20.500.12556/RUP-23096 Evaluation of the effectiveness of black tea leaves wastes as phytochemical-rich plant fillers and natural antioxidant in polyethylene The aim of this study is to compare the structure as well as the mechanical and thermomechanical properties of polyethylene stabilized with a petrochemical additive (Irganox 1010) and a sustainable alternative, antioxidant-rich black tea waste leaves (BTW). The influence of both stabilizers was evaluated for samples produced by compression, injection, and rotational molding (CM, INM, and RM). The polymer ma- trix used was low-density polyethylene LDPE SBC 818 I’m Green® (Braskem), modified with 5 wt% BTW and an equiva- lent amount of Irganox 1010 based on the total phenolic con- tent in BTW. Stabilization efficiency was assessed using Fourier transform infrared spectroscopy (FTIR) and calori- metric techniques, including oxidation induction time (OIT) and oxidation onset temperature (OOT), both measured by differential scanning calorimetry (DSC). Additionally, porosity, mechanical performance in static tensile testing, and Vicat softening temperature (VST) were determined to provide a comprehensive comparison of the stabilization systems. Cilj te študije je primerjati strukturo ter mehanske in termomehanske lastnosti polietilena, stabiliziranega s petrokemičnim dodatkom (Irganox 1010) in trajnostno alternativo – odpadnimi listi črnega čaja (BTW), bogatimi z antioksidanti. Vpliv obeh stabilizatorjev je bil ocenjen na vzorcih, izdelanih s kompresijskim, injekcijskim in rotacijskim oblikovanjem (CM, INM in RM). Kot polimerna matrica je bil uporabljen nizkogostotni polietilen LDPE SBC 818 I’m Green® (Braskem), modificiran s 5 mas. % BTW ter z ekvivalentno količino Irganoxa 1010 glede na skupno vsebnost fenolnih spojin v BTW. Učinkovitost stabilizacije je bila ocenjena s Fourierjevo transformacijsko infrardečo spektroskopijo (FTIR) in kalorimetričnimi metodami, vključno s časom indukcije oksidacije (OIT) in temperaturo začetka oksidacije (OOT), ki sta bila izmerjena z diferencialno dinamično kalorimetrijo (DSC). Poleg tega so bili določeni poroznost, mehanske lastnosti pri statičnem nateznem preskusu ter Vicatova temperatura zmehčanja (VST), da bi zagotovili celovito primerjavo obeh stabilizacijskih sistemov. polyethylene thermoplastics antioxidants rotational molding stabilization polietilen termoplastika antioksidanti rotacijsko brizganje stabilizacija true false true Angleški jezik Slovenski jezik Članek v reviji 2026-06-02 15:43:35 2026-06-02 15:43:38 2026-06-03 03:08:34 0000-00-00 00:00:00 2026 0 0 str. 1-12 iss. 1, [article no.] 20250099 Vol. 26 2026 0000-00-00 Zaloznikova NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2026-04-15 678.742.2:678.048 1618-7229 10.1515/epoly-2025-0099 280194819 RAZ_Aniśko-Michalak_Joanna_2026.pdf RAZ_Aniśko-Michalak_Joanna_2026.pdf 1 E8A679D73B2388EF24ABF71A8665D358 bc83157f7e0e519f1e85c035e3e600f40b45c9ba1cbb203424dcccc4590dc10c 0e63f6cb-5e89-11f1-9e8d-005056ac49c0 https://repozitorij.upr.si/Dokument.php?lang=slv&id=33745 https://www.degruyterbrill.com/document/doi/10.1515/epoly-2025-0099/html?utm_source=researchgate.net&utm_medium=article 1 efcbde6f-5e88-11f1-9e8d-005056ac49c0 https://repozitorij.upr.si/Dokument.php?lang=slv&id=33744 Inštitut Andrej Marušič 0 0 0