Evidence of dislocations in melt-crystallised and plastically deformed polypropylene

Autor(en)

Harald Wilhelm, A Paris, Erhard Schafler, Sigrid Bernstorff, J Bonarski, Tamas Ungar, Michael Zehetbauer

Abstrakt

In view of the lack of other methods in the study of melt-crystallised polymers, this paper reports the application of a new kind of X-ray diffraction profile analysis to investigate dislocations in various plastically deformed ?-phase isotactic polypropylene (?-PP). By means of a two-step evaluation it is shown that dislocations are present in ?-PP and that their density increases with plastic deformation. Compared with metals, very high dislocation densities between 2×1016 and 2.2×1017 m-2 are evaluated which might result to some extent from the presence of uncorrelated lattice defects in the interface between crystalline and amorphous phase. It is shown, however, that the measured dislocation densities are consistent with the assumption that the mean free path of dislocations equals the lamella thickness. Œ 2004 Elsevier B.V. All rights reserved.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Universität Wien, Elettra Sincrotrone Trieste, Polish Academy of Sciences (PAS), Eötvös Loránd University Budapest, TGM - Technologisches Gewerbemuseum

Journal

Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing

Band

387-389

Seiten

1018-1022

Anzahl der Seiten

5

ISSN

0921-5093

DOI

https://doi.org/10.1016/j.msea.2004.03.099

Publikationsdatum

2004

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/deba95f1-f780-414e-b52b-a3c898d7fe39