Dresden 2017 – wissenschaftliches Programm
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. ), 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 Sxx≈ 0.9±0.1 for the crystalline c-axes (). The amorphous polymer backbones exhibit a lower, Sxx< 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.