Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 70: Crystallization, Nucleation and Self-Assembly II
CPP 70.10: Vortrag
Donnerstag, 15. März 2018, 17:45–18:00, C 230
Temperature-dependent IR-transition moment orientational analysis applied to thin supported films of poly-є-caprolactone — •Wilhelm Kossack1, Martha Schulz2, Thomas Thurn-Albrecht2, Jörg Reinmuth1, Viktor Skokow1, and Friedrich Kremer1 — 1Molecular Physics department, Peter Debye Institut für weiche Materie, University Leipzig, Linnéstraße 5, 04103 Leipzig — 2Martin-Luther-Universität Halle-Wittenberg, Institut für Physik, FG Experimentelle Polymerphysik, 06120 Halle/Saale, Germany
Based on temperature dependent orientational infrared spectroscopy (Infrared Transition Moment Orientational Analysis), the three dimensional molecular order parameter tensors of IR-active transition dipole moments with respect to the sample coordinate system are determined during melting of Poly-є-caprolcatone. Crystallinity and macroscopic order remain largely unaltered up to T ∼ 50 ∘C, above which they decline. This decrease reflects the melting of flat on crystalline lamellae, contributing about 34% to the crystalline material. The remaining crystallites are arranged as in two-dimensionally confined bulk-like spherulites, which melt by less than (3±3)%. Consequently, flat on oriented lamellae are regarded kinetically favoured during confined melt crystallization, but thermo-dynamically less stable than spherulites.