Identifying active and degraded phenolic antioxidants in aged PE with IR-microscopy

Bredács, Márton; Kanatschnig, E.; Frank, Andreas; Pinter, Gerald; Gergely, Szilveszter

doi:10.1016/j.polymdegradstab.2023.110345

Polymer Degradation and Stability

2023

DOI: 10.1016/j.polymdegradstab.2023.110345

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Identifying active and degraded phenolic antioxidants in aged PE with IR-microscopy

Márton Bredács

E. Kanatschnig

Andreas Frank

et al.

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Cited by 8 publications

References 77 publications

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Feasibility study on the production of low melt flow rate recycled polypropylene from postconsumer waste

Geier,

Barretta,

Hinczica

et al. 2024

J of Applied Polymer Sci

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Polypropylene (PP) recyclates face limitations in their use due to lower qualities compared with virgin PP, resulting from contaminations and the mixing of different PP grades. In particular, their high melt flow rate (MFR) hinders their suitability for applications requiring low MFR, such as pipes. This study investigates the feasibility of producing low MFR PP recyclates from packaging waste. For this purpose, recyclates were produced exclusively from manually sorted extrusion blow molding grades and compared with a recyclate derived from a conventional PP waste stream. Different washing temperatures and recyclate production processes were used to study their effects on the properties of the recyclates. The main objective was to determine the lowest achievable MFR and the rheological, mechanical, and thermal properties of the recyclates from improved sorting. The results are intended to serve as reference points for the evaluation of future automatic sorting trials. The enhanced sorting resulted in an 80% reduction in the MFR and improved ductility, thereby extending the potential applications of the recyclate. The different washing and production processes did not have a significant effect on the investigated properties, except for a slight decrease in the MFR with hot washing and the omission of the pelletizing step.

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Feasibility study on the production of low melt flow rate recycled polypropylene from postconsumer waste

Geier,

Barretta,

Hinczica

et al. 2024

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

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Deterioration of Polypropylene Random Copolymer Formulations Based on Phenolic Antioxidants and Non‐Phenolic Stabilizers at Elevated Temperatures in Hot Air

Peham,

Wallner,

Nitsche

2024

J of Applied Polymer Sci

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This article deals with the hot air aging behavior of polypropylene random copolymers additivated with phenolic antioxidants, hindered amine light stabilizers (HALS) and thiosynergists in a wide temperature range from 65°C to 135°C. Various stabilizer mixtures and their interactions were evaluated. To avoid diffusion‐limited oxidation effects, 100 μm thick specimens were prepared from injection molded sheets and examined by Fourier‐transform infrared spectroscopy in transmission mode and tensile testing. In addition to ultimate strain‐at‐break, the aging indicators phenol index (PI), nitroxide index (NI), and ester index (EI) were deduced. Monitoring the phenolic functional groups revealed the formation of splitting‐off derivatives which remained beyond full embrittlement of the micro‐specimen at a relative content of app. 20%. Oxidation of the phenolic stabilizer Irganox 1330 resulted in shifts of the IR‐band associated with single‐ and dual‐oxidized products. Gaussian fitting of the triple peak confirmed the formation of these splitting‐off derivatives. The combination of phenolic antioxidants with HALS led to a significantly faster decay of the phenolic groups. However, this effect was reduced by the addition of thiosynergists. Interestingly, a slower decrease of the phenol, nitroxide and ester indexes representing phenolic‐, amine‐ and thio‐stabilizers, respectively, was ascertained for the PP‐R formulation with the ternary additive mixture leading to higher endurance times by a factor of up to 2.5. The analytical aging indicators did not reflect the time‐to‐embrittlement, especially for complex additive formulations containing HALS.

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Towards circular plastics: Density and MFR prediction of PE with IR spectroscopic techniques

Bredács

Geier

Horvath³

et al. 2023

Polymer Testing

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Identifying active and degraded phenolic antioxidants in aged PE with IR-microscopy

Cited by 8 publications

References 77 publications

Feasibility study on the production of low melt flow rate recycled polypropylene from postconsumer waste

Feasibility study on the production of low melt flow rate recycled polypropylene from postconsumer waste

Deterioration of Polypropylene Random Copolymer Formulations Based on Phenolic Antioxidants and Non‐Phenolic Stabilizers at Elevated Temperatures in Hot Air

Towards circular plastics: Density and MFR prediction of PE with IR spectroscopic techniques

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