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Neueste Veröffentlichungen
The size of critical secondary nuclei of polymer crystals does not depend on supersaturation
Yang Liu, Zhiqi Wang, Yao Zhang, Tianyu Wu, Tianze Zheng, Bao Hua Guo, Günter Reiter, Jun Xu. Nature Communications 16 (2025) 3773
It is still a great challenge to determine the size of critical nuclei, which is crucial for a comprehensive understanding of crystallization and for testing the controversial crystallization theories. Here, we propose a method to determine the size of critical secondary nuclei on growth faces of poly(butylene succinate) single crystals in solution, basing on the probability of statistically selecting crystallizable units in random copolymers. In a dilute solution and for a given crystallization temperature, we reveal that the size of critical secondary nuclei was independent of supersaturation, contrary to the well-accepted prediction of existing theories which expect that the size of the critical nucleus increases with decreasing supersaturation. Accounting correctly for the dilution-caused change in the steady-state concentration of clusters of various sizes, we remedy inconsistencies of existing theoretical approaches in deriving the correct size of critical secondary nuclei in solution being independent of supersaturation. (more...)
Binghua Wang, Hailong Zou, Xuchen Wang, Changyu Shen, Jingbo Chen, Günter Reiter, Bin Zhang. Nature Communications 16 (2025) 3275
The dissolution of polymer crystals often proceeds at rates varying in time and space. Here, using low molecular weight poly(ethylene oxide) as a model polymer, we exploit step-wise selective dissolution for unveiling how spatial variations in metastability are generated during the growth of lamellar polymer single crystals. The dissolution velocity along defined crystal faces is constant, but ca. 5 times faster for rough than for smooth faces. From the temperature dependence of dissolution, we derive detachment energies of 420 ± 40 kJ/mol and 650 ± 50 kJ/mol for rough and smooth faces, respectively, suggesting that on a rough face polymer chains have ca. 1/3 less neighboring molecules to interact with. The observed high values of the activation energy indicate that, for dissolving a polymer crystal, the progressive detachment of whole chains is indispensable. Our study reveals a strong relation between growth kinetics and the resulting metastability of polymer crystals. (more...)
Baode Zhang, Snežana D. Zarić, Sonja S. Zrilić, Iosif Gofman, Barbara Heck, Günter Reiter. Communications Chemistry 8 (2025) 21
The interplay between attractive London dispersion forces and steric effects due to repulsive forces resulting from the Pauli principle often determines the geometry and stability of nanostructures. Aromatic polyimides (PI) and carbon nanotubes (CNT) were chosen as building blocks as two components in the hetero delocalized electron nanostructures. Two PIs, having the same diamine part and different linkage substituents between two phenyl rings of dianhydride part, one linked with ether bond (C-O-C) (OPI), the other with C-(CF3)2 (FPI), were investigated. Surprisingly, two CNT/PI nanocomposites show distinct failure mode from CNT yielding to CNT pull-out failure. Calculation of the interaction energy and chain conformations of each PI upon CNT was performed by accurate density functional theory (DFT) calculations and molecular dynamic simulation (MDS). (more...)
Valentina Pirela, Leire Unanue, Justine Elgoyhen, Javier Ramos, Juan Francisco Vega, Agurtzane Mugica, Manuela Zubitur, Cuong Minh Quoc Le, Abraham Chemtob, Radmila Tomovska, Günter Reiter, Jaime Martín, Alejandro J. Müller. European Polymer Journal (2025) 113721
This work studies how the chemical structure of relatively similar high-sulfur alternating polythioether homopolymers (DMDS-alt-DVE, DMDS-alt-TEGDVE, and DMDS-alt-BDDVE) affects their structural properties, morphology, polymorphism, and crystallization kinetics. Differential scanning calorimetry (DSC) and polarized light optical microscopy (PLOM) experiments revealed a complex crystallization for the samples in which up to three different polymorphic phases were identified: a very low melting crystal form (VL-Tm form), a low melting crystal form (L-Tm form) and a high melting crystal form (H-Tm form), characterized by their corresponding melting temperature ranges and confirmed via Wide-Angle X-ray Scattering (WAXS). A coexistence of negative and positive spherulites was found, and their origin was revealed by atomic force microscopy (AFM), which showed how the lamellar arrangement varied in the samples from predominantly radial to a cross-hatched morphology. (more...)
