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Recent Publications


Tuning the hydraulic resistance by swelling-induced buckling of membranes in high-aspect-ratio microfluidic devices

Claas-Hendrik Stamp, Binyam Solomon, Friederike Lang, Efstathios Mitropoulos and Thomas Pfohl.
Lab Chip 23 (2023) 3662-3670

stamp.jpgControlling fluid flow in microfluidic devices and adapting it to varying conditions by selectively regulating hydrodynamic properties is of critical importance, as the field of microfluidics faces increasingly complex challenges in its wide range of applications. One way to manipulate flows in microfluidic devices is to introduce elastic elements that can be actively or passively deformed. In this work, we developed a membrane-based microfluidic device that allows us to study the deformation of swollen thin membranes as a function of the volume fractions in binary mixtures – here isopropanol and water. (more...)


 

Unraveling the complex polymorphic crystallization behavior of the alternating copolymer DMDS-alt-DVE

Valentina Pirela, Justine Elgoyhen, Radmila Tomovska, Jaime Martin Perez, Cuong Minh Quoc Le, Abraham Chemtob, Brahim Bessif, Barbara Heck, Günter Reiter, and Alejandro Müller. ACS Appl. Polym. Mater.  5 (2023) 5260–5269

valent.jpgA complex crystallization behavior was observed for the alternating copolymer DMDS-alt-DVE synthesized via thiol–ene step-growth polymerization. Understanding the underlying complex crystallization processes of such innovative polythioethers is critical for their application, for example, in polymer coating technologies. These alternating copolymers have polymorphic traits, resulting in different phases that may display distinct crystalline structures. The copolymer DMDS-alt-DVE was studied in an earlier work, where only two crystalline phases were reported: a low melting, L – Tm, and high melting, H – Tm phase. Remarkably, the H – Tm form was only achieved by the previous formation and melting of the L – Tm form. We applied calorimetric techniques encompassing seven orders of magnitude in scanning rates to further explore this complex polymorphic behavior. (more...)


Transparent, thermoplastic, aliphatic polyesters through crystallization under molecular confinement

Maziar Matloubi, Melika Sarem, Barbara Heck, Günter Reiter, and V. Prasad Shastri.  Matter 6 (2023) 3057-3074

shastri-matter.jpgIn semi-crystalline biodegradable polymers, uncontrolled evolution of crystallinity impacts processing and bulk properties, limiting their application. Through molecular confinement of low-molecular-weight poly(L-lactic acid) (PLLA) segments by polysiloxane blocks and processing at far-from-equilibrium conditions, PLLA crystallization into lamellae of a few nm in thickness with coherence lengths below 100 nm was achieved, thus giving access to films that are optically transparent for over 5 years, possess high Young’s modulus and elongation at break, undergo controlled degradation, and support functional endothelialization. The films possess a nanophase segregated bulk morphology with a hydrophobic siloxane-dominated surface that can be pressure bonded following cold oxygen plasma activation and low-temperature glassy PLLA domains interspersed by nanoscale crystalline physical crosslinks that enable glass transition temperature-triggered shape change. The segmented thermoplastic polyesters (STEPs) can additionally be processed using melt-extrusion printing into 3D objects, thus opening potential application opportunities in the fabrication of implantable/degradable electronics, smart textiles, and packaging. (more...)

 

