Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 58: Polymer Dynamics II

CPP 58.4: Vortrag

Freitag, 4. April 2014, 10:30–10:45, ZEU 114

Structure and Dynamics of Supramolecular Polymers by Neutron Scattering — •Ana R. Brás, Margarita Krutyeva, Claas Hövelmann, Wiebke Antonius, Jürgen Allgaier, Wim Pyckhout-Hintzen, Andreas Wischnewski, and Dieter Richter — Forschungszentrum Jülich, JCNS-1/ICS-1, D52425 Jülich, Germany

Supramolecular polymers allow a specific tailoring of polymer properties. A recent addition are self-healing polymers, displaying hydrogen-bonding interaction. The conformation and dynamics of self-healing model telechelic polymers, consisting of polypropylene glycol (PPG) end-functionalized with hydrogen-bonded associating groups was investigated by means of Small Angle Neutron Scattering (SANS) and Neutron Spin Echo (NSE) spectroscopy. SANS in deuterated toluene confirmed a linear conformation of the studied system. The scattering data were examined using an RPA model approach, usually applied to pure polymer systems. It revealed a reasonably description of the SANS data. More, it underlined the importance of chemical interactions between the components. NSE performed under the same conditions, revealed that the dynamics slowed down upon association. The NSE data were analyzed in terms of a modified Zimm model for polymer dynamics in solution taking into account an additional internal friction originating from the hydrogen-bonded groups. It was unambiguously proven that dynamic neutron scattering is probing the association by H-bonding mechanism. For the first time such an association process in solution was observed by quasielastic neutron scattering. Supported by DFG-SPP1568.