Seminar: Aktuelle Themen der Polymerforschung

Die, 21.10.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Dr. Christian Sonnendecker

ESTER Biotech GmbH, Universität Leipzig

Nature Strikes Back: Unleashing Hydrolases to Reshape the Future of Plastics

Plastics were built to outlast nature. But nature is catching up. Engineered hydrolases now dismantle polymers like PET with surprising efficiency, turning waste into resources and challenging the fossil-based status quo. This talk will showcase how protein engineering, high-throughput testing, and smart process design can transform plastic waste into a circular opportunity – proving that enzymes are no longer just a curiosity, but a game-changer.

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Die, 08.07.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Dr. André Gröschel

Universität Bayreuth

Polymer cubosomes: From degradable delivery platforms to hybrid materials for batteries

Polymer cubosomes are a relatively new class of self-assembled microparticles of block copolymers that are open porous, have large interfacial area, and carry functional groups on surface and inside the cubosome wall. In this presentation, I will give a brief overview of recent discoveries in this field and summarize also our efforts in designing polymer cubosomes with controlled shape, dimension, and chemistry. Currently, we focus on the synthesis of functional cubosomes, develop routes for their formation, and explore diverse applications including degradable mesoporous particles for agrochemistry, templating of high surface area materials, and components for batteries.

Die, 01.07.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Holger Frauenrath

EPFL, Lausanne (Schweiz)

Supramolecular Modification of High-Molar-Mass Sustainable Polymers

The plastic waste crisis has driven interest in sustainable polymers, but these alternatives often fall short in processing and performance. Our lab developed a strategy to modify high-molar-mass polymers using end groups that co-assemble with low-molar-mass additives via multivalent hydrogen bonding. This creates bio-inspired nanofibrillar structures that enhance melt strength, extensibility, and crystallization. The approach improves both processing and solid-state properties, is broadly applicable, and scalable—offering new potential for sustainable plastic alternatives.

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Meeting-Kennnummer: 2794 288 6429
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Die, 24.06.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Wolfgang Parak

Universität Hamburg

Polymers and nanoparticles combined for delivery

Polymers, (inorganic) nanoparticles, and biological molecules can be combined to multifunctional units. Two points will be addressed in particular. First, by integrating nanoparticles in biodegradable polymer matrices the size of the resulting particles can be designed to vary over time. Consequences for endo- and exocytosis will be discussed. Second, polymers can be used for the encapsulation of enzymes. In this way transport of the enzymes into cells is possible via endocytosis. Applications of such internalized enzymes will be discussed.

https://uni-halle.webex.com/uni-halle/j.php?MTID=mf10fb91f4a5d2226002516b54556e9ab

Meeting-Kennnummer: 2794 288 6429
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Die, 17.06.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Dr. Holger Frey

Johannes Gutenberg-Universität Mainz

Isomerization of poly(ethylene glycol) to rPEG: Non-immunogenic, biocompatible and non-crystalline polyethers

Polyethylene glycol (PEG) is the gold standard in pharmaceutical and nanomedicine applications based on its chemical inertness, biocompatibility, and unique stealth properties. PEGylation, the conjugation of poly(ethylene glycol) (PEG) to bioactive peptide drugs or nanocarriers, is a key strategy in nanomedicine. However, recent studies have demonstrated that PEGylated therapeutics may induce severe side effects, linked to the formation of anti-PEG antibodies. This can result in complement-activated pseudo allergic reactions and accelerated blood clearance.

We introduce the randomized PEG (rPEG) technology designed to strongly reduce the antigenicity of PEG while preserving its pharmaceutical core benefits. This conceptually novel approach is based on an ideally random introduction of hydrophilic side chains along the PEG backbone via copolymerization. The rPEG strategy also gives access to non-crystalline PEG-like materials for a broad range of biomedical materials. The approach can rely on existing PEG technology at every stage, allowing for the use of established GMP manufacturing processes and supply chains. rPEG is conveniently copolymerized with lactide to PLA-based materials with elastic properties for biomedical application. In addition, rPEG leads to interesting Li-ion conducting structures.