Liste der Veröffentlichungen
- The role of co-units in polymer crystallization and melting: New insights from studies on syndiotactic poly(propene-co-octene)
- G. Hauser, J. Schmidtke, G. Strobl. Macromolecules 31, 6250-6258 (1998)
- Synthesis and microphase separation of diblock copolymers of styrene and p-chlorostyrene prepared by using N-oxyl capped macroinitiators
- S. Butz, J. Hillermann, G. Schmidt-Naake, J. Kressler, R. Thomann, B. Heck, B. Stühn. Acta Polymerica 49, 693-699 (1998)
- La réflectivité des polymères
- G. Reiter. Chapitre VIII dans les actes de l'ecole française de réflectivité, à Marseille 1997, Eds. A. Gibaud, J. Daillant
- Surfactants: Eigenschaften und Einsatz in der Beschichtungstechnik
- G. Reiter. Kapitel 5: in Grundlagen und Verfahren der Beschichtungstechnik, Kurzlehrgang, Erlangen 1997
- Connectors in Adhesion and Contact Angle Hysteresis
- G. Reiter, A. Casoli, A. Sharma, P. Auroy. Dans les actes de JADH'97: 9émes Journées d'Etudes sur l'Adhesion, Sept. 1997 in St. Lary/F, Edition SFV, Paris 1997, p. 68-73
- Large-scale heterogeneities in entangled polymer solutions. Light-scattering study on polystyrene in toluene
- M. Heckmeier, M. Mix, G. Strobl. Macromolecules 30, 4454-4458 (1997)
- A four-state scheme for treating polymer crystallization and melting suggested by calorimetric and small angle X-ray scattering experiments on syndiotactic polypropylene
- J. Schmidtke, G. Strobl, T. ThurnAlbrecht. Macromolecules 30, 5804-5821 (1997)
- The Effect of Dissolved Side-Group Polymers on Pattern Dynamics in Nematic Liquid Crystals in a Rotating Magnetic Field
- E.E. Pashkovsky, W. Stille, G. Strobl and D. Talebi. J. Phys. II France 7 (1997) 707-727
- Structural transition in a nematic LC block copolymer induced by the transition to the LC phase
- J. Sänger, W. Gronski, S. Maas, B. Stühn, B. Heck. Macromolecules 30, 6783-6787 (1997)
- A new approach to polymer crystallization used in an analysis of data of syndiotactic polypropylene
- Gert Strobl. Acta Polymerica 48, 562-570 (1997)
- Director field patterns of nematic polymer solutions at asynchronous rotation in a magnetic field
- E. Pashkovsky, W. Stille, G. Strobl and D. Talebi. Mol. Cryst. Liq. Cryst. 302, 403 (1997)
- SAXS and TEM studies on poly(styrene)-block-poly(ethene-co-but-1-ene)-block-poly(styrene) in bulk and at various interfaces
- B. Heck, P. Arends, M. Ganter, J. Kressler, B. Stühn. Macromolecules 30, 4559-4566 (1997)
- Improving Adhesion via Connector Polymers to Stabilize Non-wetting Liquid Films
- G. Reiter, J. Schultz, P. Auroy, L. Auvray. Europhys. Lett. 33, 29 (1996)
- Instabilities of Thin Polymer Films on Layers of Chemically Identical Grafted Molecules
- G. Reiter, P. Auroy, L. Auvray. Macromolecules 29, 2150 (1996)
- The Effect of Adhesion on the Rheological and Frictional Behavior of a Confined Lubricant Film
- G. Reiter. J. Adhesion 57, 55 (1996)
- Instability of Thin Polymer Films on Coated Substrates: Rupture, Dewetting and Drop Formation
- A. Sharma, G. Reiter. J. Coll. Interf. Sci. 178, 383 (1996)
- Glass transition in ethylene-vinylacetate copolymers analyzed by combined dielectric and X-ray scattering experiments
- Bernd Holzer, Gert Strobl. Acta Polymerica 47, 40-47 (1996)
- Observation of the early stages of crystallization in polyethylene by time-dependent SAXS: Transition from individual crystals to stacks of lamellae
- T. Albrecht, G. Strobl. Macromolecules 29, 783-785 (1996)
- Autophobic Behavior of Polymers at Interfaces
- G. Reiter, P. Auroy, L. Auvray. Proceedings of the Moriond 95 Workshop, in: Moriond Condensed Matter Physics: “Short and Long Chains at Interfaces”, eds. J. Daillant, P. Guenoun, C. Marques, P. Muller, J. Trân Thanh Vân, p. 57-66
- The Solid-like State of a Confined Liquid Lubricant: Deformation and Time Effects
- G. Reiter, A. L. Demirel, J. Peanasky, L. Cai, S. Granick. Proceedings of the NATO Workshop on “The Physics of Sliding Friction” at Trieste/Italy, 1995,. Eds. B.N.J. Persson, E. Tosatti, NATO ASI Serie E, 311, 119-128 (1996)