Dresden 2017 – wissenschaftliches Programm
CPP 48.2: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P2-OG1
NMR investigations of dynamics in the different phases of semicrystalline polymers — •Mareen Schäfer, Ricardo Kurz, Martha Schulz, Anne Seidlitz, Thomas Thurn-Albrecht, and Kay Saalwächter — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle (Saale), Germany
The melt-crystallized morphology of semicrystalline polymers strongly depends on the diverse dynamics in the amorphous and crystalline region. The connections between structure formation and dynamics of polymer chains are investigated with SAXS and NMR spectroscopy, respectively, and polymers with and without intracrystalline dynamics (crystal-mobile and crystal-fixed) are compared. Proton time-domain techniques enable the analysis of the phase components, the intracrystalline and the amorphous phase dynamics. The intracrystalline motion displays only a weak dependence on morphology. SAXS results show that the morphology of the crystal-fixed polymer, poly-є -caprolactone (PCL), and the crystal-mobile polymer, polyethylene oxide (PEO), are qualitatively different. The crystal thicknesses in PCL are well-defined whereas in PEO a crystal reorganization process caused by the intracrystalline dynamics leads to a uniform amorphous region. To investigate the impact of the crystalline growth and reorganization process on the morphology separately, polymers with slower intracrystalline mobility, e.g. polyoxymehtylene (POM), will be investigated. Further investigations address the relationship between morphology and entangled dynamics in the amorphous phase.