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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

Determining the maximum melting temperature of polymer crystals from a change in morphology of dewetting rims
Gang Wang, Guotao Shi, Anchenyi Yang, Binghua Wang, Changyu Shen, Jingbo Chen, Günter Reiter, Bin Zhang. Polymer 274 (2023) 125874
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
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
Improving the order of crystalline regions of poly(3-hexylthiophene) by crystallization from the self-nucleation domains
Mina Alizadehaghdam, Farhang Abbasia, and Günter Reiter. Thermochimica Acta 717 (2022) 179352
Determining Entanglement Molar Mass of Glassy Polyphenylenes Using Mechanochromic Molecular Springs
Maximilian Raisch, Günter Reiter, Michael Sommer. ACS Macro Lett. 11, 760–765, 2022
Editorial on the Special Topic “Polymer Crystallization”
Jun Xu, Günter Reiter, and Rufina G. Alamo. Crystals 12, 618 (2022)
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
The memory of thin polymer films generated by spin coating
Günter Reiter, Farzad Ramezani, Jörg Baschnagel. EPJE 45 (2022) 51
Bacteria-on-a-bead: probing the hydrodynamic interplay of dynamic cell appendages during cell separation
Nora Sauter, Matteo Sangermani, Isabelle Hug, Urs Jenal, and Thomas Pfohl. Biology Communications 5 (2022) 1093
Illumination of a Conjugated Polymer with Visible Light to Control Crystallization and Enhance Photoluminescence
Yaser AlShetwi. Inaugural-Dissertation zur Erlangung des Doktorgrads der Fakultät für Chemie und Pharmazie, 2022
Semi-crystalline poly(thioether) prepared by visible-light-induced organocatalyzed thiol-ene polymerization in emulsion
Cuong Minh Quoc Le, Gautier Schrodj, Ibrahima Ndao, Brahim Bessif, Barbara Heck, Thomas Pfohl, Günter Reiter, Justine Elgoyen, Radmila Tomovaska and Abraham Chemtob. Macromol. Rapid Commun. 43 (2022) 2100740
Illumination of Conjugated Polymers Reduces Nucleation Probability and Slows Down Crystal Growth Rate
Yaser AlShetwi, Brahim Bessif, Michael Sommer, Günter Reiter. Macromolecules 54, 2021, 11478–11485
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
An investigation on the heat dissipation in Zn-substituted magnetite nanoparticles, coated with citric acid and pluronic F127 for hyperthermia application
Sara Shatooti, Morteza Mozaffari, Günter Reiter, Diana Zahn, Silvio Dutz. Physica B: Physics of Condensed Matter 625 (2022) 41346856
Successive melting and crystallization of poly(3-hexylthiophene) in the melt-memory domain versus isotropic melt domain
Mina Alizadehaghdam, Farhang Abbasi, Günter Reiter. Journal of Materials Science 56 (2021) 19723–19737
Heat dissipation in Sm3+ and Zn2+ co-substituted magnetite (Zn0.1SmxFe2.9-xO4) nanoparticles coated with citric acid and pluronic F127 for hyperthermia application
S. Shatooti, M. Mozaffari, G. Reiter, D. Zahn, S. Dutz. Scientific Reports 11 (2021) 16795
Controlled Switching from the Growth of Mono-Lamellar Polymer Crystals to the Formation of Stacks of Uniquely Oriented Lamellae
Weixiang Chen, Brahim Bessif, Renate Reiter, Jun Xu, Günter Reiter. Macromolecules 54 (2021) 8135–8142
Self-Seeding Procedure for Obtaining Stacked Block Copolymer Lamellar Crystals in Solution
Brahim Bessif, Thomas Pfohl and Günter Reiter. Polymers 13 (2021) 1676
Non-equilibrium Properties of Thin Polymer Films
Sivasurender Chandran, Günter Reiter. In Matyjaszewski et al. (Eds.): Macromolecular Engineering: From Precise Synthesis to Macroscopic Materials and Applications, 4 Volumes, 2nd ed. Edition, Wiley-VCH Verlag GmbH, 2022. ISBN 9783527344550
Concepts of nucleation in polymer crystallization
Jun Xu, Günter Reiter, Rufina G. Alamo. Crystals 11 (2021) 304
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