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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Nanostructures, Nanostructuring and Nanosized Soft Matter

CPP 37.4: Talk

Wednesday, March 29, 2023, 15:45–16:00, MER 02

Molecular dynamics of superglassy polymers for gas separation by neutron scattering, dielectric spectroscopy, and calorimetry — •Paulina Szymoniak¹, Mohamed Aejaz Kolmangadi¹, Reiner Zorn², and Andreas Schönhals¹ — ¹Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany — ²Forschungszentrum Jülich, Jülich Centre for Neutron Science, Jülich, Germany

Janus polytricyclononenes (PTCN) with rigid backbones and flexible n-alkyl (n=propyl-decyl) are innovative materials that show potential in separating hydrocarbons. These superglassy polymers were designed to show an enhanced, controllable gas permeability via flexible alkyl side chains. PTCNs show nanophase separation between the alkyl side chains and the backbones with a distinct α-relaxation of the alkyl-rich nanophase found by broadband dielectric spectroscopy and temperature modulated DSC. Further, Janus PTCNs were studied by quasielastic neutron scattering (QENS) employing backscattering and time of flight instruments. For an overview of dynamic processes inelastic fixed window scans were performed showing segmental motions of alkyl-rich nanodomains and an additional low temperature relaxation, assigned to methyl group rotations. The molecular mobility was extracted from a combined analysis of backscattering and time of flight QENS data. The glass transition of the backbone-rich domains, which is beyond or near to the degradation of the materials, was evidenced by fast scanning calorimetry by decoupling it from decomposition, employing high heating rates.