Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 68: Crystallization, Nucleation and Self-Assembly I
CPP 68.1: Vortrag
Donnerstag, 15. März 2018, 11:45–12:00, C 230
Molecular self-assembly and dynamics on supramolecular polymers: impact of polarity and interactions strength — •Ana Bras1, Marie Dorau1, Daria Sokolova1,2, Uxue Agirre1,3, Ana Arizaga1, and Annette Schmidt1 — 1Institute of Physical Chemistry, University of Cologne, Luxemburgerstr 116, Cologne (Germany) — 2Chemistry Department, University of Basel, Basel (Switzerland) — 3Faculty of Chemistry, University of the Basque Country, Donostia-San Sebastian (Spain)
The design of supramolecular polymers with novel or improved characteristics is an important segment on synthetic materials research. The present work focus on the self-assembly of low molecular weight polypropylene oxide (PPO) and polyethylene oxide (PEO) supramolecular polymers via H-bonding in the bulk. The pair diaminotriazine (Dat) and thymine-1-acetic acid (Thy), as well as 2-ureido-4[1H]-pyrimidinone (Upy) were the H-bonding groups of choice. Particularly SAXS and rheology were combined to study the correlation between the backbone polarity and the different groups interaction strength. Results on the structure show that PEO and PPO functionalized with Thy/Dat self-assemble as linear chains while functionalized with Upy show a sphere particle morphology corresponding to a Upy rich-phase, indicating phase separation. The corresponding Upy cluster radius is larger on PPO than on PEO due to the higher chain hydrophobicity. Moreover, the dynamical behavior indicates a dramatic change from predominantly viscous behavior as observed for Thy/Dat groups.
A.B. acknowledges DFG for a research grant (BR5303)