Enzymkatalysierte Kondensationsreaktionen in wässrigen Miniemulsionen und radikalische Polymerisationen in ionischen Flüssigkeiten
In the present work the first results of the enzymatic esterification of aliphatic carbonic acids with primary and secondary alcohols in mini-emulsion are shown. The influence of the solubility of the alcohols and branched and therefore sterically demanding alcohols on the reaction rate and the maxi...
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Universität Ulm
2008
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ftunivulm:oai:null:123456789/1156 2024-09-15T18:01:41+00:00 Enzymkatalysierte Kondensationsreaktionen in wässrigen Miniemulsionen und radikalische Polymerisationen in ionischen Flüssigkeiten Schatzinger, Andreas 2008-04-24 application/pdf https://doi.org/10.18725/OPARU-1129 http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-63669 ger ger Universität Ulm http://dx.doi.org/10.18725/OPARU-1129 http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-63669 https://oparu.uni-ulm.de/xmlui/license_v1 Hydrolasen Lipoprotein-Lipase Esterification Carbonsäureester Enzym Ionische Flüssigkeit Kalorimetrie Kondensationsreaktion Miniemulsion Polyester Radikalische Polymerisation Veresterung doc-type:doctoralThesis Text 2008 ftunivulm https://doi.org/10.18725/OPARU-1129 2024-08-06T23:39:03Z In the present work the first results of the enzymatic esterification of aliphatic carbonic acids with primary and secondary alcohols in mini-emulsion are shown. The influence of the solubility of the alcohols and branched and therefore sterically demanding alcohols on the reaction rate and the maximum conversion of the esterification was determined. To state the efficiency of an enzyme catalyzed condensation reaction compared to an acid catalysed reaction in macro- and mini-emulsion the esterification reactions have been carried out in mini-emulsion as well as acid catalyzed and enzymatically. In addition to the esterification of carbonic acids with a primary alcohol, the attempt to synthesize a per-ester of a hydroperoxide and a carbonic acid was made. Besides the synthesis of simple esters lipases can be applied for the enzymatic synthesis of polyesters in aqueous mini-emulsions. Therefore lactones were used as monomers. For the first time the enzymatic reaction of e-caprolactone to poly((e-caprolactone) in an aqueous medium is described. To show the possibilities of lipase catalyzed reactions in ionic liquids, e-caprolactone has been chosen as a monomer and as a ionic liquid the water-soluble 3-ethyl-1-methylimidazolium tetrafluoroborate was used. In the second part of the present work new heterophase systems with ionic liquids were introduced. With ionic liquids as continuous phase, stable liquid/liquid heterophase systems without additional stabilizing agents like surfactants can be obtained. The radical polymerization in ionic liquids was analysed via calorimetry and the obtained results were compared with the results from preceding works regarding the kinetics of the radical polymerization in aqueous mini-emulsions. Doctoral or Postdoctoral Thesis Carbonic acid OPARU (OPen Access Repository of Ulm University) |
institution |
Open Polar |
collection |
OPARU (OPen Access Repository of Ulm University) |
op_collection_id |
ftunivulm |
language |
German |
topic |
Hydrolasen Lipoprotein-Lipase Esterification Carbonsäureester Enzym Ionische Flüssigkeit Kalorimetrie Kondensationsreaktion Miniemulsion Polyester Radikalische Polymerisation Veresterung |
spellingShingle |
Hydrolasen Lipoprotein-Lipase Esterification Carbonsäureester Enzym Ionische Flüssigkeit Kalorimetrie Kondensationsreaktion Miniemulsion Polyester Radikalische Polymerisation Veresterung Schatzinger, Andreas Enzymkatalysierte Kondensationsreaktionen in wässrigen Miniemulsionen und radikalische Polymerisationen in ionischen Flüssigkeiten |
topic_facet |
Hydrolasen Lipoprotein-Lipase Esterification Carbonsäureester Enzym Ionische Flüssigkeit Kalorimetrie Kondensationsreaktion Miniemulsion Polyester Radikalische Polymerisation Veresterung |
description |
In the present work the first results of the enzymatic esterification of aliphatic carbonic acids with primary and secondary alcohols in mini-emulsion are shown. The influence of the solubility of the alcohols and branched and therefore sterically demanding alcohols on the reaction rate and the maximum conversion of the esterification was determined. To state the efficiency of an enzyme catalyzed condensation reaction compared to an acid catalysed reaction in macro- and mini-emulsion the esterification reactions have been carried out in mini-emulsion as well as acid catalyzed and enzymatically. In addition to the esterification of carbonic acids with a primary alcohol, the attempt to synthesize a per-ester of a hydroperoxide and a carbonic acid was made. Besides the synthesis of simple esters lipases can be applied for the enzymatic synthesis of polyesters in aqueous mini-emulsions. Therefore lactones were used as monomers. For the first time the enzymatic reaction of e-caprolactone to poly((e-caprolactone) in an aqueous medium is described. To show the possibilities of lipase catalyzed reactions in ionic liquids, e-caprolactone has been chosen as a monomer and as a ionic liquid the water-soluble 3-ethyl-1-methylimidazolium tetrafluoroborate was used. In the second part of the present work new heterophase systems with ionic liquids were introduced. With ionic liquids as continuous phase, stable liquid/liquid heterophase systems without additional stabilizing agents like surfactants can be obtained. The radical polymerization in ionic liquids was analysed via calorimetry and the obtained results were compared with the results from preceding works regarding the kinetics of the radical polymerization in aqueous mini-emulsions. |
format |
Doctoral or Postdoctoral Thesis |
author |
Schatzinger, Andreas |
author_facet |
Schatzinger, Andreas |
author_sort |
Schatzinger, Andreas |
title |
Enzymkatalysierte Kondensationsreaktionen in wässrigen Miniemulsionen und radikalische Polymerisationen in ionischen Flüssigkeiten |
title_short |
Enzymkatalysierte Kondensationsreaktionen in wässrigen Miniemulsionen und radikalische Polymerisationen in ionischen Flüssigkeiten |
title_full |
Enzymkatalysierte Kondensationsreaktionen in wässrigen Miniemulsionen und radikalische Polymerisationen in ionischen Flüssigkeiten |
title_fullStr |
Enzymkatalysierte Kondensationsreaktionen in wässrigen Miniemulsionen und radikalische Polymerisationen in ionischen Flüssigkeiten |
title_full_unstemmed |
Enzymkatalysierte Kondensationsreaktionen in wässrigen Miniemulsionen und radikalische Polymerisationen in ionischen Flüssigkeiten |
title_sort |
enzymkatalysierte kondensationsreaktionen in wässrigen miniemulsionen und radikalische polymerisationen in ionischen flüssigkeiten |
publisher |
Universität Ulm |
publishDate |
2008 |
url |
https://doi.org/10.18725/OPARU-1129 http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-63669 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
http://dx.doi.org/10.18725/OPARU-1129 http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-63669 |
op_rights |
https://oparu.uni-ulm.de/xmlui/license_v1 |
op_doi |
https://doi.org/10.18725/OPARU-1129 |
_version_ |
1810438776277696512 |