Heterogeneity of Accelerated Photooxidation in Stabilized Bulk Commodity Polymers Studied by X-Band ESRI
- Authors: Pilař J.1
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Affiliations:
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic
- Issue: Vol 49, No 11 (2018)
- Pages: 1217-1234
- Section: Original Paper
- URL: https://journals.rcsi.science/0937-9347/article/view/248178
- DOI: https://doi.org/10.1007/s00723-018-1042-x
- ID: 248178
Cite item
Abstract
Heterogeneity of photooxidation processes in plaques made of commodity polymers, high-density polyethylene, and cyclic olefin copolymer poly(ethylene-co-norbornene) (Topas® 8007) stabilized with various hindered amine stabilizers; some of them in combination with UV stabilizers exposed to accelerated weathering were studied using electron spin resonance imaging (ESRI) and three independent microscopic-scale methods: scanning electron microscopy, infrared microscopy, and microhardness testing. Concentration profiles of nitroxides mapping photooxidation process inside polymer plaques along the direction of incident radiation (perpendicular to the irradiated surface of the plaques) were determined by ESRI technique in dependence on the duration of the accelerated photooxidation. ESRI data were complemented with profiles of oxidation products, crystallinity, and microhardness measured inside the plaques along the same direction. Selection of stabilizers in the study was completed with α-tocopherol that is considered as the most active component of excellent processing stabilizer vitamin E.
About the authors
Jan Pilař
Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic
Author for correspondence.
Email: pilar@imc.cas.cz
ORCID iD: 0000-0002-6345-6617
Czech Republic, Prague 6, 162 06