Die, 10.06.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Philipp Seib

Friedrich-Schiller-Universität Jena

The Pharma-Silk-ceutics Paradigm

Silk is emerging as a valuable biopolymer for biomedical applications because of its unique and highly versatile structure and its robust clinical track record in human medicine. Silk can be processed into many material formats, including physically and chemically cross-linked hydrogels, nanoparticles and scaffolds that have almost limitless applications ranging from tissue engineering to biomedical imaging and sensing. This presentation provides a background on silk and will cover drug and stem cell delivery using selected silk formats.

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Die, 03.06.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Dr. Andreas Klingler

Leibniz-Institut für Verbundwerkstoffe GmbH, Kaiserslautern

Thermo-optical insights into the thermo-mechanical behaviour of dynamic polymer networks

Vitrimers, or more generally dynamic polymer networks, can reversibly change their phase state from a viscoelastic network structure with eternal character to a flowable state. This often temperature-controlled property transition is of particular interest, as it imparts certain reshaping and repair capabilities to these materials despite their covalent network bonds. However, the clarification and classification of the necessarily occurring phase transition from a viscoelastic solid to a flowable state due to dynamic covalent bond exchange requires further attention, as a correspondingly characteristic anomaly remains hidden in classical susceptibilities, such as the specific heat capacity.

In this talk, the phase transition behaviour of dynamic polymer networks will be first discussed from the perspective of dynamic thermal volume expansion. Since this property directly couples to the anharmonic molecular interaction potential, it is particularly suitable for studying solid-liquid phase and glass transitions. The rather new method of temperature-modulated optical refractometry (TMOR) used for this purpose provides simultaneously indirect insights into another key indicator for phase transitions: the shear relaxation behaviour.

Using selected model vitrimer systems, this coupled perspective of dynamic thermal volume expansion and shear relaxation will be discussed with regard to the property profile and the phase transition behaviour of dynamic polymer networks.

In Zusammenarbeit mit AgriPoly II

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Meeting-Kennnummer: 2794 288 6429
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Die, 27.05.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Birgit Strodel

Heinrich-Heine-Universität Düsseldorf und Forschungszentrum Jülich GmbH

Simulating Peptide Polymerization and PET Depolymerization

In my research group, we utilize simulation techniques covering different length and time scales —including atomistic classical molecular dynamics (MD) simulations, coarse-grained models, and QM/MM simulations—to explore the self-assembly of peptides and the breakdown of polyethylene terephthalate (PET). This talk will demonstrate how all-atom MD simulations uncover the aggregation tendencies of peptides, aiding in the design of peptides with tailored aggregation properties. For PET, I will showcase how MD simulations examine the adsorption of PET-hydrolyzing enzymes on amorphous and crystalline surfaces, highlighting key residues involved in adsorption and subsequent PET interaction within the active site. Our findings, confirmed by follow-up mutation studies, suggest alternative amino acids to enhance productive PET adsorption.

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Die, 06.05.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Laura Hartmann

Universität Freiburg

Sequence-defined glycopolymers for biomedical applications

Carbohydrates are an important part of our nutrition, they are used as materials e.g., cellulose or chitin, but they are also highly relevant in mediating various biological interactions, for example in cell-cell communication, immune responses and tumor growth. From a chemical point-of-view, carbohydrates are a highly diverse class of biomacromolecules using a great number of different building blocks that are assembled into linear and branched structures, oligomers, polymers and glycoconjugates. Intentionally reducing this complexity while maintaining the biological activity is achieved for so-called multivalent glycomimetics via the attachment of smaller glycan fragments onto synthetic scaffolds.

We have previously introduced sequence-defined glycopolymers as multivalent glycomimetics that can be precisely varied in terms of their scaffold structure, composition as well as number and kind of glycan fragment attached, parameters known to affect ligand properties such as avidity and binding specificity. In order to mimic the structural diversity of carbohydrates, these glycomacromolecules can then be used again as building blocks to create more complex glycomimetic structures and materials, e.g., through conjugation onto nanoparticles or proteins. The lecture will present the bottom-up synthesis of such glycopolymers and glycomimetic materials and will discuss their potential biomedical applications for example in inhibiting viral and bacterial infections.

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Die, 29.04.2025

16:15 Uhr im Seminarraum 5.10 Von-Seckendorff-Platz 1, 06120 Halle

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Dr. Ceren Kimna

Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH)

Advanced Performance Evaluation Tools for Nanoparticles in Drug Delivery

A major challenge in the development of nanoparticles for targeted drug delivery is the  lack of high-resolution tools to track their whole-body biodistribution with sufficient  sensitivity. Conventional methods primarily detect nanoparticles that accumulate at  high concentrations in major organs, overlooking promising formulations and limiting the  rational design of advanced delivery systems. Critically, low-resolution techniques also  fail to detect minor off-target populations—one of the leading causes of failure in clinical  translation.

