Physics Seminar: Dr. Wiebke Sager

Centre for Computational Physics

Date: Monday 10th of June, 13:00.
Location: DCB1104 (David Chiddick Building, #19).

‘Standing up and peeling off of nanosized shish-kebab structures formed in melt-spun high density polyethylene and nylon 6/clay nanohybrid fibres’

by Wiebke F. C. Sager, Peter Grünberg Institute, Forschungszentrum Jülich, Germany.

Abstract:

Shish-kebab structures are known to develop after cessation of flow from semicrystalline polymer melts and/or upon uniaxial drawing in the processing of polymer films and fibres. The prenucleating shish is commonly assumed to align with the flow direction inducing orthogonal crystallisation of kebab-forming folded chain lamellae. Here we combine results from transmission electron microscopy (TEM), wide angle X-ray diffraction (WAXD) and/or small angle X-ray scattering (SAXS) to follow the microstructural evolution of the fibres upon drawing. For the high density polyethylene (HDPE) fibres we evidence for the first time a horizontal alignment of the main part of the shish-kebab nanostructures and therewith a…

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