und Polymerwissenschaftliches Seminar in der BAM

3. April 2018

Presenter: Prof. Dr. Wolf Hiller Technische Universität Dortmund Faculty of Chemistry and Chemical Biology

Summary: Polymers are very complex molecules differing by topology, chain length, chemical composition as well as microstructure. Moreover, polymers also provide distributions of these parameters. In particular, the weight average (Mw) and the number average molar masses (Mn) are of main interest. Size exclusion chromatography (SEC) is the most common method for the determination of these molar mass data. It separates the macromolecules according to the hydrodynamic radii and provides the molar mass distribution. – Nevertheless, the correct determination of molar masses also depends on further parameters. In particular, the determination of molar masses of copolymers requires the correct chemical composition of the comonomers as well as the chemical heterogeneity. Therefore, multi-dimensional chromatography or the online coupling of chromatography with spectroscopy is necessary for a comprehensive analysis. Especially, the online coupling of chromatography with NMR is a very powerful tool for the characterization of copolymers. It provides quantitative data and allows particularly for the direct determination of the chemical composition without any calibrations as well as the determination of the microstructure.

Location: Bundesanstalt für Materialforschung und -prüfung (BAM) Branch Adlershof, Richard-Willstätter-Str. 11, 12489 Berlin Building 8.05 / Lecture Hall