Physico-chemical analysis of a silane-grafted polyethylene stabilised with an excess of Irganox 1076®. Proposal of a microstructural model

Xu, Anne; Roland, Sébastien; Colin, Xavier

doi:10.1016/j.polymdegradstab.2020.109453

Cited by 12 publications

(14 citation statements)

References 26 publications

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“…13 ), there is no longer melting peak of AO crystals on the DSC thermograms. This result is not surprising because, in our previous study [33] , it was shown that AO crystals are only present at the sample surface.…”

Section: Morphological Changes (Dsc Analysis)supporting

confidence: 58%

“…These concentrations were estimated using Eq. 2 and the calibration curve obtained for OIT at 205 °C in our previous work [33] .…”

Section: Surface Analysis (Ftir Spectroscopy In Atr Mode Vs Optical M...mentioning

confidence: 96%

“…The surface of the heterogeneously stabilised Si-XLPE films were gently cleaned with absorbing paper and acetone as polar solvent (supplied by Sigma-Aldrich) in order to remove all AO crystals present on their surface without changing the concentration of the AO dissolved in their bulk, as previously shown in reference [33] . Thanks to this surface cleaning, it was possible to deconvolve the physico-chemical responses of dissolved and crystallised AO.…”

Section: Surface Cleaning Treatmentmentioning

confidence: 99%

“…As a reminder, the material under study was stabilised by an initial concentration of Irganox 1076® above its solubility threshold (about 0.9 wt%) in PE-based materials [ 29 , 33 ]. These AO in excess exuded and recrystallized at the sample surface during the processing operation [33] .…”

Section: Surface Analysis (Ftir Spectroscopy In Atr Mode Vs Optical M...mentioning

confidence: 99%

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Thermal ageing of a silane-crosslinked polyethylene stabilised with an excess of Irganox 1076Ⓡ

Roland

Colin

2021

Polymer Degradation and Stability

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Section: Morphological Changes (Dsc Analysis)supporting

confidence: 58%

“…These concentrations were estimated using Eq. 2 and the calibration curve obtained for OIT at 205 °C in our previous work [33] .…”

Section: Surface Analysis (Ftir Spectroscopy In Atr Mode Vs Optical M...mentioning

confidence: 96%

Section: Surface Cleaning Treatmentmentioning

confidence: 99%

Section: Surface Analysis (Ftir Spectroscopy In Atr Mode Vs Optical M...mentioning

confidence: 99%

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Thermal ageing of a silane-crosslinked polyethylene stabilised with an excess of Irganox 1076Ⓡ

Roland

Colin

2021

Polymer Degradation and Stability

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“…Low-weight (molecular) antioxidants are prone to blooming, as their diffusion coefficient within the polymer is higher [9]. In a recent paper, Xu et al [10,11] studied the blooming of the molecular phenolic antioxidant Irganox 1076® at the surface of silane-crosslinked polyethylene.…”

Section: Introductionmentioning

confidence: 99%

Photostabilization of polyethylene by a hindered amine light stabilizer in blooming conditions and impact of MDO processing

Christmann

Gardette

Pichon³

et al. 2021

Polymer Degradation and Stability

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The effect of Machine Direction Orientation (MDO) processing on the photostabilization of LLDPE samples containing Tinuvin® 770 was studied. The amount of Tinuvin® 770 in the processed samples was deliberately chosen at a level higher than the reported solubility at ambient temperature for two main reasons: the first reason was to assess the equilibrium between the soluble and nonsoluble forms of this additive and the impact of the MDO process, and the second was to demonstrate the role of a higher temperature in accelerated artificial photoaging on the protective role played by the nonsoluble part. The results reported in this article show that at room temperature, a nonnegligible amount of Tinuvin® 770 precipitates at the surface, which is commonly termed blooming. However, the additive that bloomed at the surface can be dissolved within the polymer with increasing temperature, which is the case in the conditions of accelerated artificial photoaging but not the case of natural outdoor weathering. Such physical phenomena are responsible for a possible bias brought by temperature during accelerated photoaging, which can affect aging tests. This questions the representativeness of accelerated aging at higher temperatures for polymers containing a blooming stabilizer.

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Thermal aging of electrical cable insulation made of cross‐linked low density polyethylene for under‐hood application in automotive industry

Salivon

Comte

Colin

2022

Vinyl Additive Technology

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The thermal aging of two electrical cable insulations made of cross‐linked low density polyethylene (XLPE) only differing by their stabilization system was studied in air between 125 and 200°C. The chemical consumption of the two types of antioxidants (phenol and sulfide), the build‐up of oxidation products and the consequences of thermal oxidation on the mechanical properties were respectively determined by measurement of the oxidation induction time (OIT), Fourier transform infrared spectroscopy (FTIR) and uniaxial tensile testing. It was found that the chemical consumption of each antioxidant occurs in turn almost independently, starting with the sulfide antioxidant and involving small but well detectable antagonistic effects. As soon as the antioxidant concentration becomes very low, that is, practically undetectable by OIT measurements, the thermal oxidation of XLPE is detected by FTIR spectroscopy causing a catastrophic decrease in the fracture properties. It was shown that the complete consumption of antioxidants coincides with the end of the oxidation induction period and the onset of the sudden decrease in the elongation at break. Based on all these experimental results, a simplified kinetic model was developed to account as faithfully as possible for the consumption kinetics of antioxidants, evaluate their antagonistic effects and, using a relevant end‐of‐life criterion, predict the lifetime of the two XLPE insulations. It was found a satisfying agreement between theory and experiment.

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Physico-chemical analysis of a silane-grafted polyethylene stabilised with an excess of Irganox 1076®. Proposal of a microstructural model

Abstract: chemical analysis of a silane-grafted polyethylene stabilised with an excess of Irganox 1076®. Proposal of a microstructural model -

Cited by 12 publications

References 26 publications

Thermal ageing of a silane-crosslinked polyethylene stabilised with an excess of Irganox 1076Ⓡ

Thermal ageing of a silane-crosslinked polyethylene stabilised with an excess of Irganox 1076Ⓡ

Photostabilization of polyethylene by a hindered amine light stabilizer in blooming conditions and impact of MDO processing

Thermal aging of electrical cable insulation made of cross‐linked low density polyethylene for under‐hood application in automotive industry

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