Di, 19.12.2017

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Rupert Schnell

Polymerforschung (Technology and Innovation) , Sabic, Bergen, Niederlande

Aging of Polycarbonate - Linking material science to real world problems

Abstract:
Polycarbonate is an extremely versatile material whenever toughness and transparency are required. Toughness of PC may deteriorate under thermal and chemical treatment. Thermal influence on PC is summarized as “aging”. After more than 60 years of commercial, use PC aging is still a subject of academic research and causing problems in application. Some examples of interesting PC performance, highlights in science and challenging applications will be shown.

Details
Rupert Schnell_PSM_19.12.2017.pdf (143,4 KB)  vom 15.12.2017

Di, 05.12.2017

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Dr. Georg Fytas

Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, Heraklion, Greece

"Controlling phonon propagation in architected soft matter"

Abstract:
Phononic crystals, i.e. composite materials in which a periodic distribution of elastic parameters facilitates control of the propagation of phonons, hold the promise to enable transformative material technologies in areas ranging from acoustic and thermal cloaking to thermoelectric devices. Realizing these opportunities requires strategies to deliberately ‘engineer’ the phononic band structure of materials in the frequency range of interest.

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Fytas_PSM_05.12.2017.pdf (171,8 KB)  vom 08.11.2017

Di, 28.11.2017

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Pieter Magusin

University of Cambridge, Institute of Chemistry, Cambridge, UK

"Ex Situ and In Situ NMR of Battery Materials"

Abstract:
Our group investigates novel electrode materials for lithium, sodium and magnesium ion batteries, and the solid electrolyte interface (SEI) formed on the anodes. Both ex situ and in situ NMR methods are employed, and it is the conjunction of these two approaches which yields the most useful and relevant information. ...

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Magusin_PSM_28.11.2017.pdf (149,8 KB)  vom 15.11.2017

Di, 21.11.2017

Prof. Dr. Andreas Schönhals

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Deutschland

"Structure-Property Relationships of Nanocomposite based on Polylactide and Layered Double Hydroxides as Nanofiller"

Abstract:
Polymer-based nanocomposites attracted recently a lot of attention from both the applicative and fundamental point of research. While the former point of view is due to the properties improvement compared to the corresponding matrix polymers the latter aspect is related to interaction of polymers with solid surfaces and confinement effects...

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Schönhals_PSM_21.11.2017.pdf (146,1 KB)  vom 18.09.2017

Di, 24.10.2017

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Felix Scheliga

Universität Hamburg, Institut für Technische und Makromolekulare Chemie, Hamburg, Deutschland

Polymer Characterization by Size Exclusion Chromatography: Manufacture and Applications

Abstract:
Since the early 1960´s SEC has become the most important tool for polymer characterization. Nowadays the molecular weight distribution of almost any dissolvable polymer can be obtained in a few minutes, whereas this task would have taken weeks or months before appropriate SEC columns were available.

Even though SEC has become a commonplace method, little is known about the how these SEC-materials are made. This talk is supposed to provide an overview on the manufacture of SEC gels and the various products on the market.

Details
Felix Scheliga_PSM_24.10.2017.pdf (143,6 KB)  vom 17.10.2017

Sonderveranstaltung:

Do, 26.10.2017

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Kerstin Blank

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

"Molecular Force Sensors: from molecular mechanisms towards applications in biology and materials science"

Abstract
Biological systems are highly sophisticated smart materials. They are stimuli-responsive and possess impressive self-reporting and self-healing properties. They are consequently an important source of inspiration for materials scientists who aim to implement these properties in synthetic and biomimetic materials. In this context, we are specifically interested in (bio)molecules that act as molecular force sensors...

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Blank_PSM_27.10.2017.pdf (145,7 KB)  vom 18.09.2017

Di, 17.10.2017

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. David M. Smith

Fraunhofer-Institut für Zelltherapie und Immunologie, DNA Nanodevices Gruppe, Leipzig, Deutschland

“Bottom-up Engineering of Nanoscale Devices to Program Macroscopic Material Properties"

Abstract
Biological materials are often used as inspiration in the design of new synthetic or bio-hybrid materials; however, the molecular toolbox provided by biological systems has been evolutionarily optimized to carry out the necessary functions of cells. The resulting inability to systematically modify fundamental properties such as polymer stiffness or the association strength of crosslinking proteins in experimentally available model systems hinders a meticulous examination of the connection between molecular parameter space and resulting properties of bulk assemblies. We circumvent these limitations using model systems based on synthetically produced building blocks such as DNA strands and peptides, which are programmable on the molecular scale.

