shell Nanoparticles

M. Groß, M. Schmidt, M. Maskos

Johannes-Gutenberg University, Department of Physical Chemistry, Welder Weg 11, D-55099 Mainz, Germany

Polymeric nanocontainers with a polar core and a nonpolar shell ("unimolecular micelles") have been prepared by a grafting-through approach from anionically synthesized end-functionalized block co-oligomers ("block co-macromonomers").[1] It has been proven that these amphipolar nanoparticles facilitate the solubilization of otherwise insoluble dye molecules in organic solvents ("phase transfer"). The nonpolar shell (polystyrene) of the particle provides the solubility in the organic medium, while the polar core (neutral or quaternized poly(2-vinylpyridine)) is responsible for the interaction with the dye molecules. Phase transfer is achieved by simply bringing an organic solution of the polymer into contact with the dye powder ("solid/liquid phase transfer") or an aqueous solution of the dye ("liquid/liquid phase transfer"). Both transfer types exhibit different transfer kinetics[2] and in the case of the liquid/liquid phase transfer, the distribution of the dye in both phases can be described by Langmuir isotherms. The amount of dye that can be transferred into the organic phase depends strongly on the structure of the dye and of the polymeric nanocontainers. High loading ratios of more than 1 g of dye per gram polymer can be achieved.

[1] R. Djalali, N. Hugenberg, K. Fischer, M. Schmidt, Macromol. Rapid Commun. 1999, 20, 44.

[2] F. Sirovski, C. Reichardt, et al., Tetrahedron 1999, 55, 6363.

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