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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
- Gradient Interfaces in SBS and SBS/PS Blends and Their Influence on Morphology Development and Material Properties
- Yi Thomann, Ralf Thomann, Alfred Hasenhindl, Rolf Mülhaupt, Barbara Heck, Konrad Knoll, Helmut Steininger, Kay Saalwächter. Macromolecules 42, 5684-5699 (2009)
- Understanding crystal orientation in quasi-one-dimensional polymer systems
- Yu Ma, Wenbing Hu, Jamie Hobbs, Guenter Reiter. Soft Matter 4, 540-543 (2008)
- Oligonucleotide nanostructured surfaces: effect on Escherichia coli curli expression
- Nicolas Cottenye, Francisco Teixeira Jr., Arnaud Ponche, Günter Reiter, Karine Anselme, Wolfgang Meier, Lydie Ploux, Corinne Vebert-Nardin. Macromolecular Bioscience 8, 1161-1172 (2008)
- Morphological Instabilities of Polymer Crystals
- Nikolay Grozev, Ioan Botiz, Günter Reiter. Eur. Phys. J. E 27, 63-71 (2008)
- Crystal nucleation enhanced at the diffusive interface of immiscible polymer blends
- Yu Ma, Liyun Zha, Wenbing Hu, Günter Reiter, Charles C. Han. Phys. Rev. E 77, 061801 (2008)
- Semicrystalline Macromolecular Design by Nitroxide-Mediated Polymerization
- Khaled Karaky, Gérald Clisson, Günter Reiter, Laurent Billon. Macromol. Chem. Phys. 209, 715–722 (2008)
- Viscoelastic Thin Polymer Films under Transient Residual Stresses: Two-Stage Dewetting on Soft Substrates
- S. Al Akhrass, G. Reiter, S.Y. Hou, M. H. Yang, Y. L. Chang, F. C. Chang, C. F. Wang, A. C.-M. Yang. Phys. Rev. Lett. 100, 178301 (2008)
- The Influence of Protic Non-Solvents Present in the Environment on Structure Formation of Poly(γ-benzyl-L-glutamate) in Organic Solvents
- Ioan Botiz, Nikolay Grozev, Helmut Schlaad, Günter Reiter. Soft Matter, 4, 993-1002 (2008)
- Influence of Progressive Cross-Linking on Dewetting of Polystyrene Thin Films
- Samer Al Akhrass, Roxana-Viorela Ostaci, Yves Grohens, Eric Drockenmuller, Günter Reiter. Langmuir 24, 1884-1890 (2008)
- Tuning the surface/bulk properties by the control of the amphiphilic profile in gradient copolymer
- K. Karaky, C. Derail, G. Reiter, et al. Conference Information: 46th Microsymposium on Macromolecules - Nanostructured Polymers and Polymer Nanocomposites, Jul.08 - Aug.12, 2007 Prague, Czech Republic, Macromolecular Symposia 267, 31-40 (2008)
- Characterizing and modeling the tensile deformation of polyethylene: The temperature and crystallinity dependences
- Ke Hong, Gert Strobl. Polymer Science Series A 50, 483-493 (2008)
- Zero Growth Temperature of Crystallizing Polyethylene
- T. Y. Cho, W. Stille, G. Strobl. Macromolecules 40, 2596 (2007)
- Zero growth temperature and growth kinetics of crystallizing poly(ε-caprolactone)
- T.-Y. Cho, W. Stille, G. Strobl. Colloid Polym. Sci. 285, 931 (2007)
- Progress in Understanding Polymer Crystallization
- Editors: Günter Reiter and Gert Strobl. Lecture Notes in Physics 714 (2007), Springer Berlin/Heidelberg ISSN: 978-3-540-47305-3
- Formation of low-dimensional close-packed arrays of nanoparticles in a dewetting water layer
- Leonid V. Govor, Günter Reiter, Gottfried H. Bauer, Jürgen Parisi. Phys. Rev. E 76, 041609 (2007)
- Thin Film Morphology in Triblock Terpolymers with One and Two Crystallizable Blocks
- Adriana Boschetti-de-Fierro, Lea Spindler, Günter Reiter, Dania Olmos, Sergei Magonov, Volker Abetz. Macromolecules 40, 5487-5496 (2007)
- Stable dispersions of highly anisotropic nanoparticles formed by cocrystallization of enantiomeric diblock copolymers
- D. Portinha, F. Boue, L. Bouteiller, G. Carrot, C. Chassenieux, S. Pensec, G. Reiter. Macromolecules 40, 4037- 4042 (2007)
- Cooperative Rearrangements Leading to Long Range Order in Monolayers of Supramolecular Polymers
- F. Vonau, D. Aubel, L. Bouteiller, G. Reiter, L. Simon. Phys. Rev. Lett. 99, 086103 (2007)
- Relaxation of Residual Stress and Reentanglement of Polymers in Spin-Coated Films
- Pascal Damman, Sylvain Gabriele, Séverine Coppée, Sylvain Desprez, Didier Villers, Thomas Vilmin, Elie Raphaël, Moustafa Hamieh, Samer Al Akhrass, Günter Reiter. Phys. Rev. Lett. 99, 036101 (2007)
- Switching layer stability in a polymer bilayer by thickness variation
- J. P. de Silva, M. Geoghegan, A. M. Higgins, G. Krausch, M.-O. David, G. Reiter. Phys. Rev. Lett. 98, 267802 (2007)