Summary
The polypropylene additives were extracted by dissolution-precipitation and Soxhlet. The Soxhlet method was adapted for the extraction of phosphorous antioxidants. The RP HPLC method with quaternary gradient elution separated five chemical groups of additives: lower molecular mass di-tert-butyl phenol (D.T.B.P.), hindered amine light stabilizers (Tinuvin 326), hindered phenolic antioxidants (Irganox 1010) and phosphorous antioxidants (Irgafos 168 and Ultranox 626) with their degradation products.
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El Mansouri, H., Yagoubi, N. & Ferrier, D. Extraction of polypropylene additives and their analysis by HPLC. Chromatographia 48, 491–496 (1998). https://doi.org/10.1007/BF02466639
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DOI: https://doi.org/10.1007/BF02466639