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Neueste Veröffentlichungen

Nucleation Assisted through the Memory of a Polymer Melt: A Different Polymorph Emerging from the Melt of another One

Brahim Bessif, Barbara Heck, Thomas Pfohl, Cuong Minh Quoc Le, Abraham Chemtob, Valentina Pirela, Justine Elgoyhen, Radmila Tomovska, Alejandro Müller, Günter Reiter. Macromolecules 56 (2023) 1461–1470

ma2c02252.jpgWe present investigations of the intricate crystallization and melting behavior of an alternating copolymer synthesized by photopolymerization of 2,2’dimercaptodiethyl sulfide (DMDS) with di(ethylene glycol)divinyl ether (DVE). Upon increasing temperature, we observed the succession of two distinctly separated melting processes, which we related to the sequential formation and disappearance of two crystalline polymorphs. Due to their well separated melting temperatures and, we labelled these polymorphs as LOW--form and HIGH--form, respectively. X-ray diffraction results confirmed differences in the parameters of the crystal unit cells. (more...)

Reversible Dehydration-Hydration of Poly(ethylene glycol) in Langmuir Monolayers of a Diblock Copolymer Inferred from Changes in Filament Curvature

Emna Khechine, Sebastian Noack, Helmut Schlaad, Jun Xu, Günter Reiter, Renate Reiter. Langmuir 39 (2023) 2710–2718

la2c03179.jpgWe investigated changes in the hydration state of poly(ethylene glycol) through morphological changes in Langmuir monolayers of a poly(ethylene glycol)-poly(L-lactide) (PEG-b-PLLA) diblock copolymer. When the PEG blocks were hydrated, we observed a remarkable morphology of bundles of ring-like filaments, arranged concentrically, yielding densely packed disk-like objects with a hollow centre. We attribute the uniform curvature of these filaments to a strong mismatch between the molecular volumes occupied by PLLA blocks and hydrated PEG blocks, respectively. (more...)


In situ dissolution and swelling of confined lamellar polymer crystals through exposure to humid air

Brahim Bessif, Thomas Pfohl, Barbara Heck, Yaser Alshetwi, Emna Khechine, Jun Xu, and Günter Reiter. Macromolecules 55, 6015–6022, 2022

2022-brahim.jpgInduced by exposure to humid air, we observed in-situ the temporal and spatial changes in thickness and morphology of sandwich-like polymer platelets of a block copolymer. These micron-size platelets consisted of a crystalline poly(ethylene oxide) (PEO) lamella confined between two glassy poly(styrene) (PS) layers, formed via crystallization of a hydrophobic-hydrophilic PS-b-PEO diblock copolymer. We observed first the dissolution of the confined crystalline PEO layers characterized by sharp dissolution front propagating at a constant velocity as described by case II diffusion of a liquid into a solid. (mehr...)



