Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: Focus: Polymer Crystallization - from Model Systems to New Materials II

CPP 40.3: Vortrag

Mittwoch, 22. März 2017, 15:45–16:00, ZEU 222

Molecular order in strain-recrystallized Poly-Caprolactone — •Wilhelm Kossack¹, Anne Seidlitz², Thomas Thurn-Albrecht², and Friedrich Kremer¹ — ¹Universität Leipzig, Molecular Physics, 04103 Leipzig, Germany — ²Universität Halle-Wittenberg, Experimentelle Polymerphysik, 06120 Halle/Saale, Germany

Biaxial order in free standing films of Poly-є-Caprolactone is induced by plastic deformation and concomitant re-crystallization. The three-dimensional orientation distribution is studied by Infrared transition moment orientational analysis (IR-TMOA) and X-ray diffraction (pole figure) measurements. The former method senses the alignment of amorphous moieties and crystal directions (eg. [001]), whereas the latter technique reveals the order of the (200)- and (110)-crystal-planes. The main chains of the polymers are aligned with the stretching direction, leading to a strong uniaxial order with an order parameter (Hermans orientation function) of S_xx≈ 0.9±0.1 for the crystalline c-axes ([001]). The amorphous polymer backbones exhibit a lower, S_xx< 0.7, slightly biaxial order. Furthermore, changes in the XRD-diffractograms and IR-spectra upon stretching indicate strained lamellar crystallites and a reduction of crystallinity upon stretching.