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Recent Publications


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  [more...]



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

2021-rei--14.jpgUsing the set-up of an optical microscope, we have examined the influence of illumination with white light on the crystallization behavior in molten films of poly(3-(2,5-dioctylphenyl)thiophene) and poly(3-hexylthiophene). We observed a reduction in nucleation density and crystal growth rate induced by illumination. The amount of this reduction increased with the increase in light intensity. Melting samples previously crystallized under illumination and recrystallizing them in the dark showed full reversibility of the crystallization behavior, demonstrating that these changes in the crystallization behavior induced by illumination were not permanent. (mehr...)



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. 2021, 2100740

2021-rei-15.jpgA photocatalytic thiol-ene aqueous emulsion polymerization under visible-light is described to prepare linear semicrystalline latexes using 2,2’-dimercaptodiethyl sulfide as dithiol and various dienes. The procedure involves low irradiance (3 mW cm–2), LED irradiation source, eosin-Y disodium as organocatalyst, low catalyst loading (< 0.05% mol) and short reaction time scales (< 1 h). The resulting latexes has molecular weights of about 10 kg mol–1, average diameters of 100 nm and a linear structure consisting only of thioether repeating units. (more...)


 

List of Publications

Untersuchung der druckinduzierten Kristallisation von Polyäthylen mit Hilfe einer neuen Raman-Hochdruckzelle
R. Eckel, M. Buback und G. R. Strobl. Coll. Polym. Sci. 259, 326-334 (1981)
Model of Partial Crystallization and Melting Derived from Small-Angle X-Ray-Scattering and Electron-Microscopic Studies on Low-Density Polyethylene
G.R. Strobl, M.J. Schneider, I.G. Voigt-Martin. J. Polym. Sci. B - Polymer Physics 18, 1361-1381 (1980)
Direct Evaluation of the Electron Density Correlation Function of Partially Crystalline Polymers
G.R. Strobl, M. Schneider. J. Polym. Sci. B - Polymer Physics 18, 1343-1359 (1980)
Analysis of the Intensities of the Longitudinal Acoustic Vibtrations in n-Alkanes and Polyethylene
G.R. Strobl, R. Eckel. Coll. Polym. Sci. 258, 570-577 (1980)
Phase-Transitions in Crystals of Chain Molecules. Relation between Defect Structures and Molecular Motion in the four Modifications of n-C33H68
B. Ewen, G.R. Strobl, D. Richter. Faraday Discussions 69, 19-31 (1980)
Molecular Orientational Correlations and Local Order in n-Alkane Liquids
E.W. Fischer, G.R. Strobl, M. Dettenmaier, M. Stamm, N. Steidle. Faraday Discussions 68, 26-45 (1979)
Einige polymerspezifische Anwendungen der Schwingungsspektroskopie
G.R. Strobl. Coll. Polym. Sci. 257, 584-590 (1979)
Circular Fluorescence Polarization of Achiral Molecules in Cholesteric Liquid Crystals
H. Stegemeyer, W. Stille and P. Pollmann. Israel J. Chem. 18, 312 (1979)
Molekulare Deutung der Umwandlungswärmen bei den Modifikationsübergängen des n-Tritriacontans
G.R. Strobl. Coll. Polym. Sci. 256, 427-445 (1978)
Raman Spectroscopic Method for Determining Crystallinity of Polyethylene
G.R. Strobl, W. Hagedorn. J. Polym. Sci. Part B - Polymer Physics 16, 1181-1193 (1978)
Molecular-Motion, Thermal-Expansion, and the Phase-Transitions in Paraffins: A Model for Polymers
G.R. Strobl. J. Polym. Sci. Part C - Polymer Symposium 59, 121-142 (1977)
Die molekularen Grundlagen der anisotropen thermischen Ausdehnung von Paraffinen und Polyäthylen. Eine ramanspektroskopische Untersuchung am Beispiel des N-Tritriacontans
G.R. Strobl. Coll. Polym. Sci. 254, 170-189 (1976)
Packing of Paraffin Chains in 4 Stable Modifications of n-Tritriacontane
W. Piesczek, G.R. Strobl, K. Malzahn. Acta Cryst. B 30, 1278 (1974)
Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 2. Study of Molecular-Motion Using Infrared Spectroscopy and Wide-Line Nuclear Magnetic-Resonance Measurements
B. Ewen, E.W. Fischer, W. Pieszek, G. Strobl. J. Chem. Phys. 61, 5265-5272 (1974)
Defect Structure and Molecular-Motion in 4 Modifications of Normal-Tritriacontane. 1. Study of Defect Structure in Lamellar Interfaces Using Small-Angle X-Ray-Scattering
G. Strobl, B. Ewen, E.W. Fischer, W. Piesczek. J. Chem. Phys. 61, 5257-5264 (1974)
An exactly solvable model for coherent and incoherent exciton motion
H. Haken and G. Strobl. Zeitschrift für Physik 262, 135-148 (1973)
Small-angle x-ray scattering experiments for investigating the validity of the two-phase model
G.R. Strobl, N. Müller. Journal of Polymer Science B - Polymer Physics 11, 1219-1233 (1973)
Determination of Lamellar Structure of Partially Crystalline Polymers by Direct Analysis of their Small-Angle X-Ray-Scattering Curves
G.R. Strobl. Journal of Applied Crystallography 6, 365-370 (1973)
Synthese und Eigenschaften molekulareinheitlicher n-Paraffine bis zum C140H282
W. Heitz, E.W. Fischer, R. Peters, T. Wirth, G. Strobl. Makromolekulare Chemie 162, 63 (1972)
Analyse von spaltverschmierten Kleinwinkelstreukurven lamellarer Strukturen
G.R. Strobl. Kolloid-Zeitschrift and Zeitschrift für Polymere 250, 1039-1046 (1972)
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