In one example, micrometer-long nanotubes with tunable diameters and rigidity can be constructed from small sets of short, DNA oligonucleotides. By systematically varying the set of DNA strands of these synthetic, semiflexible filaments, their micron-scale persistence length (Lp) can be precisely tuned. [...]

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Smith_PSM_17_10_2017.pdf (111,7 KB)  vom 06.10.2017

12.07.17

14.15 Uhr im Seminarraum 1.26 Von-Seckendorff-Platz 1, 06120 Halle

Prof. Dr. Mark P. Taylor

Dept. of Physics, Hiram College, USA

Polymer folding in confined and crowded environments"

Abstract:
A flexible homopolymer chain with sufficiently short-range interactions undergoes a first-order-like transition from an expanded coil to a compact crystallite.  We have recently shown that this very simple model illustrates the underlying polymer physics leading to the distinct all-or-none folding thermodynamics characterizing many small proteins [1].  Here we investigate this polymer folding transition under geometric confinement and in the presence of macromolecular crowders...

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MP Taylor 12.07.2017.pdf (232,9 KB)  vom 05.07.2017

04.07.17

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Dr. Jutta Luettmer-Strathmann

University of Akron, Ohio, USA

“Investigation of sexithiophene properties with Monte Carlo simulations of a coarse-grained model"

Abstract:
Thiophenes have important applications in organic electronics, energy conversion, and storage. In this study, we focus on α-sexithiophene (α-6T), a small, π-conjugated molecule whose visible light absorption and high charge carrier mobility make it interesting for applications....

Details
Luettmer-Strathmann_PSM_04.07.2017.pdf (190,4 KB)  vom 23.05.2017

30.05.17

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Dr. Sabine Beuermann

Technische Universität Clausthal, Institut für Technische Chemie, Deutschland

“Inducing β phase crystallinity in poly(vinylidene fluoride) via synthetic strategies or nanoparticle formation"

Abstract:
Poly(vinylidene fluoride) (PVDF) shows 5 crystalline phases, with the β phase being associated with piezo, pyro- and ferroelectric properties. Since synthesis and processing of PVDF generally yields the α phase, special treatment is required to yield β phase material...

Details
Beuermann_PSM_30.05.2017.pdf (256,5 KB)  vom 23.05.2017

02.05.17

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. Martin Brehm

Martin-Luther-Universität Halle-Wittenberg, Halle, Deutschland

“The Balance of Interactions in Ionic Liquids"

Abstract:
As a newly emerging class of solvents with many promising properties, ionic liquids have received considerable attention during the last decade. These compounds can exhibit a certain degree of long-range ordering, or even microphase separation, despite of being liquids, which typically possess only local order....

Details
Brehm_PSM_02.05.2017.pdf (128,5 KB)  vom 18.04.2017

31.01.17

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. René Androsch

Institut für Polymerwerkstoffe e.V., An-Institut an der Hochschule Merseburg

“About the a'/a-crystal polymorphism of poly (L-lactic acid) (PLLA)”

Abstract:
Crystallization of the PLLA melt at temperatures higher than about 120 °C leads to formation of orthorhombic a-crystals while at lower temperatures, close to the glass transition, growth of pseudohexagonal, conformational disordered a’-crystals is favored. The a’-form is metastable...

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Androsch_PSM_31012017.pdf (344,2 KB)  vom 04.11.2016

24.01.17

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Prof. Sabine Ludwigs

Universität Stuttgart, Institut für Polymerchemie (IPOC), Lehrstuhl für Struktur und Eigenschaften polymerer Materialien

“Manipulation of Polymer Thin Films for Polymer Electronics & Electrochemical Devices”

Abstract:
The talk will give an overview about current activities of my research group on thin film manipulation of conjugated polymers. Recent research highlights include the tuning of aggregation of n-type semiconducting polymers via regioisomer control and the identification ...

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Ludwigs_PSM_24012017.pdf (231,2 KB)  vom 04.11.2016

17.01.17

17.15 Uhr im Seminarraum 1.27 Von-Danckelmann-Platz 4, 06120 Halle

Dr. habil. Costantino Creton

Soft Matter Science and Engineering Laboratory of the ESPCI ParisTech, France

“Mechanics of interpenetrated polymer networks”

Abstract:

We have been studying for a few years the mechanics of interpenetrated networks polymerized sequentially by swelling and polymerization steps. This strategy introduces a proportion of chains inside the material that are prestretched. When such materials are deformed the molecular strain becomes quite different from the macroscopic strain giving very interesting non-linear elastic properties and a 100 times higher fracture toughness. We will discuss how to optimize such properties and what are the molecular mechanisms leading to them.

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Creton_PSM_17.01.2017.pdf (230,1 KB)  vom 17.11.2016