Publikationsserver der Universitätsbibliothek Marburg
Titel:Herstellung pfropfpolymerisierter Ionenaustauscher mit Aufklärung des Reaktionsmechanismus
Autor:Kaltz, Achim
Weitere Beteiligte: Seubert, Andreas (Prof. Dr.)
Veröffentlicht:2017
URI:https://archiv.ub.uni-marburg.de/diss/z2017/0789
URN: urn:nbn:de:hebis:04-z2017-07895
DOI: https://doi.org/10.17192/z2017.0789
DDC: Chemie
Titel (trans.):Preparation of graft-polymerized ion-exchangers and investigation of the reaction mechanism
Publikationsdatum:2017-12-21
Lizenz:https://creativecommons.org/licenses/by-nc-sa/4.0

Dokument

Schlagwörter:
synthesis, Anionenaus-tauscher, grafting, Anionenaustauscher, Pfropfcopolymerisation, Selektivität, Selektivität, selectivity, Ionenchromatographie, Ionenaustauschchromatographie, Ionenchromatographie, mechanism, Synthese, Mechanismus, chain-length, Kettenlänge, ion chromatography, Pfropfpolymerisation, graft-polymerization, anion ex-changers

Zusammenfassung:
In dieser Arbeit wurde eine reproduzierbare Methode zur Herstellung von Anionenaustauschern auf Basis von Polystyrol/Divinylbenzol-Copolymeren entwickelt und diese eingehend untersucht. Die Methode beruht auf der radikalischen Pfropfpolymerisation ionischer Styrolderivate mithilfe eines Radikalstarters an den vinylischen Doppelbindungen des Grundmaterials. Diese Untersuchungen hatten das Ziel Zusammenhänge zwischen chemischer Struktur und den Eigenschaften der Anionenaustauscher zu identifizieren und diese mithilfe der Methode zu steuern. Es konnte identifiziert werden, dass die radikalische Pfropfpolymerisation sowohl in freier Lösung als auch auf der Oberfläche des Polymer initiiert werden kann und dass sowohl Radikalstarter als auch das verwendete organische Lösungsmittel den Ort der Initiierung beeinflussen. Es gelang außerdem den Einfluss verschiedener Reaktionsparameter auf die Selektivität und die Trenneffizienz, sowie die chemische Struktur der Anionenaustauscher zu identifizieren. Dabei konnte gezeigt werden, dass auf der Polymeroberfläche nur sehr kurze Ketten an Austauschergruppen generiert werden und die Kettenlänge in diesem Bereich keinen Einfluss auf die Selektivität besitzt. Weitere Untersuchungen der Austauscher konnten stattdessen Hinweise darauf liefern, dass die zur Pfropfpolymerisation parallel ablaufende Oxidation des Grundpolymers durch den Radikalstarter die Selektivität der Austauschermaterialien bestimmt.

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