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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...)



Determining Entanglement Molar Mass of Glassy Polyphenylenes Using Mechanochromic Molecular Springs

Maximilian Raisch, Günter Reiter, Michael Sommer. ACS Macro Lett. 2022, 11, 760–765

2022-sommer.jpgMolecular force transduction in tough and glassy poly(meta,meta,para-phenylene) (PmmpP) was investigated as a function of Mn using covalently incorporated mechanochromic donor–acceptor torsional springs based on an ortho-substituted diphenyldiketopyrrolopyrrole (oDPP). Blending oDPP-PmmpP probe chains with long PmmpP matrix chains allowed us to investigate molar-mass-dependent mechanochromic properties for a series of specimens having mechanically identical properties.(mehr...)



The memory of thin polymer films generated by spin coating

Günter Reiter, Farzad Ramezani, Jörg Baschnagel. EPJE 45 (2022) 51

2022-farzad.jpgWe present results from isothermal and temperature-sweep creep experiments adapted to filaments which were derived from spin coated and subsequently crumpled thin polystyrene films. Due to the existence of residual stresses induced by preparation, the filaments showed significant shrinkage which we followed as a function of time at various temperatures. In addition, the influence of preparation conditions and subsequent annealing of supported thin polymer films on shrinkage and relaxation behavior was investigated. The temporal evolution of shrinkage revealed a sequence of relaxation regimes. (mehr...)



Primary nucleation in metastable solutions of poly(3-hexylthiophene)

Tianyu Wu, Sivasurender Chandran, Yao Zhang, Tianze Zheng, Thomas Pfohl, Jun Xu, Günter Reiter. Macromolecules 55 (2022) 3325–3334

2022-tianyu.jpgDue to its smallness and low probability of formation, the determination of the size of the critical primary nucleus represents a great challenge in polymer crystallization. We are still missing a feasible approach providing experimental access to primary nucleation. In this work, we investigated the dependence of the incubation time on the degree of supersaturation for a well-defined metastable regime of a prototypical conjugated polymer, i.e., poly(3-hexylthiophene). Based on Kashchiev’s nucleation theorem and verified by a simulation model for primary nucleation based on the kinetics of attaching and detaching crystalline units, we deduced the number of crystalline units within the critical nucleus  [mehr...]

 