Liste der Veröffentlichungen

Signatures of Melting and Recrystallization of a Bulky Substituted Poly(thiophene) Identified by Optical Spectroscopy
Fanuel Keheze, Dominic Raithel, Tianyu Wu, Daniel Schiefer, Michael Sommer, Richard Hildner, Günter Reiter. Macromolecules 50 (2017) 6829–6839
Triple-Shape Memory Materials via Thermoresponsive Behavior of Nanocrystalline Non-Isocyanate Polyhydroxyurethanes
Vitalij Schimpf, Barbara Heck, Günter Reiter, Rolf Mülhaupt. Macromolecules 50 (2017) 3598–3606
Semicrystalline long-chain polyphosphoesters from polyesterification
Hanna Busch, Sumit Majumder, Guenter Reiter, Stefan Mecking. Macromolecules 50 (2017) 2706–2713
Blocking of injected holes at the charge extracting interface
L. Govor, G. Reiter, J. Parisi. Journal of Physics, Condensed Matter 29 (2017) 025001
Relaxing Non-equilibrated Polymers in Thin Films at Temperatures Slightly Above the Glass Transition
Mithun Chowdhury, Samer Al Akhrass, Falko Ziebert, Günter Reiter. Journal of Polymer Science Part B: Polymer Physics 55 (2017) 515–523
Solvent-controlled reversible switching between adsorbed self-assembled nanoribbons and nanotubes
Asad Jamal, Irina Nyrkova, Philippe Mesini, Swann Militzer and Günter Reiter. Nanoscale 9 (2017) 3293-3303
Low Loss Optical Waveguiding in Large Single Crystals of Thiophene-Based Oligomers
Sajedeh Motamen, Christian Schörner, Dominic Raithel, Jean-Pierre Malval, Thibaut Jarrosson, Françoise Serein-Spirau, Laurent Simon, Richard Hildner, Günter Reiter. Physical Chemistry Chemical Physics 19 (2017) 15980 - 15987
Time Allowed for Equilibration Quantifies the Preparation Induced Non-equilibrium Behavior of Polymer Films
Sivasurender Chandran, Rishab Handa, Marwa Kchaou, Samer Al Akhrass, Alexander Semenov, Günter Reiter. ACS Macro Lett. 6 (2017) 1296-1300
A novel interferometric method for the study of the viscoelastic properties of ultra-thin polymer films determined from nanobubble inflation
P. Chapuis , P. C. Montgomery, F. Anstotz, A. Leong-Hoï, C. Gauthier, J. Baschnagel, G. Reiter, G. B. McKenna, and A. Rubin. Review of Scientific Instruments 88 (2017) 093901
Controlling Polymer Crystallization Kinetics by Sample History
Purushottam Poudel, Sivasurender Chandran, Sumit Majumder and Günter Reiter. Macromol. Chem. Phys. 2017, 1700315
Morphological Changes of Isotactic Polypropylene Crystals Grown in Thin Films
Bin Zhang, Jiajia Chen, Baochen Liu, Binghua Wang, Changyu Shen, Renate Reiter, Jingbo Chen, Günter Reiter. Macromolecules 50 (2017) 6210−6217
Soft electrostatic trapping in nanofluidics
Michael A. Gerspach, Nassir Mojarad, Deepika Sharma, Thomas Pfohl, and Yasin Ekinci. Microsystems & Nanoengineering (2017) 3, 17051
Live cell X-ray imaging of autophagic vacuoles formation and chromatin dynamics in fission yeast
N. Strelnikova, N. Sauter, M. Guizar-Sicairos, M. Göllner, A. Diaz, P. Delivani, M. Chacon, I. M. Tolić, V. Zaburdaev, T. Pfohl, Scientific Reports 7 (2017) 13775
Second messenger-mediated tactile response by a bacterial rotary motor
I. Hug, S. Deshpande, K. S. Sprecher, T. Pfohl, U. Jenal, Science 358 (2017) 531-534
Manipulating the dewetting dynamics of polymer films by creating non-equilibrium conformational states at the interface
Adrian Linn, Master Thesis 2017
Induziertes gerichtetes Kristallwachstum einer kristallisierbaren Polymerkomponente innerhalb eines nicht-kristallisierbaren Polymernetzwerks und Untersuchung der resultierenden mechanischen Energie
Stephan Laule. Inauguraldissertation 2017
Self-Assembly and Polymerization of Diacetylene Molecules on Epitaxial Graphene
Fallou Fall, Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Mathematik und Physik der Universität Freiburg, 2017
Vesicle Origami and the Influence of Cholesterol on Lipid Packing
Radu Tanasescu, Martin A. Lanz, Dennis Mueller, Stephanie Tassler, Takashi Ishikawa, Renate Reiter, Gerald Brezesinski, and Andreas Zumbuehl. Langmuir 32 (2016) 4896−4903
Self-assembly behavior of a rod-like polypeptide at the air-water interface
Renate Reiter, Frédéric Wintzenrieth, Günter Reiter. Polymer 107 (2016) 379–386
Covalent Functionalization by Cycloaddition Reactions of Pristine Defect-Free Graphene
L. Daukiya, C. Mattioli, D. Aubel, S. Hajjar-Garreau, F. Vonau, E.Denys, G. Reiter, J. Fransson, E. Perrin, M-L. Bocquet, C. Bena, A. Gourdon, and L. Simon. ACS Nano 11 (2017) 627–634
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