In this talk, I will introduce SCP-nano, a high-sensitivity pipeline capable of detecting  nanocarriers—including lipid nanoparticles, liposomes, and polyplexes—down to  0.0005 mg mRNA/kg in mice. This approach enables an unbiased, quantitative  assessment of nanoparticle distribution and protein expression in wild-type animals,  providing precise insights into tissue- and cell-specific targeting. I will discuss how  integrating whole-body biodistribution data with nanoparticle design can enhance  precision drug delivery, reduce the need for exhaustive animal use, and accelerate  clinical translation timelines.

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Die, 22.04.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Ranjita Bose

Reichsuniversität Groningen (Niederlande)

Chemical vapor deposition of polymers for sustainable, biomedical and energy applications

Chemical vapor deposition (CVD) is a well-known technique for the synthesis of inorganic coatings and thin films. Milder variants, such as initiated CVD (iCVD) and oxidative CVD (oCVD), enable the synthesis of organic polymers. In these processes, a monomer and an initiator or oxidant are introduced into a vacuum reactor in the vapor phase, leading to a solvent-free, one-step, surface polymerization. These techniques deposit polymer films on delicate or porous substrates, ensuring high coating conformality.

We have used iCVD to develop materials with tunable and gradient mechanical stiffness. Bifunctional monomers like allyl methacrylate enable thermal radical initiation while preserving one functionality for UV crosslinking, creating stiffness gradients. This makes the materials suitable for implantable scaffolds requiring tunable mechanical properties. We also explore sustainable applications such as using bio-based monomers and recyclable adhesives.

Additionally, we synthesized polypyrrole using oCVD, integrating polymer synthesis, doping, and film formation in a single step. By optimizing deposition temperature, reactor pressure, and oxidant-to-monomer ratio, we achieved homogeneous polypyrrole films high conductivity of 180 S cm⁻¹ for a solvent-free method. These polymers were applied to sensors and energy storage. For piezoresistive strain sensors, polypyrrole was coated onto flexible, porous substrates like electrospun fiber mats, phase-separated hydrogel membranes, and 3D-printed lattices, allowing tunable mechanical and electrical properties. Results on strain sensing behavior, gauge factors, and cyclic stability will be presented. For electrochemical energy storage, polypyrrole was coated on a carbon fiber mat and characterized via cyclic voltammetry, galvanostatic charge-discharge, and thermal stability tests.

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Die, 08.04.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Dieter Jendrossek

Universität Stuttgart

Enzymatic cleavage of the carbon backbone in natural rubber and chemosynthetic hydrocarbon polymers

Natural rubber [poly(cis-1,4-isoprene)] is produced in annual quantities of ≈107 tons by cultivating the rubber tree (Hevea brasiliensis) by more than 100 years. The material – after chemical modification (vulcanization) – is used for numerous purposes and is present e. g. in tires, sealings, rubber clothes, latex gloves, condoms and many other items. As a natural material, rubber is biodegradable to water and carbon dioxide. Biodegradation of polyisoprene is initiated by microbial rubber oxygenases that oxidatively cleave the polyisoprene C=C-bonds yielding low molecular products. I will describe the properties of rubber oxygenases at the example of rubber oxygenase A (RoxA). In the second part, I will comment on the persuasiveness of the rapidly expanding research field of biodegradation of polyethylene (PE) and related hydrocarbon polymers (PP, PVC).

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Mon, 17.02.2025 - Sondertermin

11:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Antonia Statt

University of Illinois at Urbana-Champaign (USA)

Computational Design and Simulations of Soft Matter: From Molecular Insights to Functional Materials

This talk will first focus on the molecular inverse design of sequence-defined macromolecules for complex self-assembled disordered large-scale aggregates. By combining large-scale molecular dynamics simulations of simple models and machine learning, we identify monomer sequences that enable the design of precise target morphologies, such as drug delivery vesicles or micelles. The second topic addresses the morphology of hybrid lipid block-copolymer bilayers, offering new insights for the design of artificial membranes, transmembrane proteins, and interactions of nanoplastics with membranes.