Liste der Veröffentlichungen

Continuous Fused Deposition Modelling of Architectural Envelopes Based on the Shell Formation of Molluscs: A Research Review
James H. Nebelsick, Christoph Allgaier, Benjamin Felbrich, Daniel Coupek, Renate Reiter, Günter Reiter, Achim Menges, Armin Lechler, Karl-Heinz Wurst. In book: Biomimetic Research for Architecture and Building Construction. Eds. Jan Knippers, Klaus Nickel, Thomas Speck. Springer 2016
Tunneling of charge carriers across a gold–squaraine interface
L.V. Govor, G. Reiter and J. Parisi, Physics Letters A 380 (2016) 1493–1498
Intrinsic Stresses in Thin Glassy Polymer Films Revealed by Crack Formation
Mithun Chowdhury, Xiaoyuan Sheng, Falko Ziebert, Arnold C.-M. Yang, Alessandro Sepe, Ullrich Steiner, and Günter Reiter. Macromolecules 49 (2016) 9060−9067
Revealing Order and Disorder in Films and Single Crystals of a Thiophene-Based Oligomer by Optical Spectroscopy
Sajedeh Motamen, Dominic Raithel, Richard Hildner, Khosrow Rahimi, Thibaut Jarrosson, Françoise Serein-Spirau, Laurent Simon, and Günter Reiter. ACS Photonics 3 (2016) 2315–2323
Poly(2,5-dioctylphenyl-3-thiophene) synthesized by direct arylation polycondensation: End groups, defects and crystallinity
Daniel Schiefer, Hartmut Komber, Fanuel Mugwanga Keheze, Susanna Kunz, Ralf Hanselmann, Guenter Reiter, Michael Sommer. Macromolecules 49 (2016) 7230-7237
Transient cooperative processes in dewetting polymer melts
Sivasurender Chandran, Günter Reiter, PRL 116 (2016) 088301
Crystallization and Resulting Optical Properties of Thiophene-Based Oligomers
Sajedeh Motamen. Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Mathematik und Physik der Universität Freiburg, 2016
Large area crystal surfaces of precisely sidebranched polyethylenes: Preparation, surface order and functionalization
Rainhard Machatschek. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Chemie und Pharmazie der Albert-Ludwigs-Universität Freiburg im Breisgau, 2016
Probing the Elasticity of Langmuir Polymer Films of High Molecular Weight Poly (γ-benzyl-L-glutamate)
Emna Khechine. Master Thesis im Studiengang M.Sc. Sustainable Materials, 2016
Self-assembled nanotubes and nanoribbons of aromatic diamide-esters
Asad Jamal. Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Mathematik und Physik der Universität Freiburg, 2016
Formation and Optical Characterization of Single Crystals of Poly(3-Hexylthiophene) (P3HT), a Model Conjugated Polymer
John O. Agumba. Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Mathematik und Physik der Universität Freiburg, 2016
History Dependent Temporal Changes of Properties of Thin Polymer Films
Günter Reiter. In: Non-equilibrium Phenomena in Confined Soft Matter. Ed. Simone Napolitano. Springer 2015
Consequences of a Single Double Bond within a Side-Group on the Ordering of Supra-Molecular Polymers
Roozbeh Shokri, Olga Guskova, Asad Jamal, Kaiwan Jahanshahi, Benjamin Isare, Laurent Bouteiller, Laurent Simon, Jens-Uwe Sommer, Günter Reiter. The Journal of Physical Chemistry, Part C 119 (2015) 22596–22603
Different surface sensing of the cell body and nucleus in healthy primary cells and in a cancerous cell line on nanogrooves
Patricia Davidson, Maxence Bigerelle, Günter Reiter and Karine Anselm. Biointerphases 10, 031004 (2015) / DOI: 10.1116/1.4927556
How Chain-Folding Crystal Growth Determines Thermodynamic Stability of Polymer Crystals
Xiaoming Jiang, Günter Reiter, Wenbing Hu. J. Phys. Chem. B, 120 (2016) 566–571
Stabilization of nuclei of lamellar polymer crystals: Insights from a comparison of the Hoffman-Weeks line with the crystallization line
Jun Xu, Barbara Heck, Hai-Mu Ye, Jing Jiang, Yi-Ren Tang, Jin Liu, Bao-Hua Guo, Renate Reiter, Dongshan Zhou, Günter Reiter. Macromolecules 49 (2016) 2206–2215
Role of Preparation Pathways and Tacticity on the Non-Equilibrium Dynamcis of Polystyrene Films
Rishab Handa. Master Thesis im Studiengang M.Sc. Sustainable Materials, 2016
Variation of the contact resistance with electric current for gold electrodes on a squaraine single crystal
Leonid Govor, Guenter Reiter, and Jurgen Parisi. Phys. Status Solidi A 212 (2015) 2738–2746, DOI 10.1002/pssa.201532241
Simulation of secondary nucleation of polymer crystallization via a model of microscopic kinetics
Kun-Lun Xu, Bao-Hua Guo, Renate Reiter, Günter Reiter, Jun Xu. Chinese Chemical Letters 26, 1105–1108 (2015) / DOI: 10.1016/j.cclet.2015.06.002
From holes to drops to toroids: Conditions for the transcription of surface patterns into three-dimensional morphologies via rim instabilities in the course of dewetting
Samer Al Akhrass, Laurent Vonna and Günter Reiter. In: Polymer Surfaces in Motion: Unconventional Patterning Methods, Eds. Juan Rodriguez-Hernandez and Carlos Drummond. Springer 2015
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