List of Publications

Block crystallization in model triarm star block copolymers with two crystallizable blocks. A time-resolved SAXS-WAXS study
G. Floudas, G. Reiter, O. Lambert, P. Dumas, F.J. Yeh, B. Chu. In: Scattering from Polymers: Characterization by X-rays, Neutrons, and Light. ACS Symposium Series 739 (2000) 448-455
Light scattering by fluctuations within a nematic wetting layer in a isotropic phase of a liquid crystal
R. Sigel, G. Strobl. Journal of Chemical Physics 112, 1029-1039 (2000)
Temperature and strain rate independence of critical strains in polyethylene and poly(ethylene-co-vinyl acetate)
S. Hobeika, Y. Men, G. Strobl. Macromolecules 33, 1827-1833 (2000)
Investigating the mechanisms of polymer crystallization by SAXS experiments
G. Hauser, J. Schmidtke, G. Strobl, T. Thurn-Albrecht. ACS Symposium Series 739, 140-151 (2000)
Static and Dynamic Light Scattering of a Nematic Side-Group Polysiloxane
Jürgen Schmidtke, Werner Stille, and Gert Strobl. Macromolecules 33, 2922 (2000)
Isothermal crystallization and melting of isotactic polypropylene analyzed by time- and temperature-dependent small-angle X-ray scattering experiments
M. Iijima, G. Strobl. Macromolecules 33, 5204-5214 (2000)
From the melt via mesomorphic and granular crystalline layers to lamellar crystallites: A major route followed in polymer crystallization?
G. Strobl. Eur. Phys. J. E 3, 165 (2000)
Steps in the formation of the partially crystalline state
Barbara Heck, Thosten Hugel, Masanori Iijima, Gert Strobl. Polymer 41, 8839-8848 (2000)
Polymer Studies
G. Reiter. Chapter 10 in Lecture Notes in Physics No. 58, X-Ray and Neutron Reflectivity: Principles and Applications, Eds. J. Daillant, A. Gibaud , 1999
Morphological Pathways of Pattern Evolution and Dewetting in Thin Liquid Films
A. Sharma, R. Khanna, R. Konnur, G. Reiter. K.L. Mittal, ed., VSP Publishers, Utrecht (1999)
Nanometer-scale Surface Patterns with Long Range Order Created by Crystallisation of Diblock Copolymers
G. Reiter, G. Castelein, P. Hoerner, G. Riess, A. Blumen, J.-U. Sommer. Phys. Rev. Lett. 83, 3844-3847 (1999)
A Thin Film Analog of the Corneal Mucus Layer of the Tear Film: An Enigmatic Long Range Non-Classical DLVO Interaction in the Breakup of Thin Polymer Films
A. Sharma, R. Khanna, G. Reiter. Colloids & Surfaces B 14, 223-235 (1999)
The Strength of Long-Range Forces Across Thin Liquid Films
G. Reiter, A. Sharma, R. Khanna, A. Casoli, M.O. David. J. Coll. Interf. Sci. 214, 126 (1999)
Destabilising Effect of Long Range Forces in Thin Liquid Films on Wettable Substrates
G. Reiter, A. Sharma, A. Casoli, M.-O. David, R. Khanna, P. Auroy. Europhys. Lett. 46, 512 (1999)
Thin Film Instability Induced by Long Range Forces
G. Reiter, A. Sharma, A. Casoli, M.O. David, R. Khanna, P. Auroy. Langmuir 15, 2551-2558 (1999)
Network stretching, slip processes, and fragmentation of crystallites during uniaxial drawing of polyethylene and related copolymers. A comparative study
R. Hiss, S. Hobeika, C. Lynn, G. Strobl. Macromolecules 32, 4390-4403 (1999)
Reversible surface melting of PE and PEO crystallites indicated by TMDSC
W.B. Hu, T. Albrecht, G. Strobl. Macromolecules 32, 7548-7554 (1999)
A general scheme derived from video-controlled stretching tests and WAXS for describing tensile deformations of polyethylenes
R. Hiss, S. Hobeika, C. Lynn, G. Strobl. Journal of Macromolecular Science - Physics B38, 847-858 (1999)
Steps in the transition of an entangled polymer melt to the partially crystalline state
B. Heck, T. Hugel, M. Iijima, E. Sadiku, G. Strobl. New Journal of Physics 1, 17 (1999).
Building lamellae from blocks: The pathway followed in the formation of crystallites of syndiotactic polypropylene
T. Hugel, G. Strobl, R. Thomann. Acta Polymerica, 50, 214 (1999)
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