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Eckes D.,Ernst Berl Institute For Technische Und Makromolekulare Chemie | Busch M.,Ernst Berl Institute For Technische Und Makromolekulare Chemie
Macromolecular Symposia | Year: 2016

Summary Simulation aided product design of LDPE often requires deep understanding of polymer architectures produced in the industrial polymerization. Therefore, a hybrid-stochastic approach is further developed that allows for the good description of the typical polymeric microstructure produced in a multi-zone autoclave reactor. The here presented kinetic network goes beyond the basic polymerization scheme and accounts for the propagation of terminal double bonds as well as the mechanical degradation of polymer molecules due to shear stress. By including these reactions a good agreement between experimental and predicted molecular weight distribution is achieved. Furthermore, the comparison of individual contraction factors from experimental data and contraction factors calculated by a 3-D random walker result in a good agreement. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Bauer C.,Ernst Berl Institute For Technische Und Makromolekulare Chemie | Becker K.,Ernst Berl Institute For Technische Und Makromolekulare Chemie | Herrmann T.,Ernst Berl Institute For Technische Und Makromolekulare Chemie | Lilge D.,LyondellBasell Industries | And 2 more authors.
Macromolecular Chemistry and Physics | Year: 2010

This contribution presents a ramble through the past, inspecting the developments of fundamental scientific investigations into the elementary reaction steps of polymerizations. Often the question arises whether benefits from fundamental scientific investigation find their way into industrial practice and how these pay off in better understanding large-scale processes. The high-pressure ethene polymerization is the system of interest here because 1) it is a complex process with a world production of several million tons per year and 2) although dealing with system pressures up to 3000 bar is not an easy task, a long history-if not tradition-exists between the scientific efforts to improve the process and the research groups of Franck and Buback in Karlsruhe, Schönemann and Luft in Darmstadt, and later Buback in Göttingen. The scope of this discussion will range from non-invasive on- and in-line monitoring by spectroscopic methods up to process modeling by advanced kinetic models and their potential for explorative work. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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