Grafting functional antioxidants on highly crosslinked polyethylene

Al-Malaika, Sahar, Riasat, Selma and Lewucha, Cezary Grafting functional antioxidants on highly crosslinked polyethylene. IN: VIII International Conference on “Times of Polymers and Composites”. d’Amore, Alberto; Acierno, Domenico and Grassia, Luigi (eds) AIP Conference Proceedings. . AIP.

Abstract

The problem of interference of antioxidants, such as hindered phenols, with peroxide-initiated crosslinking of polyethylene was addressed through the use of functional (reactive) graftable antioxidants (g-AO). Reactive derivatives of hindered phenol and hindered amine antioxidants were synthesised, characterised and used to investigate their grafting reactions in high density polyethylene; both non-crosslinked (PE) and highly peroxide-crosslinked (PEXa). Assessment of the extent of in-situ grafting of the antioxidants, their retention after exhaustive solvent extraction in PE and PEXa, and the stabilising performance of the grafted antioxidants (g-AO) in the polymer were examined and benchmarked against conventionally stabilised crosslinked & non-crosslinked polyethylene. It was shown that the functional antioxidants graft to a high extent in PEXa, and that the level of interference of the g-AOs with the polymer crosslinking process was minimal compared to that of conventional antioxidants which bear the same antioxidant function. The much higher level of retention of the g-AOs in PEXa after exhaustive solvent extraction, compared to that of the corresponding conventional antioxidants, accounts for their superior long-term thermal stabilising performance under severe extractive conditions.

Publication DOI: https://doi.org/10.1063/1.4949576
Divisions: Engineering & Applied Sciences > Chemical engineering & applied chemistry
Engineering & Applied Sciences > Polymer Processing and Performance Research Unit
Engineering & Applied Sciences > Polymer and advanced materials research group
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Additional Information: -
Event Title: 8th International Conference on Times of Polymers and Composites
Event Type: Other
Event Dates: 2016-06-19 - 2016-06-23
Uncontrolled Keywords: crosslinked polyethylene,Functional antioxidants,Long term thermal stability,Physics and Astronomy(all)

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