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

Author(s)
Florian Spieckermann, Harald Wilhelm, Gerald Polt, Said Ahzi, Michael Zehetbauer
Abstract

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(s)
Physics of Nanostructured Materials
External organisation(s)
Université de Strasbourg, TGM - Technologisches Gewerbemuseum
Journal
Polymer
Volume
55
Pages
1217-1222
No. of pages
6
ISSN
0032-3861
DOI
https://doi.org/10.1016/j.polymer.2014.01.020
Publication date
03-2014
Peer reviewed
Yes
Austrian Fields of Science 2012
103023 Polymer physics, 103018 Materials physics
Keywords
ASJC Scopus subject areas
Materials Chemistry, Polymers and Plastics, Organic Chemistry
Portal url
https://ucris.univie.ac.at/portal/en/publications/rate-mechanism-and-dislocation-generation-in-high-density-polyethylene-and-other-semicrystalline-polymers(5c185363-4f51-44ef-aaf1-3be6e8725c05).html