Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 23: Poster: Polymer Dynamics

CPP 23.15: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

Specific vs. unspecific interaction and aggregation in bulk supramolecular polymers — •Tingzi Yan¹, Klaus Schröter¹, Florian Herbst², Wolfgang Binder², and Thomas Thurn-Albrecht¹ — ¹Institute of Physics, Martin-Luther University Halle-Wittenberg — ²Institute of Chemistry, Martin-Luther University Halle-Wittenberg

Hydrogen bonded supramolecular polymers have attracted much attention in the past decade due to their special properties. They combine the advantages of polymers and of non-covalently bonded supramolecules with reversible structures. In general, the association behavior in solution is simpler and better understood than in the bulk. We present combined small angle x-ray scattering and rheological experiments, complemented by IR spectroscopy on a series of polyisobutylene chains terminated with hydrogen bonding units of different strengths. While in solution the functional units form specific bonds, SAXS measurements in the bulk for all samples show partially ordered structures and large aggregates, indicative of additional demixing between the PIB chains and the functional groups. Hydrogen bonds obviously stabilize these aggregates, even at high temperatures as it is shown by IR spectroscopy. The rheological properties which vary strongly between different samples and depend strongly on temperature, result from the combined effect of supramolecular interaction and additional structure formation. The specificity on the hydrogen bonds seems to be lost in the bulk sample.