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Université de Fribourg

One-step ring opening metathesis block-like copolymers and their compositional analysis by a novel retardation technique

Yasir, Mohammad ; Liu, Peng ; Markwart, Jens C. ; Suraeva, Oksana ; Wurm, Frederik R. ; Smart, Jansie ; Lattuada, Marco ; Kilbinger, Andreas F. M.

In: Angewandte Chemie International Edition, 2020, vol. 59, no. 32, p. 13597-13601

Using a one-step synthetic route for block copolymers avoids the repeated addition of monomers to the polymerization mixture, which can easily lead to contamination and, therefore, to the unwanted termination of chain growth. For this purpose, monomers (M1–M5) with different steric hindrances and different propagation rates are explored. Copolymerization of M1 (propagating rapidly) with M2...

Université de Fribourg

Isotropic-nematic transition of self-propelled rods in three dimensions

Bott, Matthias Christian ; Winterhalter, F. ; Marechal, Matthieu ; Sharma, Abhinav ; Brader, Joseph M. ; Wittmann, René

In: Physical Review E, 2018, vol. 98, no. 1, p. 012601

Using overdamped Brownian dynamics simulations we investigate the isotropic- nematic (IN) transition of self-propelled rods in three spatial dimensions. For two well- known model systems (Gay-Berne potential and hard spherocylinders) we find that turning on activity moves to higher densities the phase boundary separating an isotropic phase from a (nonpolar) nematic phase. This active IN phase...

Université de Fribourg

Facile synthesis of a high molecular weight amphiphilic aramid–ROMP block copolymer

Badoux, Michael ; Drechsler, Susanne ; Pal, Subhajit ; Kilbinger, Andreas F. M.

In: Macromolecules, 2017, vol. 50, no. 23, p. 9307–9314

Herein we report the facile synthesis of an amphiphilic rod–coil block copolymer obtained by the coupling of an amine-terminated poly(dimethylpropylamine norbornene imide) (PDMAPNI) and a pentafluorophenol ester-terminated poly(dimethoxybenzyl p-aminobenzoate) (PAram). Postpolymerization amide N- deprotection of the block copolymer yielded a strongly aggregating water-soluble rod– coil...

Université de Fribourg

Phase diagram of two-dimensional hard rods from fundamental mixed measure density functional theory

Wittmann, René ; Sitta, Christoph E. ; Smallenburg, Frank ; Löwen, Hartmut

In: The Journal of Chemical Physics, 2017, vol. 147, no. 13, p. 134908

A density functional theory for the bulk phase diagram of two-dimensional orientable hard rods is proposed and tested against Monte Carlo computer simulation data. In detail, an explicit density functional is derived from fundamental mixed measure theory and freely minimized numerically for hard discorectangles. The phase diagram, which involves stable isotropic, nematic, smectic, and...

Université de Fribourg

Rheological characterization of nanostructured material based on Polystyrene-b-poly(ethylene-butylene)-b-polystyrene (SEBS) block copolymer: Effect of block copolymer composition and nanoparticle geometry

Hasanabadi, Noushin ; Nazockdast, Hossein ; Balog, Sandor ; Lattuada, Marco

In: Composites Science and Technology, 2017, vol. 149, no. Supplement C, p. 192–206

Block copolymer (BCP) nanocomposite systems are of broad interest; however, reports on the role of nanoparticles on microphase separation behavior are rare. The goal of present study is to investigate the preparation of composite nanostructured materials containing Multi-Walled Carbon Nanotubes (MWCNTs) or graphene nanoplates. BCP nanocomposites based on the linear triblock copolymer, ...