Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Poster: Crystallization, Nucleation and Self Assembly

CPP 19.11: Poster

Tuesday, March 12, 2013, 18:15–20:15, Poster C

Structure and Dynamics of self-healing model polymers in the melt — •Ana Rita Brás, Margarita Krutyeva, Wiebke Antonius, Claas Hövelmann, Jürgen Allgaier, Wim Pyckhout-Hintzen, Andreas Wischnewski, and Dieter Richter — Forschungszentrum Jülich, JCNS-1/ICS-1, D52425 Jülich, Germany

One fascinating aspect of a self-assembly of supramolecular polymers carrying functional endgroups is the possibility of controlling the structure, adding functionalities, adjusting the macroscopic properties and taking profit of the non-trivial dynamics associated to the reversibility of hydrogen bonds. The most recent application of these polymers is the self-healing ability. Models of such materials have been synthesized, in which appropriate end-functionalization was performed by using DNA-inspired end-groups like Thymine(Thy)(A) and Diaminotriazine (Triaz)(B). These homoditopic mixtures AA/BB build exclusively key-lock systems A-B. The pre-polymer was polyethylene(glycol)(PEG). Both, Small Angle Neutron Scattering and Neutron Spin-Echo Spectroscopy were performed in the melt allowing to quantitatively access the assembly process. The structure was described for the first time by a Random Phase Approximation generalized to multiblock copolymers consisting of H and D based hydrogen-bonded supramolecular copolymers including interactions. Moreover, it was shown that by NSE the dynamics of hydrogen bonded macromolecules can indeed be accessed. The results could be described in terms of a significantly changed mode structure of the supra-chain based on the suppression of long wavelength Rouse modes. Supported by DFG-SPP1568 and EU-Dynacop