Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 41: Crystallization, Nucleation and Self-Assembly
CPP 41.5: Vortrag
Donnerstag, 8. September 2022, 16:15–16:30, H39
How the competition between crystal growth and intracrystalline chain diffusion determines the lamellar thickness in semicrystalline polymers — Martha Schulz, Mareen Schäfer, Kay Saalwächter, and •Thomas Thurn-Albrecht — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle
The non-equilibrium thickness of lamellar crystals in semicrystalline polymers varies significantly between different polymer systems and depends on the crystallization
temperature Tc. There is currently no consensus on the mechanism of thickness selection. Previous work has highlighted the decisive role of intracrystalline chain diffusion (ICD) in special cases, but a systematic dependence of lamellar thickness on relevant timescales such as that of ICD and stem attachment has not yet been established. Studying the morphology by small-angle X-ray scattering and the two timescales by NMR methods and polarization microscopy, we present data on poly(oxymethylene), a case with relatively slow ICD. It fills the gap between previously studied cases of absent and fast ICD, enabling us to establish a quantitative
dependence of lamellar thickness on the competition between the noted timescales.
Ref. Nature Communications, 13.1 (2022): 1-10.