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Die, 21.01.2025

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Konrad Tiefenbacher

Universität Basel

Catalysis inside a supramolecular capsule

My group is interested in exploring catalysis inside supramolecular containers. Our main focus has been the hexameric resorcin[4]arene capsule, originally reported by the Atwood group.1 It has served us as a reliable catalyst for a variety of acid-catalyzed cationic reactions ranging from simple acetal hydrolysis to more complex iminium catalysis and terpene cyclizations. Investigations revealed that related molecular capsules are not competent in these reactions. The most recent results concerning terpene cyclizations will be presented.2,3 Furthermore, very recent published, as well as unpublished, results concerning stereoselective glycosylations inside the hexameric resorcin[4]arene capsule will be discussed.4 A unusual proton wire mechanism is likely at work. developed.

1.    L. R. MacGillivray, J. L. Atwood Nature 1997, 389, 469.
2.    L.-D. Syntrivanis, I. Némethová, D. Schmid, S. Levi, A. Prescimone, F. Bissegger, D. T. Major, K. Tiefenbacher J. Am. Chem. Soc. 2020, 142, 5894.
3.     I. Némethová, D. Schmid, K. Tiefenbacher Angew. Chem. Int. Ed. 2023, e202218625.
4.     T-R. Li, F. Huck, GM. Piccini, K. Tiefenbacher Nat. Chem. 2022, 14, 985.

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Di, 07.01.2025 - Abgesagt

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Dr. Chien-Hua Tu

University of Pennsylvania, USA

(Non-)Equilibrium polymer chain behaviors in bulk and under nanoconfinement by dielectric spectroscopy

Dielectric spectroscopy (DS) alongside various microscopy techniques (e.g., AFM, SEM) has been used to study (non-)equilibrium polymer dynamics in bulk and under nanoconfinement. I will show recent findings to uncover the coupling-decoupling dynamics between slow main-chain backbone motions and fast side-group sticker motions across the glass transition temperature in an upcycled associating polymer, and demonstrate novel insights into the polymer imbibition within nanopores via self-developed nanofluidic DS technique, so called in situ nanodielectric spectroscopy (nDS). The critical role of chain adsorption during polymer imbibition has been elucidated.

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Mon, 16.12.2024

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Stefan Schiller

Goethe-Universität Frankfurt am Main

Proteins as precision macromolecules in the design of supramolecular architectures and adaptive materials for applications ranging from life-sciences to biomedical “soft robotics”

Biomimetic approaches provide multifunctional solutions in life-sciences and technical applications. Biomacromolecules, especially proteins, constitute high-performance materials, such as spider silk, mussel foot proteins, elastin, collagen and resilin, providing impressive functions throughout nature. Combining properties from elastin and resilin, the almost perfect elastic material in grasshopper joints, endow biomaterials with long-lasting elastic properties and strength. The grasshopper joint hybrid-protein resilin exhibits almost perfect elasticity with the highest resilience (>98%) of any known material^[1], outperforming known man-made materials.

We mimic these proteins by redesigning partial sequences of them, designing peptide-repeating units enabling the formation of e.g. block-domain biomacromolecules similar to block-copolymers. The biotechnological productions of these biomacromolecules allows for their scalable and sustainable production. The precise molecular design/composition of these repetitive protein-macromolecules in combination with controlled amphiphilicity, can also provide specific properties via the design of hydrophilic and hydrophobic domains facilitating the constitution of supramolecular architectures. These domains are mainly composed of repetitive sequences of matrix-protein partial sequences based on elastin-like protein (ELP) motives.^[2] They do not only allow for controlled amphiphilic properties, but also provide stimulus-responsive changes of molecular interactions allowing for the formation of adjustable supramolecular architectures^[3]. Novel programmed interaction schemes with different biomolecules^[4] and protocellular synthesis platforms/artificial cells, are shown^[5]. Furthermore, we expand the range of synthetic macromolecules and natural or modified biomacromolecules to imitate tissues and muscular systems. The design of artificial muscles, exerting rhythmic autonomous movements via nonequilibrium states driven by chemically fueled pH oscillation reactions, is demonstrated. The results also show how directional movements can be independently triggered by changes in pH and temperature including a selective on-switch and a combination of nonequilibrium states enabling “learning and oblivion”-like material effects. This paves the road for the next generation of autonomous materials in pharmacy, soft robotics and living matter.

