高分子科学系列讲座212讲：Prof.Harald Pasch，Chemical Composition and Microstructure Analysis of Polymers by Multidimensional Column- and Channel-Based Separations----高分子物理与化学国家重点实验室

学术报告

高分子科学系列讲座212讲：Prof.Harald Pasch，Chemical Composition and Microstructure Analysis of Polymers by Multidimensional Column- and Channel-Based Separations

文章来源：发布时间：2015-08-24

报告题目：Chemical Composition and Microstructure Analysis of Polymers by Multidimensional Column- and Channel-Based Separations（NO.PSLAB212-PS2015-15)

报告人：Prof. Harald Pasch

单　　位：Department of Chemistry and Polymer Science, University of Stellenbosch, South Africa

报告时间：2015年8月26日（星期三）上午9:30

报告地点：主楼四楼学术报告厅（410室）

报告内容摘要：

Complex polymers are distributed in more than one direction of molecular heterogeneity. In addition to the molar mass distribution, they are frequently distributed with respect to chemical composition, functionality, and molecular architecture. For the characterization of the different types of molecular heterogeneity it is necessary to use a wide range of analytical techniques. Preferably, these techniques should be selective towards a specific type of heterogeneity. The combination of two selective analytical techniques is assumed to yield two-dimensional information on the molecular heterogeneity.
For the analysis of complex polymers different liquid chromatographic techniques have been developed, including SEC being selective towards molecular size and LAC/LCCC being selective towards chemical heterogeneity.
The present talk presents some principle ideas on the analysis of complex polymers regarding chemical composition and microstructure using advanced fractionation and spectroscopic methods. The basic principles of multidimensional chromatography will be discussed and its capability in chemical composition and microstructure analysis will be highlighted. For a number of applications it will be demonstrated, that multidimensional chromatography is a perfect tool for analyzing random and block copolymers. The online coupling of advanced chromatography with 1H-NMR does not only provide quantitative information on the chemical composition as a function of molar mass but also on the microstructure (tacticity) of individual stereo blocks.
As an alternative separation method regarding chemical composition and microstructure, field flow fractionation (FFF) will be presented. FFF as a channel-based technique offers the possibility to analyze a wide variety of macromolecules and particles ranging from the nanometer to the micrometer range with high resolution. The present talk will discuss a number of applications where column-based fractionation methods reach their limits. In addition, some very recent results on the microstructure separation using Thermal FFF will be presented.

References

1.H. Pasch, B. Trathnigg. Multidimensional HPLC of Polymers. Springer-Verlag, Berlin-Heidelberg-New York, 2013, ISBN 978-3-642-36079-4
2.A. Makan, P. Sinha, N. Ngaza, W. van Aswegen, H. Pasch, Anal. Bioanal. Chem. 405 (2013) 9041-9047
3.H. Pasch, A.C. Makan, H. Chirowodza, N. Ngaza, W. Hiller, Anal. Bioanal. Chem. 406 (2014) 1585-1596
4.W. van Aswegen, W. Hiller, M. Hehn, H. Pasch, Macromol. Rapid Commun. 34 (2013) 1098-1103
5.W. Hiller, W. van Aswegen, M. Hehn, H. Pasch, Macromolecules 46 (2013) 2544-2552
6.G. Greyling, H. Pasch, Macromol. Rapid Commun. 35 (2014) 1846-51
7.M.I. Malik, H. Pasch, Progr. Polym. Sci. 39 (2014) 87-123
8.G. Greyling, H. Pasch, Anal. Chem. 87 (2015) 3011-3018

报告人介绍

　Prof.Harald Pasch

Harald Pasch finished his M.Sc. in Chemistry in 1976 at University of Odessa, former USSR. Then he obtained his Ph.D. in 1982 and D.Sc. (Habilitation) in 1987 in Macromolecular Chemistry at Academy of Sciences, Berlin, Germany. From 1987 to 2007, Harald Pasch worked in Kuwait Institute for Scientific Research (Kuwait), Institute of Organic Chemistry (Berlin, Germany) and German Institute for Polymers (Darmstadt, Germany). Since 2008, Harald Pasch took a Full Professor position (SASOL Chair in Analytical Polymer Chemistry) at the Department of Chemistry and Polymer Science, University of Stellenbosch, Stellenbosch, South Africa. He is the University Distinguished Professor and a Fellow of the Royal Society of South Africa.
Harald Pasch published more than 300 scientific papers and more than 20 book contributions and reviews. He is also the author of the textbooks “HPLC of Polymers” (1997), “MALDI-TOF Mass Spectrometry of Synthetic Polymers” (2003), “Multidimensional HPLC of Polymers” (2013) and “Advanced Separation Techniques for Polyolefins” (2014).

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