AbstractMit den Themen Energie – Materialien – Synthese präsentiert sich die Chemie in diesem Jahr auf dem GDCh‐Wissenschaftsforum in Ulm als Querschnittswissenschaft für die Lösung wichtiger Zukunftsfragen. Einen Eindruck vom Programm mit weit über 200 Vorträgen, Symposien, Podiumsdiskussionen und rund 300 Postern, geben die GDCh‐Fachgruppen und ‐Organisationen.

A new synthetic strategy for PUF copolymers based on three steps was developed. In the first step, two precondensates of phenol with formaldehyde and urea with formaldehyde, respectively, were produced. In the second step, the two precondensates were mixed and condensed using a heterogeneous catalyst in a tube reactor at 90 degrees C. The last step is a vacuum distillation to reach the final copolymer compositions. With regard to the properties, the products can be used as adhesive. The copolymers were analysed by gel permeation chromatography (GPC), C-13-NMR-spectroscopy, and MALDI-TOF mass spectrometry. (c) 2006 Wiley Periodicals, Inc.

AbstractMit der on‐line‐gekoppelten 2‐D‐Chromatographie lassen sich chemisch uneinheitlich aufgebaute Polymere mit nur einer Probenaufgabe zuerst nach ihrer chemischen Zusammensetzung und anschließend automatisch nach ihrer Molmasse trennen.

We have used on-line HPLC-NMR to analyze complex polymer systems. This combined technique takes advantage of the separation power of HPLC and the structure elucidation ability of NMR. It is also relatively easy to do and provide very valuable information. The utility of the HPLC-NMR has been shown for three polymeric systems: a) determination of chemical structure and degree of polymerization of technical-grade poly(ethylene oxide); b) analysis of end-group structure, degree of polymerization, and tacticity of oligostyrene; c) determination of chemical composition and chemical heterogeneity at high conversions of random poly(styrene-co- ethyl acrylate).

Polymerizable surfactants (surfiners) 12-acryloyloxydodecanoic acid and 11-acrylamidoundecanoic acid and their respective sodium salts were prepared and then polymerized to form their corresponding oligomers using reversible addition-fragmentation chain transfer (RAFT). Different concentrations of both the surfiners, their sodium salts, and their RAFT oligomers were used as polysoaps in the emulsion polymerization of styrene. Stabilities of the pre-emulsions before polymerization were determined and compared. After polymerization, particle sizes and polydispersities of the resulting polystyrene latices were determined. Sodium dodecyl sulfate (SDS) was used as a reference surfactant to compare the particle sizes and stabilities of the pre-emulsions prepared using surfiners and polymeric surfactants (polysoaps) as particle stabilizers.Emulsion polymerization of styrene using these surfiners and polysoaps all led to latices which were stable for a period of more than six months, as indicated by constant particle sizes, whereas latices prepared using the conventional surfactant, SDS, were not as stable.

This article describes the direct analysis of additives by pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS). Using this method it is possible to identify additives quickly and reliably without separation of the polymer matrix. A small specimen of the sample is pyrolysed, i. e. degraded under inert gas atmosphere. The pyrolysis products are separated by gas chromatography and ionized in the mass spectrometer by electron-impact ionization. By comparing the results with library data it is possible to identify unknown additives unambiguously and with high accuracy.

This article describes the direct analysis of additives by pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS). Using this method it is possible to identify additives quickly and reliably without separation of the polymer matrix. A small specimen of the sample is pyrolysed, i. e. degraded under inert gas atmosphere. The pyrolysis products are separated by gas chromatography and ionized in the mass spectrometer by electron-impact ionization. By comparing the results with library data it is possible to identify unknown additives unambiguously and with high accuracy.