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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

Dewetting as a Probe of Polymer Mobility in Thin Films
G. Reiter. Macromolecules 27, 3046 (1994)
Chain Reorientation in Poly(tetrafluoroethylene) by Mobile Twin-Helix Reversal Defects
M. Kimmig, G. Strobl, B. Stühn. Macromolecules 27, 2481-2495 (1994)
Local Motion in the beta-Transition Range of Partially Crystalline Polyethylene Studied by Neutron-Scattering
B. Holzer, G. Strobl, B. Stühn, N.H. Andersen. Colloid and Polymer Science 272, 1396-1402 (1994)
Dynamics of Rotational Motion in Liquid Crystalline Systems
W. Stille, G. Strobl. in: R. Richert, A. Blumen (Eds.), Disorder Effects on Relaxational Processes, p. 725, Springer, Berlin (1994).
Molecular Weight Dependence of the Rotational Diffusion Constant and the Rotational Viscosity of Liquid Crystalline Side Group Polymers
S. Götz, W. Stille, G. Strobl, H. Scheuermann. Macromolecules 26, 1520 (1993)
Near-Critical Behavior of the Dynamic Stress-Optical Coefficient in Liquid Crystalline Elastomers
R. Sigel, W. Stille, G. Strobl and R. Lehnert. Macromolecules 26, 4226 (1993)
Adhesion Instabilities of Surfaces Undergoing Shear
G. Reiter, J.S. Peanasky, L. Cai, A.L. Demirel, S. Granick. ACS Polymer Preprint Fall 1993
Dynamics of Polymer Interdiffusion at Short Times
U. Steiner, G. Reiter. Proceedings of the Les Houches Conference 1991: Dynamical Phenomena at Interfaces, Surfaces and Membranes, D. Beysens, N. Boccara, G. Forgacs, eds., Nova Science Publishers, New York, p. 511-512 (1993)
Unstable Thin Polymer Films: Rupture and Dewetting Processes
G. Reiter. Langmuir 9, 1344 (1993)
Mobility of Polymers in Films Thinner Than Their Unperturbed Size
G. Reiter. Europhysics Letters 23, 579 (1993)
Investigation of the Interdiffusion between Poly(methylmethacrylate) Films by Marker Movement
Y. Liu, G. Reiter, K. Kunz, M. Stamm. Macromolecules 26, 2134 (1993)
Short Time Dynamics of Polymer Diffusion
G. Reiter, U. Steiner. Progr. Colloid and Polymer Science 91, 93 (1993)
Transition Regions and Surface Melting in Partially Crystalline Polyethylene: A Raman Spectroscopic Study
R. Mutter, W. Stille, and G. Strobl. J. Polym. Sci. Part B: Polym. Phys. 31, 99 (1993)
Smectic Surface-Structures in the Isotropic-Phase of Liquid-Crystalline Polymers Studied by X-Ray Reflectivity
H. Elben, G. Strobl. Macromolecules 26, 1013-1018 (1993)
Transient Inhomogenities in Polymeric Liquids and Solutions - Characterization by Static and Dynamic Light-Scattering
T. Koch, G.R. Strobl, B. Stühn. Polymer 34, 1988-1990 (1993)
Kinetics of Rotational Motion in Liquid-Crystalline Polymers
W. Stille, G. R. Strobl. Polym. Sci. (Russia) 35, 1484 (1993)
Investigation of Optical Anisotropy at Polymer Surfaces and in Thin Polymer-Films by Variable-Angle Ellipsometry
H. Kasten, G. Strobl. Fresenius Journal of Analytical Chemistry 346, 300-302 (1993)
Molecular Weight Dependence of the Rotational Diffusion Constant and the Rotational Viscosity of Nematic Side-Group Polymers
S. Götz, W. Stille, G. Strobl. Ber. Bunsenges. Phys. Chem. 97, 1315 (1993)
Structure of Thin Block-Copolymers Films Studied by X-Ray Reflectivity
R. Mutter, G. Strobl, B. Stühn. Fresenius Journal of Analytical Chemistry 346, 297-299 (1993)
Dependence of the rotational viscosity of nematic mixtures on the rotational diffusion constants of their components
G. Christoph, W. Stille and G. Strobl. J. Chem. Phys. 99, 3075 (1993)
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