Journal
POLYMER DEGRADATION AND STABILITY
Volume 121, Issue -, Pages 378-384Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2015.10.005
Keywords
Photoluminescence; Degradation; Polyolefins; Liquid chromatography; Mass spectrometry
Categories
Funding
- Austrian Climate and Energy Fund (KLI:EN) [SolPol 4/5]
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In the present work, we focused on the aging behavior of stabilized and unstabilized polyolefins using the solvent squalane as a polypropylene-mimicking model. It was found that squalane as well as polypropylene show aging-induced photoluminescence emissions at elevated temperatures. To separate and identify the photoluminescent species from other aging-induced degradation products, a high performance liquid chromatography method using photoluminescence detection (lambda(Ex) = 375 nm, lambda(Em) = 410 nm) was developed. Comparison of the integrated photoluminescence intensities allowed performing a stabilizer efficacy rating of different squalane-antioxidant formulations. For characterization and structure elucidation of the photoluminescent degradation products, the liquid chromatogaphic method was adapted for coupling to a high resolution Orbitrap mass spectrometer. It was possible to assign the observed masses to (multiple) unsaturated carbonyl compounds, which is in accordance to previous investigations. (C) 2015 Elsevier Ltd. All rights reserved.
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