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dc.contributor.advisor Buback, Michael Prof. Dr. de
dc.contributor.author Minaux, Eric de
dc.date.accessioned 2001-07-26T15:07:03Z de
dc.date.accessioned 2013-01-18T10:40:01Z de
dc.date.available 2013-01-30T23:51:25Z de
dc.date.issued 2001-07-26 de
dc.identifier.uri http://hdl.handle.net/11858/00-1735-0000-0006-AE8D-8 de
dc.format.mimetype application/pdf de
dc.language.iso eng de
dc.rights.uri http://webdoc.sub.gwdg.de/diss/copyrdiss.htm de
dc.title Controlled radical polymerization at pressures up to 2000 bar de
dc.type doctoralThesis de
dc.title.translated Kontrollierte radikalische Polymerization bis zu Drücken von 2000 bar de
dc.contributor.referee Hoyermann, Karlheinz Prof. Dr. de
dc.date.examination 2001-05-01 de
dc.subject.dnb 540 Chemie de
dc.description.abstracteng High-pressure controlled polymerizations of styrene and of butyl acrylate were successfully performed using different nitroxides as mediator. Narrow polydispersities and molecular weights close to the theoretical predictions are observed, irrespective of the applied pressure. High pressure allows for a significant enhancement of polymerization rate. High pressure also allows to carry out CRP at relatively low temperature and allows to produce high-molecular-weight material with narrow polydispersity. Rate coefficients were estimated by simulations using the software package PREDICI®. Attempts to control high-pressure ethene polymerization were not successful. Even at fairly high temperature, the dormant species will not readily dissociate. Further increase of temperature is associated with mediator decomposition and with a large enhancement of transfer to monomer reactions. Both effects exclude CRP. PREDICI® simulations and ab-initio calculations allow for the estimation of bond dissociation energies in alkoxyamines. It turns out that in several cases the N-O bond is less stable than the C-O bond which also destroys control of ethene polymerization. de
dc.subject.topic Mathematics and Computer Science de
dc.subject.ger Hochdruck de
dc.subject.ger Nitroxide de
dc.subject.ger Ethen de
dc.subject.ger TEMPO de
dc.subject.ger SG1 de
dc.subject.ger Styrol de
dc.subject.ger kontrollierte radikalische Polymerization de
dc.subject.eng high pressure de
dc.subject.eng nitroxide de
dc.subject.eng ethen de
dc.subject.eng TEMPO de
dc.subject.eng SG1 de
dc.subject.eng styrene de
dc.subject.eng controlled radical polymerization de
dc.subject.eng CRP de
dc.subject.bk 35.10 de
dc.identifier.urn urn:nbn:de:gbv:7-webdoc-1046-4 de
dc.identifier.purl webdoc-1046 de
dc.affiliation.institute Fakultät für Chemie de
dc.subject.gokfull SD de
dc.identifier.ppn 332430286

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