Rate mechanism and dislocation generation in high density polyethylene and other semicrystalline polymers

Autor(en)

Florian Spieckermann, Harald Wilhelm, Gerald Polt, Said Ahzi, Michael Zehetbauer

Abstrakt

The aim of the paper was to use recent experimental dislocation data for the development and testing of a dislocation mediated strength model based on that introduced by Scogna and Register for semicrystalline polymers. It is shown that the model can successfully describe measured and evaluated data of high density polyethylene (PE-HD) on the flow stress as function of strain rate and temperature. Similar coincidences of model fit with experimental yield stress data from literature for polypropylene and polyethylene-ethylenemethacrylic acid co-polymers (E/MAA) were found which suggests prevailing of dislocation mediated plasticity mechanisms also in these materials. It also turned out that two parameters of the model – namely the dislocation density and the lamella size – are not determined by the molecular chemistry but by the conditions of processing and/or sample preparation. Therefore the model allows for a reliable estimation of the dependence of the yield stress on these conditions.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Université de Strasbourg, TGM - Technologisches Gewerbemuseum

Journal

Polymer

Band

55

Seiten

1217-1222

Anzahl der Seiten

6

ISSN

0032-3861

DOI

https://doi.org/10.1016/j.polymer.2014.01.020

Publikationsdatum

03-2014

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Materials Chemistry, Polymers and Plastics, Organic Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5c185363-4f51-44ef-aaf1-3be6e8725c05