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Neueste Veröffentlichungen
Anmol Arya, Solomon L. Joseph, Francois Vonau, Jean-Luc Bubendorff, Silvia Siegenführ, Laurent Simon, Günter Reiter. J. Phys. Chem. C, published online
In the course of electrospraying in a vacuum, polymers acquire electric charges, which are distributed along their backbone. Here, we demonstrate that these charges have a strong impact on the molecular ordering and spectroscopic properties of conjugated polymers when deposited on substrates with an insulating oxide layer. To this end, we electrosprayed varying amounts of poly(3-hexylthiophene) (P3HT) onto silicon substrates with oxide layers of different thickness. The resulting morphologies were explored by atomic force microscopy. The corresponding spectroscopic properties, including their changes in time upon illumination, were derived from photoluminescence (PL) measurements. On insulating substrates, charges were retained on the polymer chains, causing long-range electrostatic repulsion and the formation of largely separated droplet-like objects containing multiple chains. These objects exhibited significant PL intensities for photons with a wavelength (λ) less than ca. 600 nm, suggesting the lack of π–π stacking interactions between P3HT chains. (more...)
Reversible Metamorphosis of a Conjugated Polymer Induced by Photoexcitation
Solomon Joseph, Anmol Arya, Günter Reiter. Advanced Photonics Research 7 (2026) e202500311
Optoelectronic properties of materials are frequently examined through spectroscopic tools based on the absorption and emission of (visible) photons. Typically, one assumes that these transient characterization processes do not cause observable change of these properties because of the low power of the employed light sources. However, for flexible conjugated polymers in a medium of low viscosity, it is decidedly unclear whether photoexcitation of electrons on the backbone of a long polymer chain has an influence on macromolecular conformations and the corresponding intermolecular interactions. Here, we provide clear experimental evidence that continuous absorption of photons progressively causes persistent changes in the spectroscopic properties of conjugated polymers, accompanied by microscopically observable changes in their spatial distribution within a low-viscosity matrix. By contrast, all these changes were completely absent in nonilluminated parts of the same sample.(more...)
Temperature dependence of crystal – melt coexistence for supported polyethylene filaments
Da Huang, Thorsten Hugel, Bizan N. Balzer, Günter Reiter. Nature Communications 16 (2025) 11127
The broken symmetry of molecular interactions at interfaces is causing that crystals are often covered by a thin liquid layer of their own melt. Such crystal–melt coexistence can be related to phenomena of surface premelting, secondary nucleation and melting point depression, particularly important for small systems. Here, we employed intermittent-contact mode atomic force microscopy imaging on nanoscopic semi-cylindrical filaments of polyethylene on a substrate to observe that these filaments contained a crystalline core bounded by molten regions of rather uniform width, W_soft= (9 ± 2) nm at room temperature, which increased reversibly with temperature T. Filaments smaller than ca. 2∙W_soft (T) were completely molten. The values of W_soft (T) compared favorably with theoretically predicted characteristic length scales in the context of nucleation, surface premelting and the melting point depression of finite size crystals. Altogether, we show that these three phenomena are related and dominated by the intermolecular forces acting at crystal surfaces. (more...)
Liste der Veröffentlichungen
- Crystallization of s-polypropylene from the glassy state: Indications for a multistage process
- M. Grasruck, G. Strobl. Macromolecules 36, 86-91 (2003)
- A molar mass induced transition in the yielding properties of linear polyethylene
- Qiang Fu, Yongfeng Men, Gert Strobl. Polymer 44, 1941-1947 (2003)
- Understanding of the tensile deformation in HDPE/LDPE blends based on their crystal structure and phase morphology
- Qiang Fu, Yongfeng Men, Gert Strobl. Polymer 44, 1927-1933 (2003)
- Critical strains in poly(epsilon-caprolactone) and blends with poly(vinyl methyl ether) and poly(styrene-co-acrylonitrile)
- Yongfeng Men, Gert Strobl. Macromolcules 36, 1889-1898 (2003)
- On the mechanisms of recrystallization after melting in semicrystalline polymers: The effect of the initial melt state
- M. Al-Hussein, G. Strobl. Journal of Macromolecular Science - Physics B42, 677-685 (2003)
- Fluorescence of a dye-doped cholesteric liquid crystal film in the region of the stop band: theory and experiment
- J. Schmidtke and W. Stille. Eur. Phys. J. B 31, 179 (2003)
- Investigating polymer crystallization by time-dependent light scattering: a direct approach in the data analysis applied for s-polypropylene
- Anke Hoffmann, Gert Strobl. Polymer 44, 5803-5809 (2003)
- Defect Mode Emission of a Dye Doped Cholesteric Polymer Network
- J. Schmidtke, W. Stille, H. Finkelmann. Phys. Rev. Lett. 90, 083902 (2003)
- Condensed Matter Physics: Crystals, Liquids, Liquid Crystals, and Polymers
- Gert Strobl. Springer 2003, ISBN 978-3540003533
- Role of the entangled amorphous network in tensile deformation of semicrystalline polymers
- Y. F. Men, J. Rieger, G. Strobl. Physical Review Letters 91, 095502 (2003)
- Photonic defect modes in cholesteric liquid crystal films
- J. Schmidtke and W. Stille. Eur. Phys. J. E 12, 553 (2003)
- Characteristic variations in the effect of diluents on polymer crystallization and melting observed for a sample of poly (ethylene-co-octene)
- Barbara Heck, Gert Strobl, Michael Grasruck. Eur. Phys. J. E 11, 117-130 (2003)
- Editorial: Special issue on Properties of Thin Polymer Films
- Günter Reiter (Editor) and James Forrest (Guest Editor). Eur. Phys. J. E 8, 101 (2002)
- Morphological Phase Transitions in Spontaneous Dewetting of Thin Films on Homogeneous and Heterogeneous Surfaces
- A. Sharma, G. Reiter. Phase Transitions 75, 377-399 (2002)
- Pattern formation and ordering in thin films of crystallisable block copolymers
- Günter Reiter, Gilles Castelein, Jens-Uwe Sommer. Macromol. Symp. 183, 173–178 (2002)
- Some relevant parameters affecting the glass transition of supported ultra-thin polymer films
- Y. Grohens, L. Hamon, G. Reiter, A. Soldera, Y. Holl. Eur. Phys. J. E 8, 217-224 (2002)
- Are changes in morphology clear indicators for the glass transition in thin polymer films? Tentative ideas
- Günter Reiter. Eur. Phys. J. E 8, 251-255 (2002)
- The melting line, the crystallization line, and the equilibrium melting temperature of isotactic polystyrene
- M. Al-Hussein, G. Strobl. Macromolecules 35, 1672-1676 (2002)
- From crystalline block slips to dominance of network stretching - Mechanisms of tensile deformation in semi-crystalline polymers
- Yongfeng Men, Gert Strobl. Chinese Journal of Polymer Science 20, 161-170 (2002)
- Role and importance of radius of gyration of chains in the melt in the crystalization of poly(1-butene)
- Qiang Fu, Gert Strobl. Chinese Journal of Polymer Science 20, 143-154 (2002)