Antioxidant activity in aluminium oxide – poly(ethylene-co-butyl acrylate) nanocomposites

Nawaz, Sohail; Nordell, Patricia; Hillborg, Henrik; Gedde, Ulf W.

doi:10.1016/j.polymdegradstab.2012.03.012

Cited by 16 publications

(14 citation statements)

References 32 publications

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“…Here, it is important to note the error margins for the OIT values, which is ±2 min, resulting in almost the same OIT values for REF and 'A' samples. The thermal stability values are compared to the breakdown strengths for wet samples as materials studied in [9] were not thoroughly dried prior to the experiment. The trend for the higher breakdown strength for higher thermal stability of the materials is quite plausible as a breakdown is associated with local heat generation.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal stability assessment was based on estimation of the concentration of effective antioxidant in the materials, which in turn was characterized by oxidation induction time (OIT) [9]. The comparison was based on initial OIT values for nondried materials.…”

Section: Oit Measurementsmentioning

confidence: 99%

“…Full description of the OIT measurements can be found in [9], here only a short summary will be presented. MettlerToledo DSC-820 was used for measuring OIT on unconditioned samples.…”

Section: Oit Measurementsmentioning

confidence: 99%

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Dielectric breakdown strength of alumina filled poly (ethylene-co-butyl acrylate) nanocomposites

Jaeverberg

Venkatesulu

Edin

2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Abstract-Dielectric breakdown strength of poly (ethylene-cobutyl acrylate) (EBA) nanocomposites filled with spherical alumina particles was studied as a function of particle coating and relative air humidity. The nanocomposites were prepared from a mixture of EBA formulations (13 wt% butyl acrylate groups content) and alumina powder. The particles were either unmodified or surface-treated with aminopropyltriethoxy silane or octyltriethoxy silane. The filler content studied was 6 wt%. Every material formulation was thoroughly examined under SEM in order to verify homogeneous particle dispersion. Two different relative humidities of air were used for conditioning the samples prior to testing: 0 and 86 % RH.The dielectric breakdown strength measurements were performed with a DC ramp of 1.2 kV/s. Ten samples were tested for each material formulation. Results were compared to the pristine EBA samples. Applying Weibull analysis to the measured data indicated a slight increase in breakdown strength for the dry nanocomposites filled with amino-treated particles as compared to the reference material in dry conditions. As expected, conditioning materials in humid environment had a negative impact on breakdown strength. This effect was more pronounced for nanocomposite materials, while the reference unfilled material was affected the least.

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Section: Resultsmentioning

confidence: 99%

Section: Oit Measurementsmentioning

confidence: 99%

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Dielectric breakdown strength of alumina filled poly (ethylene-co-butyl acrylate) nanocomposites

Jaeverberg

Venkatesulu

Edin

2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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“…The corresponding large-area multi-breakdown distributions for each film type are: (a) Figure 2d Total particle area fraction = 4.73 % Total particle area fraction = 7.62 % Total particle area fraction = 2.49 % Total particle area fraction = 3.06 % Total particle area fraction = 2.37 % dependence on Irgafos 168 content is less prominent with the 4.5 wt-% SiO 2 -BOPP variants which points towards possible interaction mechanism between silica and antioxidants. For example, a study by Nawaz et al [14] suggests that a substantial amount of antioxidants can be adsorbed on the filler surfaces. Initial antioxidant adsorption on the nanofiller surfaces, film processing and the possible slow-release of the antioxidant residue from the adsorption sites over time may have an influence on both the short-and long-term breakdown performance of the end-product and should be investigated further in the future.…”

Section: Large-area Multi-breakdown Resultsmentioning

confidence: 99%

The Role of Film Processing in the Large-Area Dielectric Breakdown Performance of Nano-Silica-BOPP Films

Rytöluoto

Ritamäki

Karttunen³

2017

NORD-IS

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This paper summarizes the effects of various compositional, structural and film processing factors on the breakdown behavior of laboratory-and pilot-scale melt-compounded bi-axially oriented polypropylene (BOPP) nanocomposite films with silica fillers. A selfhealing multi-breakdown measurement approach has been extensively utilized for large-area breakdown characterization of a large number of material variants from different processing trials. The results suggest that although the optimum level of silica presumably resides at the low fill-fraction range (~1 wt-%), the silica content itself is not the only determining factor, as compounds with equal silica content were found to exhibit large differences in the breakdown properties depending on the compounding and film processing steps. Dispersion quality and filler agglomeration (in both the nm-and µm-scale) appear to be of great importance. Indications of possible interaction between nano-silica and co-stabilizer Irgafos 168 are also presented. Overall, the laboratory-and pilot-scale film processing trials suggest that up-scaling of the polymer nanocomposite production is sensible with traditional melt-blending technology, although further development and optimization of nanocomposite formulations and processing is necessary.

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“…Further, the interaction between the antioxidants and the nanofillers should also be considered, as a substantial amount of antioxidant may be adsorbed on the filler surfaces as discussed e.g. in the case of poly(ethylene-co-butyl acrylate)-Al 2 O 3 nanocomposites and Irganox 1010 in [15]. Initial antioxidant adsorption on the nanofiller surfaces, film processing and the possible slow-release of the antioxidant residue from the adsorption sites over time may have an influence on both the short-and long-term breakdown performance of the end-product, and should be investigated further in the future.…”

Section: Discussionmentioning

confidence: 99%

Influence of low amounts of nanostructured silica and calcium carbonate fillers on the large-area dielectric breakdown performance of bi-axially oriented polypropylene

Rytöluoto

Karttunen

Koponen³

et al. 2014

2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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-Influence of low amounts (1.0-2.0wt-%) of nanostructured silica and calcium carbonate fillers on the largearea dielectric breakdown performance of bi-axially oriented polypropylene (BOPP) is analyzed. A multi-breakdown measurement method based on the self-healing breakdown capability of metallized film is utilized for the breakdown characterization in order to cover relatively large total film areas, thus leading to results of higher relevance from the practical point-of-view. The dispersion and distribution qualities of filler particles at the nanoscale are evaluated with transmission electron microscopy (TEM) imaging. Weibull statistical analysis suggests that the breakdown distribution homogeneity can be improved with both the filler types. The 1.0wt-% silica-BOPP composite also shows a shift of the weakest points towards higher dielectric strength in comparison to the neat BOPP. However, with increasing filler content, new failure modes are introduced into the nanocomposites, hence decreasing the overall breakdown performance in the >5% breakdown probability region in comparison to the un-filled reference BOPP film.

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Antioxidant activity in aluminium oxide – poly(ethylene-co-butyl acrylate) nanocomposites

Cited by 16 publications

References 32 publications

Dielectric breakdown strength of alumina filled poly (ethylene-co-butyl acrylate) nanocomposites

Dielectric breakdown strength of alumina filled poly (ethylene-co-butyl acrylate) nanocomposites

The Role of Film Processing in the Large-Area Dielectric Breakdown Performance of Nano-Silica-BOPP Films

Influence of low amounts of nanostructured silica and calcium carbonate fillers on the large-area dielectric breakdown performance of bi-axially oriented polypropylene

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