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In situ dissolution and swelling of confined lamellar polymer crystals through exposure to humid air

Brahim Bessif, Thomas Pfohl, Barbara Heck, Yaser Alshetwi, Emna Khechine, Jun Xu, and Günter Reiter. Macromolecules 55, 6015–6022, 2022

2022-brahim.jpgInduced by exposure to humid air, we observed in-situ the temporal and spatial changes in thickness and morphology of sandwich-like polymer platelets of a block copolymer. These micron-size platelets consisted of a crystalline poly(ethylene oxide) (PEO) lamella confined between two glassy poly(styrene) (PS) layers, formed via crystallization of a hydrophobic-hydrophilic PS-b-PEO diblock copolymer. We observed first the dissolution of the confined crystalline PEO layers characterized by sharp dissolution front propagating at a constant velocity as described by case II diffusion of a liquid into a solid. (mehr...)



Determining Entanglement Molar Mass of Glassy Polyphenylenes Using Mechanochromic Molecular Springs

Maximilian Raisch, Günter Reiter, Michael Sommer. ACS Macro Lett. 2022, 11, 760–765

2022-sommer.jpgMolecular force transduction in tough and glassy poly(meta,meta,para-phenylene) (PmmpP) was investigated as a function of Mn using covalently incorporated mechanochromic donor–acceptor torsional springs based on an ortho-substituted diphenyldiketopyrrolopyrrole (oDPP). Blending oDPP-PmmpP probe chains with long PmmpP matrix chains allowed us to investigate molar-mass-dependent mechanochromic properties for a series of specimens having mechanically identical properties.(mehr...)



The memory of thin polymer films generated by spin coating

Günter Reiter, Farzad Ramezani, Jörg Baschnagel. EPJE 45 (2022) 51

2022-farzad.jpgWe present results from isothermal and temperature-sweep creep experiments adapted to filaments which were derived from spin coated and subsequently crumpled thin polystyrene films. Due to the existence of residual stresses induced by preparation, the filaments showed significant shrinkage which we followed as a function of time at various temperatures. In addition, the influence of preparation conditions and subsequent annealing of supported thin polymer films on shrinkage and relaxation behavior was investigated. The temporal evolution of shrinkage revealed a sequence of relaxation regimes. (mehr...)



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...]

 

Liste der Veröffentlichungen

A Neutron Reflectometer for the Investigation of Solid and Liquid Interfaces
M. Stamm, G. Reiter, S. Hüttenbach. Physica B 156, 564-566 (1989)
Kinetics of Relaxation and Unmixing in Polymer Blends as Studied by X-Ray-Scattering
G. Strobl. Makromolekulare Chemie - Macromolecular Symposia 26, 413-429 (1989)
X-Ray-Scattering Study of Molecular Order in a Liquid Crystal-Side Group Polysiloxane
W. Hotz, G. Strobl. Colloid and Polymer Science 267, 889-898 (1989)
Interdiffusion in the Partially Miscible Polymer Blend of Deuterated Polystyrene and Poly(styrene-co-bromostyrene)
F. Bruder, R. Brenn, B. Stühn, G.R. Strobl. Macromolecules 22, 4434-4437 (1989)
Structure Relaxation after Temperature Jumps in Homogeneous Polystyrene Poly(styrene-co-bromostyrene) Blends
G.R. Strobl, G. Urban. Colloid and Polymer Science 266, 398-404 (1988)
Soliton dynamics and impurities in the Pariser-Parr-Pople model of alternating trans-polyacetylen
R. Markus, W. Förner, J. Ladik. Solid States Communications 68, 135-138 (1988)
Investigations on Low Temperature Transitions and Time Effects of Branched Polyethylene by the Positron Lifetime Technique
P. Kindl, G. Reiter. phys. stat. sol. (a) 104, 707 (1987)
Small-Angle X-Ray-Scattering Study of Spinodal Decomposition in Polystyrene Poly(styrene-co-bromostyrene) Blends
H. Meier, G.R. Strobl. Macromolecules 20, 649-654 (1987)
Surface Melting in Melt-Crystallized Linear Polyethylene
Y. Tanabe, G.R. Strobl, E.W. Fischer. Polymer 27, 1147-1153 (1986)
Thermally Reversible Phase Separation in Polystyrene Poly(styrene-co-4-bromostyrene) Blends
G.R. Strobl, J.T. Bendler, R.P. Kampour, A.R. Shultz. Macromolecules 19, 2683-2689 (1986)
Structure Evolution during Spinodal Decomposition of Polymer Blends
G.R. Strobl. Macromolecules 18, 558-563 (1985)
Dielectric Relaxation of Liquid Crystalline Polyacrylates and Polymethacrylates
R. Zentel, G.R. Strobl, H. Ringsdorf. Macromolecules 18, 960-965 (1985)
Structures of Liquid Crystalline Side Group Polymers Oriented by Drawing
R. Zentel, G.R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 185, 2669-2676 (1984)
Molecular-Motion, Defect Structures and Phase-Transitions in Oligomer Crystals
G.R. Strobl, H. Schwickert, T. Trzebiatowski. Berichte der Bunsen-Gesellschaft - Physical Chemistry Chemical Physics 87, 274-279 (1983)
Crystallization and Melting of Fractions of Branched Polyethylene. 2. Dilatometric and Small-Angle X-Ray-Scattering Study on the Molecular Weight Dependence of Isothermal Crystallization
E. Maderek, G.R. Strobl. Coll. Polym. Sci. 261, 471-476 (1983)
Effect of Amorphous Sequences on the Longitudinal Acoustic Modes in Partially Crystalline Polymers. 1. Transfer Matrix Method
G.R. Strobl. J. Polym. Sci. B - Polymer Physics 21, 1357-1380 (1983)
On the Kinetics of Isothermal Crystallization of Branched Polyethylene
G.R. Strobl, T. Engelke, E. Madarek, G. Urban. Polymer 24, 1585-1589 (1983)
Kristallisation und Schmelzverhalten von Fraktionen verzweigten Polyethylens. 1. Darstellung und Charakterisierung der Fraktionen
Eugeniusz Maderek, Gert R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 184, 2553-2561 (1983)
Raman Spectrum of the High Pressure Phase of Polyethylene
R. Eckel, H. Schwickert, M. Buback, G.R. Strobl. Polymer Bulletin 6, 559-564 (1982)
Die Kristallstruktur von Cycloalkanen
Thomas Trzebiatowski, Martin Dräger, Gert R. Strobl. Makromolekulare Chemie - Macromolecular Chemistry and Physics 183, 731-744 (1982)
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