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By exploiting these properties, we succeeded in separately addressing nucleophilicity and basicity, thereby enabling different polymerization pathways.
Overall, as we found from experiments and calculations, NHOs are superbases and can also add to moderately activated double bonds.
Accordingly, we employ NHOs for the polymerization of epoxides, lactones, acrylic monomers and carbonates. See for example: R. Schuldt, J. Kästner, S.
A recent development in polymerization catalysis does not aspire to maximize the reactivity of, for example, the propagating chain end, but rather in opposite aims at employing propagating species with attenuated reactivity.
This is counterbalanced by in turn activating the monomer. The benefits are especially notable if one achieves to selectively activate the monomer, while the polymer chain itself remains largely unaffected.
To this end, my research activity has focused on developing simple, yet highly tunable catalyst pairings of Lewis bases organobases and Lewis acids for the ring-opening polymerization ROP of O -heterocyclic monomers.
Multiple benefits have resulted from this approach, including among others:. See for example: S. Naumann , P. Scholten, J. Wilson, A.
Wang Macromolecules , 49 , ; P. Walther, A. Krauss, S. Two very different polymerization pathways, namely organocatalytic, anionic polymerization and zwitterionic polymerization can be operated by application of NHO catalysis.
The different mechanisms have fundamental repercussions for the resulting polyethers. This mechanistic dualism opened up novel material applications for polyethers.
Very differently, the resulting UHMW-polymers from the zwitterionic approach i. The overall aim of my research regarding polyether formation is my conviction that, by perspective, polyethers can be developed into valuable performance polymers; to this end, a combination of advanced catalysis and process technology is necessary, encompassing not only control over molar mass and molar mass distribution, but also tacticity and degradability of the polyethers.
Thomas, A. Markus, J. Bruckner, S. This lactone can be bio-sourced and crucially, its thermodynamically favoured, almost strainless five-membered structure facilitates ready depolymerization by simple heating.
This typically occurs without any side products as demonstrated by Chen and co-workers, thus constituting an ideal candidate for a circular economy.
Our research therefore followed a two-pronged approach : developing more practicable ways to generate the homopolymer poly GBL and secondly copolymerizing GBL with other lactones to create tailored polyesters.
In this case, the dual catalytic methodology proved especially successful, allowing for the selective realization of different poly GBL architectures and for controlling GBL incorporation in copolymers by choice of the co-catalyzing Lewis acid.
See for example: P. Walther, S. Walther, W. Frey, S. In this context, I am PI of a project investigating the porous supports, focusing on carbon materials.
To this end, we employ an organic self-assembly process, using amphiphilic block copolyethers as structure directing agents.
Crucially, we employ our ability for precise polyether preparation see to in turn realize highly ordered carbon structures.
By fine-tuning the structure-directing polymers with regard to molar mass and hydrophilic-to-lipophilic balance, we aim to control the diameter of the generated mesopores.
We further aim to control the surface chemistry of the mesoporous material. Balint, M. Papendick, M. Clauss, C.
Start Institute Team Naumann, Stefan. Vogler, S. Naumann, RSC Adv. Altmann, M. Steinmann, G. Mourgas, I. Elser, M. Benedikter, S. Naumann, M. Buchmeiser, J.
Winnacker, S. Schindler, S. Walther, C. Naumann, Chem. Naumann, Macromol. Naumann, J. Clauss, S. König, E.
Frick-Delaittre, C. Koopmans, A. Wolf, S. Dove, H. Sardon and S. Naumann, Polym. Meisner, J. Karwounopoulos, P. Client Advisories. Legal comments: "Head of department Stefan Naumann has been commended for his excellent communication skills and ability to work easily in English" "The 'excellent' Stefan Naumann leads a strong IP practice…, offering excellent service in patent litigation as well as expertise in French and US copyright and trademark-related matters" "The responsive, sensitive and knowledgeable Stefan Naumann is a pleasure to work with" Chambers notes: "Lauded for his outstanding negotiation and litigation skills, Stefan Naumann… is the go-to lawyer for anti-piracy matters.
He is particularly active in the fields of pharmaceuticals, advertising, and motion picture production, distribution and merchandising".
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