Publications

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1579 Publications visible to you, out of a total of 1579

Abstract

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Authors: Alexander I. Jordan, Anja Mühlemann, Johanna F. Ziegel

Date Published: 2022

Publication Type: Journal

Abstract

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Authors: Benedikt Schulz, Sebastian Lerch

Date Published: 2022

Publication Type: Journal

Abstract

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Authors: Aurélien Miralles, Jacques Ducasse, Sophie Brouillet, Tomas Flouri, Tomochika Fujisawa, Paschalia Kapli, L. Lacey Knowles, Sangeeta Kumari, Alexandros Stamatakis, Jeet Sukumaran, Sarah Lutteropp, Miguel Vences, Nicolas Puillandre

Date Published: 2022

Publication Type: Journal

Abstract

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Author: Jonathan Teuffel

Date Published: 2022

Publication Type: Master's Thesis

Abstract

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Authors: Umberto Battino, Claudia Lederer-Woods, Claudia Travaglio, Friedrich Konrad Röpke, Brad Gibson

Date Published: 2022

Publication Type: Journal

Abstract (Expand)

In this work, a bivariate kinetic Monte Carlo (kMC) model is constructed to study autoxidation, which is the degradation of polymers in the presence of oxygen. The use of computational methods for the determination of rate coefficients as input for the model is illustrated. Focus is on the presence of short-chain branches (SCB) and unsaturated moieties and their role in the fate of alkyl, alkoxyl and alkylperoxyl radicals in the autoxidation mechanism. The autoxidation kinetics are studied for three model polymers, namely poly(ethylene) (reference case), poly(butadiene) (presence of allylic hydrogens), and poly(isobutylene) (presence of quaternary carbon atoms). Using the kMC model, reaction path analysis shows that the autoxidation mechanism for each of the polymer types follows a chain reaction mechanism, but that the presence of branches/unsaturated moieties influences the dominant reaction pathway in the autoxidation mechanism, and thus also the autoxidation rate. It is shown that the influence of varying oxygen concentration and initiation rate coefficient (e.g. to simulate variable ultraviolet (UV) light intensity) on the dominant pathway is small as their role is mainly situated in the first steps of the chain mechanism.

Authors: Lies De Keer, Paul Van Steenberge, Marie-Françoise Reyniers, Ganna Gryn'ova, Heather M. Aitken, Michelle L. Coote

Date Published: 2022

Publication Type: Journal

Abstract

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Authors: Jan Plier, Matthias Zisler, Jennifer Furkel, Maximilian Knoll, Alexander Marx, Alena Fischer, Kai Polsterer, Mathias H. Konstandin, Stefania Petra

Date Published: 2022

Publication Type: InProceedings

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