In sum the presented precision biomacromolecules provide advanced supramolecular architectures for important applications in various disciplines using adaptive materials towards smart soft robotics and tissue mimicry, pharmacy and medicine.

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Die, 03.12.2024

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Dr. Felix Löffler

Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Potsdam

Additive chemical nanomanufacturing

3D printing technologies have revolutionized manufacturing, enabling highly customized polymer structures. Building on this, we aim to extend such customization to chemical synthesis. We have developed a laser-based additive polymer printing technology, incorporating various chemical building blocks and post-synthesis chemical modifications. This technology enables flexible parallel chemical synthesis, surface functionalization, and biomedical screening applications [1, 2]. Using our platform, we achieve targeted material synthesis, such as defined metal oxide and perovskite nanoparticles [3, 4], as well as fluorescent carbon nanodots [5]. This additive chemical nanomanufacturing process opens pathways for designing nanomaterials and functional nanodevices, including those for anti-counterfeiting [6].

[1] Adv Mater 2022, 34, 2108493
[2] Adv Mater 2022, 34, 2200359
[3] Nat Commun 2021, 12, 3224
[4] Adv Mater 2024, 2409592
[5] Nat Nanotechnol 2023, 18, 1027–1035
[6] Nat Commun 2024, 15, 1040

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Die, 26.11.2024 - Abgesagt

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. André Gröschel

Universität Bayreuth

Polymer cubosomes: From degradable delivery platforms to hybrid materials for batteries

Polymer cubosomes are a relatively new class of self-assembled microparticles of block copolymers that are open porous, have large interfacial area, and carry functional groups on surface and inside the cubosome wall. In this presentation, I will give a brief overview of recent discoveries in this field and summarize also our efforts in designing polymer cubosomes with controlled shape, dimension, and chemistry. Currently, we focus on the synthesis of functional cubosomes, develop routes for their formation, and explore diverse applications including degradable mesoporous particles for agrochemistry, templating of high surface area materials, and components for batteries.

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Die, 19.11.2024

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Prof. Dr. Markus Retsch

Universität Bayreuth

Thermal transport and heat management in self-assembled materials

Thermal transport can be significantly influenced by the presence of nano- and mesostructures and the interfaces that exist in such materials. This structuring can be employed to realize super-insulation properties as well as efficient heat spreading. Consequently, nanoscale thermal transport has attracted a lot of research interest for the past 20 years. Furthermore, (colloidal) mesostructures play a pivotal role in light-matter interaction, covering a broad spectral range from ultra-violet to mid-infrared. Thus, solar radiance scattering and thermal radiation emission can be tuned towards passive radiative daytime cooling.

In this presentation, I will provide an overview of heat transport and heat management in mesostructured materials. Based on anisotropically structured materials on different length scales and dimensionalities I will highlight the vast possibilities to control the temperature distribution for various applications. Order and disorder further contribute to thermal transport pathways and scattering of light. Colloidal mixtures of distinct compositions are well-suited model systems to systematically unravel their role in heat management. Finally, we have a strong interest in materials with a gradient structure. I will demonstrate various pathways to access gradually structured materials and how they can be employed for optical engineering and switchable temperature gradients.

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Die, 12.11.2024

16:15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

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Dr. Friederike Adams

Universität Stuttgart

Unlocking the Potential of Yttrium Catalysis: Functional Copolymers for Advanced Applications

Due to their impressive diversity, the application horizon of thermoplastics is extending far beyond the use as ordinary consumer goods. With the shift from commodity plastics to polymers used in high-tech applications, the precise tuning and modification of these materials is a key requirement. Therefore, the optimization of polymerization catalysts plays a significant role in modern polymer chemistry to efficiently produce different polymer architectures and microstructures for fine-tuning of material properties. Well-investigated yttrium complexes can act as highly active catalysts in two different coordination polymerization types: Ring-opening polymerization (ROP) of lactones and group-transfer polymerization (GTP) of Michael-type vinyl monomers. Modifications of the complexes were carried out to improve catalytic activity and enable the synthesis of functional block copolymers with diverse end-groups. The development of these new polymers addresses several key areas of modern polymer chemistry, including biobased materials, stimuli-responsive properties, and amphiphilic polymers for drug and nucleic acid delivery applications.

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