Publication
Study of the degradation mechanisms of polyethylene during reprocessing
| dc.contributor.author | Mendes, Ausenda | |
| dc.contributor.author | Cunha, A.M. | |
| dc.contributor.author | Bernardo, C.A. | |
| dc.date.accessioned | 2025-12-05T10:46:56Z | |
| dc.date.available | 2025-12-05T10:46:56Z | |
| dc.date.issued | 2011-06 | |
| dc.description.abstract | The present work aims at evaluating the behaviour of various grades of high and low density polyethylene subjected to continuous injection moulding operations. It is based on a wide range of experimental techniques that allowed the establishment of relationships between the observed property changes and the structural modifications developed in the polymers. The study confirmed the coexistence of two distinct degradation mechanisms, crosslinking and chain scission, that occur due to thermo-oxidative reactions arising during the different injection moulding stages. The relative importance of these two mechanisms depends on the material structure and on the processing conditions used. It was also possible to confirm that the polyethylenes with lower molecular mass show low sensitivity to degradation during reprocessing. Furthermore, the more branched polymers (as is the case of LDPE) also proved to be less sensitive to thermo-degradation phenomena. Overall, it was concluded that the primary recycling of polyethylene, if performed under well controlled conditions, will lead to only minor material property losses. | eng |
| dc.description.sponsorship | A.A. Mendes wishes to thank the PRODEP III Programme for a personal grant received in the framework of the 2/5.3/PRODEP/2000 call, Project 5.3/C/1065.001/00 (Further Training for Higher Education Institutions Staff). The authors are indebted to Dr. M.A. Queirós for many enlightening discussions throughout the prepa ration of this manuscript. | |
| dc.identifier.citation | A.A. Mendes, A.M. Cunha, C.A. Bernardo, Study of the degradation mechanisms of polyethylene during reprocessing, Polymer Degradation and Stability, Volume 96, Issue 6, 2011, Pages 1125-1133, ISSN 0141-3910, https://doi.org/10.1016/j.polymdegradstab.2011.02.015. | |
| dc.identifier.doi | 10.1016/j.polymdegradstab.2011.02.015 | |
| dc.identifier.issn | 0141-3910 | |
| dc.identifier.uri | http://hdl.handle.net/10400.8/14909 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.publisher | Elsevier BV | |
| dc.relation.hasversion | https://www.sciencedirect.com/science/article/pii/S0141391011000978 | |
| dc.relation.ispartof | Polymer Degradation and Stability | |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
| dc.subject | Plastics waste | |
| dc.subject | Primary recycling | |
| dc.subject | Reprocessing | |
| dc.subject | Polyethylene | |
| dc.subject | Degradation mechanisms | |
| dc.subject | Processing-structure–properties relationships | |
| dc.title | Study of the degradation mechanisms of polyethylene during reprocessing | eng |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 1133 | |
| oaire.citation.issue | 6 | |
| oaire.citation.startPage | 1125 | |
| oaire.citation.title | Polymer Degradation and Stability | |
| oaire.citation.volume | 96 | |
| oaire.version | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |
| person.familyName | Mendes | |
| person.givenName | Ausenda | |
| person.identifier.orcid | 0000-0003-3004-8972 | |
| person.identifier.scopus-author-id | 7102443940 | |
| relation.isAuthorOfPublication | 5ac3b700-95c6-4782-861a-deea8e449a7c | |
| relation.isAuthorOfPublication.latestForDiscovery | 5ac3b700-95c6-4782-861a-deea8e449a7c |