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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  [mehr...]



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. (mehr...)

 

Liste der Veröffentlichungen

Editorial on the Special Topic “Polymer Crystallization”
Jun Xu, Günter Reiter, and Rufina G. Alamo. Crystals 12, 618 (2022)
The memory of thin polymer films generated by spin coating
Günter Reiter, Farzad Ramezani, Jörg Baschnagel. EPJE accepted
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
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, 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
Continuous illumination of a conjugated polymer causes strong enhancement of photoluminescence
Yaser AlShetwi, Daniel Schiefer, Michael Sommer. Günter Reiter. J. Phys. Chem. B 125 (2021) 5636–5644
Formation of Stacked Three-Dimensional Polymer “Single Crystals”
Zhixin Guo, Shouke Yan, Günter Reiter. Macromolecules 54 (2021) 4918–4925
Measurements of periodically perturbed dewetting force fields and their consequences on the symmetry of the resulting patterns
Konstantinos Roumpos, Sarah Fontaine, Thomas Pfohl, Oswald Prucker, Jürgen Rühe, and Günter Reiter. Scientific Reports 11 (2021) 13149
Changes in surface free energy and surface conductivity of carbon nanotubes/polyimide nanocomposite films induced by UV irradiation
Baode Zhang, Marialaura Clausi, Barbara Heck, Susanna Laurenzi, Gabriella Santonicola, Janis Kleperis, Andris Antuzevičs, Guenter Reiter, Andrey Aleshin, Anatoly Lobach. ACS Appl. Mater. Interfaces 13 (2021) 24218–24227
Surface-modified elastomeric nanofluidic devices for single nanoparticle trapping
Deepika Sharma, Roderick Y. H. Lim, Thomas Pfohl and Yasin Ekinci. Microsystems & Nanoengineering 7 (2021) 46
Optimization of Nanofluidic Devices for Geometry-Induced Electrostatic Trapping
Deepika Sharma, Roderick Y. H. Lim, Thomas Pfohl, and Yasin Ekinci. Part. Part. Syst. Charact. 2021, 38, 2000275
Tuning topography and patterns of thin polymer films on structured substrates
Konstantinos Roumpos. Inauguraldissertation der Fakultät für Mathematik und Physik 2021. DOI: 10.6094/UNIFR/194127
Morphological transitions in langmuir films of a diblock copolymer from polyethylene glycol and poly-L-lactide
Emna Khechine. Inaugural-Dissertation zur Erlangung des Doktorgrades der Fakultät für Chemie und Pharmazie, 2021
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