Interactions between a phenolic antioxidant, moisture, peroxide and crosslinking by-products with metal oxide nanoparticles in branched polyethylene

Liu, Dongming; Pourrahimi, Amir Masoud; Pallon, Love K. H.; Sánchez, Carmen Cobo; Olsson, Richard T.; Hedenqvist, Mikael S.; Fogelström, Linda; Malmström, Eva; Gedde, Ulf W.

doi:10.1016/j.polymdegradstab.2015.12.014

Cited by 37 publications

(33 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surprisingly, the dielectric constant, ε of the NE/Ti shows quite different trends, especially for the concentration amount of titanium dioxide at 0.1 and 1.0 g/L. Although the presences of the hydroxyl group on the surface of particles or the impurities, such as polar species, can affect the polarization, it can be minimized by pre-heat treatment during sample preparation [25,26]. Therefore, the apparent polarization in this study is the summation of the polarization of the base oil, inner polarization of nanoparticles and orientation polarization of charged nanoparticles as polar molecules due to Miao et al [27].…”

Section: Frequency Dielectric Response (Fds) Resultsmentioning

confidence: 98%

“…For semiconductive and dielectric nanofluids, reduction and overlapping of the interfacial zone space does not affect the dielectric response much because they can attract and trap electrons in shallow traps, as well as having very low conductivity values [20,34]. Nevertheless, if impurities exist on the particle surface, they play an important role in the mechanism, increasing the electrical conductivity of the base material [25]. Figure 8 illustrates the electric displacement field and current density distributions in the nanofluid with the influence of nanoparticle properties using finite element analysis (FEA) between two plane electrodes.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Conductive and Semi-Conductive Nanoparticles on the Dielectric Response of Natural Ester-Based Nanofluid Insulation

et al. 2018

View full text Add to dashboard Cite

Nowadays, studies of alternative liquid insulation in high voltage apparatus have become increasingly important due to higher concerns regarding safety, sustainable resources and environmentally friendly issues. To fulfil this demand, natural ester has been extensively studied and it can become a potential product to replace mineral oil in power transformers. In addition, the incorporation of nanoparticles has been remarkable in producing improved characteristics of insulating oil. Although much extensive research has been carried out, there is no general agreement on the influence on the dielectric response of base oil due to the addition of different amounts and conductivity types of nanoparticle concentrations. Therefore, in this work, a natural ester-based nanofluid was prepared by a two-step method using iron oxide (Fe 2 O 3 ) and titanium dioxide (TiO 2 ) as the conductive and semi-conductive nanoparticles, respectively. The concentration amount of each nanoparticle types was varied at 0.01, 0.1 and 1.0 g/L. The nanofluid samples were characterised by visual inspection, morphology and the dynamic light scattering (DLS) method before the dielectric response measurement was carried out for frequency-dependent spectroscopy (FDS), current-voltage (I-V), and dielectric breakdown (BD) strength. The results show that the dielectric spectra and I-V curves of nanofluid-based iron oxide increases with the increase of iron oxide nanoparticle loading, while for titanium dioxide, it exhibits a decreasing response. The dielectric BD strength is enhanced for both types of nanoparticles at 0.01 g/L concentration. However, the increasing amount of nanoparticles at 0.1 and 1.0 g/L led to a contrary dielectric BD response. Thus, the results indicate that the augmentation of conductive nanoparticles in the suspension can lead to overlapping mechanisms. Consequently, this reduces the BD strength compared to pristine materials during electron injection in high electric fields.

show abstract

Section: Frequency Dielectric Response (Fds) Resultsmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Influence of Conductive and Semi-Conductive Nanoparticles on the Dielectric Response of Natural Ester-Based Nanofluid Insulation

et al. 2018

View full text Add to dashboard Cite

show abstract

“…By comparing Figure 12a (reference NR sample with microfillers) with Figure 12b (sample with BaTiO 3 nanoparticles) it is deduced that a better dispersion of the particles produces perforations with smoother and more uniform edges. Then, the presence of nanoparticles also improves the electric field distribution within the polymeric matrix [50], thus enhancing the dielectric properties and the electric field strength at breakdown. Thus, it is of critical importance to achieve an excellent dispersion of all fillers during the production stages.…”

Section: Dielectric Testsmentioning

confidence: 99%

Improvement of insulation effectiveness of natural rubber by adding hydroxyl-functionalized barium titanate nanoparticles

González

Riba

Custal³

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

“…The hydroxyl groups on the surface of the star-shaped ZnO particles were completely removed after heat treatment [21].…”

Section: Figs 19 and 20mentioning

confidence: 99%

“…This suggests that the heat-treated ZnO particles absorbed no water [21], and that the water-assisted complexation of biodiesel on these particles did not occur.…”

Section: Figs 19 and 20mentioning

confidence: 99%

Effects of ageing conditions on degradation of acrylonitrile butadiene rubber filled with heat-treated ZnO star-shaped particles in rapeseed biodiesel

Akhlaghi

Pourrahimi

Sjöstedt

et al. 2017

Polymer Degradation and Stability

Self Cite

View full text Add to dashboard Cite

Effects of ageing conditions on degradation of acrylonitrile butadiene rubber filled with heattreated ZnO star-shaped particles in rapeseed biodiesel. Polymer degradation and stabilityAccess to the published version may require subscription. N.B. When citing this work, cite the original published paper. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT1 AbstractThe degradation of acrylonitrile butadiene rubber (NBR) after exposure to biodiesel at different oxygen partial pressures in an automated ageing equipment at 80 °C, and in a high-pressure autoclave at 150 °C was studied. The oxidation of biodiesel was promoted by an increase in oxygen concentration, resulting in a larger uptake of fuel in the rubber due to internal cavitation, a greater decrease in the strainat-break of NBR due to the coalescence of cavity, and a faster increase in the crosslinking density and carbonyl index due to the promotion of the oxidation of NBR. During the high-temperature autoclave ageing, less fuel was absorbed in the rubber, because the formation of hydroperoxides and acids was impeded. The extensibility of NBR aged in the autoclave decreased only slightly due to the cleavage of rubber chains by the biodiesel attack. The degradation of NBR in the absence of carbon black was explained as being due to oxidative crosslinking. The dissolution of ZnO crystals in the acidic components of biodiesel was retarded by removing the inter-particle porosity and surface defects through heat treating star-shaped ZnO particles. The rubber containing heat-treated ZnO particles swelled less in biodiesel than a NBR filled with commercial ZnO nanoparticles, and showed a smaller decrease in the strain-at-break and less oxidative crosslinking.

show abstract

Interactions between a phenolic antioxidant, moisture, peroxide and crosslinking by-products with metal oxide nanoparticles in branched polyethylene

Cited by 37 publications

References 59 publications

Influence of Conductive and Semi-Conductive Nanoparticles on the Dielectric Response of Natural Ester-Based Nanofluid Insulation

Influence of Conductive and Semi-Conductive Nanoparticles on the Dielectric Response of Natural Ester-Based Nanofluid Insulation

Improvement of insulation effectiveness of natural rubber by adding hydroxyl-functionalized barium titanate nanoparticles

Effects of ageing conditions on degradation of acrylonitrile butadiene rubber filled with heat-treated ZnO star-shaped particles in rapeseed biodiesel

Contact Info

Product

Resources

About