Abstract
In recent decades several studies addressed the chemical consumption of primary antioxidants in polyolefins, however a generally accepted spectroscopic method to investigate the aging products of phenolic antioxidants separately from the aging products of PE have not been published. To address this issue FTIR-transmission spectra of chlorine dioxide aged PE cross-section samples were evaluated with principal component analysis (PCA). A decrease in the hydroxyl groups parallel to the increase of quinone groups with increasing aging time were observed. This indicates that the evaluation of FTIR-transmission spectra with PCA enables the monitoring of hindered phenolic antioxidants with the decrease of non-aged hydroxyl groups (∼3650 cm−1) and with the increase of quinone groups (∼1600 and 1640 cm−1) separately from the aging products of PE. Besides the qualitative analysis, conclusion regarding the relative amount of active AO molecules in given distance from the aging surface or after a certain aging time can be obtained with the aid of PCA.
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