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AuthorLuyt, A. S.
AuthorGasmi, S. A.
AuthorMalik, S. S.
AuthorAljindi, R. M.
AuthorOuederni, M.
AuthorVouyiouka, S. N.
AuthorPorfyris, A. D.
AuthorPfaendner, R.
AuthorPapaspyrides, C. D.
Available date2022-04-17T09:47:33Z
Publication Date2021
Publication NameExpress Polymer Letters
ResourceScopus
Identifierhttp://dx.doi.org/10.3144/expresspolymlett.2021.12
URIhttp://hdl.handle.net/10576/29899
AbstractAccelerated (artificial) weathering and thermal aging tests were performed to investigate the effectiveness of different formulations in reducing the UV/heat degradation extent for two low-density polyethylene types (LDPE-A, LDPE-T). The two LDPEs differ in the type and extent of branching due to the applied polymerization process, with LDPE-A being produced in an autoclave and LDPE-T in a tubular reactor. Oligomeric or high molecular weight hindered amine light stabilizer (HALS), and two UV absorbers of benzophenone or hydroxyphenyl-triazine types were equally introduced to both the LDPE grades at a total content of 0.2 wt%. The surface morphology, as well as thermal and mechanical properties, were examined during aging showing a significant degradation extent for the neat samples. In particular, a mechanism of chain scission/branch-ing that resulted in crosslinking was assumed for the neat polyethylenes, after combining the decrease of molecular weight observed in the GPC analysis with the increase in Young's modulus after UV exposure. LDPE-T presented higher photo-ox-idation rates due to its comb-like branched structure and its higher possibility of intermolecular reactions between adjacent chains. Little or no degradation was observed for the stabilized grades, confirming the effectiveness of the selected UV/heat systems in improving the weathering resistance of the two LDPE grades and enhancing their useful lifetime.
SponsorThis publication was made possible by the NPRP award (NPRP 9-161-1-030) from the Qatar National Research Fund (a member of The Qatar Foundation). We are also grateful to BASF and Sabo for supplying the additives at no cost. The statements made herein are solely the responsibility of the author(s).
Languageen
PublisherBME-PT and GTE
SubjectDegradation
Low-density polyethylene
Processing technologies
UV/heat stabilization
TitleArtificial weathering and accelerated heat aging studies on low-density polyethylene (Ldpe) produced via autoclave and tubular process technologies
TypeArticle
Pagination121-136
Issue Number2
Volume Number15
dc.accessType Abstract Only


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