Crystalline plasticity in isotactic polypropylene below and above the glass transition temperature

Autor(en)

G. Polt, F. Spieckermann, H. Wilhelm, Ch. Fischer, E. Schafler, S. Bernstorff, M. Zehetbauer

Abstrakt

In-situ X-ray diffraction was applied to isotactic polypropylene with a high volume fraction of α-phase (α-iPP) while it has been compressed at temperatures below and above its glass transition temperature T_g. The diffraction patterns were evaluated by the Multi-reflection X-ray Profile Analysis (MXPA) method, revealing microstructural parameters such as the density of dislocations and the size of coherently scattering domains (CSD-size). A significant difference in the development of the dislocation density was found compared to compression at temperatures above T_g, pointing at a different plastic deformation mechanism at these temperatures. Based on the individual evolutions of the dislocation density and CSD-size observed as a function of compressive strain, suggestions for the deformation mechanisms occurring below and above T_g are made.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

TGM - Technologisches Gewerbemuseum, Elettra Sincrotrone Trieste

Journal

Express Polymer Letters

Band

9

Seiten

894-900

Anzahl der Seiten

7

ISSN

1788-618X

DOI

https://doi.org/10.3144/expresspolymlett.2015.81

Publikationsdatum

10-2015

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Materials Chemistry, Allgemeine chemische Verfahrenstechnik, Polymers and Plastics, Physical and Theoretical Chemistry, Organic Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f9c59e3b-c00b-4c9f-bd91-163646688af6