Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 20: Soft Particles in Flows III (Focus session, joint DY/CPP)
DY 20.2: Vortrag
Dienstag, 21. März 2017, 14:30–14:45, ZEU 160
Telechelic star polymers under shear. — •Diego Jaramillo-Cano1, Manuel Camargo2, and Christos N. Likos1 — 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria. — 2CICBA, Universidad Antonio Nariño Campus Farallones, Km 18 via Cali-Jamundí, 760030 Santiago de Cali, Colombia.
Telechelic star polymers(TPSs) are macromolecules formed by a number of diblock copolymers(arms) anchored to a common central core, being the internal monomers solvophilic and the end monomers solvophobic. Recent studies have demonstrated that TPSs constitute self-assembling building blocks with specific softness, functionalisation, shape and flexibility: depending on different physical and chemical parameters, e.g. number of arms f, solvophobic-to-solvophilic ratio α and solvent quality λ, the conformation of TSPs features a well defined number of attractive spots on the surface(patches). In this work, we exhaustively study the conformation of isolated TSPs under shear by means of a combination of MPCD for the solvent and standard MD for the monomers. By employing the Lees-Edwards boundary condition, we systematically evaluate star shape descriptors, patches distinctive features and star rotation frequency as a function of the Weissenberg number Wi for low functionality of the TPSs. We cover a wide range of parameters for representative systems given by f=18, α=0.3,0.5,0.7, λ=1.0,1.1 and Wi=1-1400. Since the conformation of single stars is expected to be preserved in low-density bulk phases, the presented results are a first step in understanding and predicting the rheological properties of semi-dilute suspensions of this kind of polymers.