Correlation between water uptake and loss of the insulating properties of PE/ATH composites used in cables applications

Perthué, Anthony; Bussière, Pierre‐Olivier; Baba, Mohamed; Larché, Jean-François; Gardette, Jean‐Luc; Thérias, Sandrine

doi:10.1016/j.polymdegradstab.2016.01.020

Cited by 12 publications

(7 citation statements)

References 24 publications

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“…As frequently reported in the literature [4,19,54], the modification of the spectrum in the carbonyl domain (1900-1500 cm -1 ) indicates that ketones (1720 cm -1 ) are formed in the initial steps, and carboxylic acids (1714 cm -1 ), esters (1735 cm -1 ) and lactones (1780 cm -1 ) form in secondary processes.…”

Section: Spectroscopy Analysis After Ageingsupporting

confidence: 74%

“…It is generally admitted that chemical degradation has consequences at upper scales and affects both macromolecular architecture [9,10] and crystalline morphology and microstructure [11][12][13][14][15], with subsequent effects on the mechanical behavior such as, for instance, embrittlement [16]. Thermal ageing of crosslinked polyethylene has also been studied, to a lesser extent [17][18][19]. Thermal oxidation leads to a decrease of the gel fraction resulting from a chain scission process [17,19] and an increase of the overall crystallinity ratio [19,20] which is usually ascribed to chemi-crystallization and/or annealing phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…Thermal ageing of crosslinked polyethylene has also been studied, to a lesser extent [17][18][19]. Thermal oxidation leads to a decrease of the gel fraction resulting from a chain scission process [17,19] and an increase of the overall crystallinity ratio [19,20] which is usually ascribed to chemi-crystallization and/or annealing phenomena. Some changes in the physical properties such as discolouration, volume shrinkage and brittleness have also been observed [21].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the physical state of a polymer blend on thermal ageing

Rapp

Tireau²,

Bussière

et al. 2019

Polymer Degradation and Stability

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Crosslinked linear polyethylene/branched polyethylene blends have been studied by thermooxidation at different temperatures (between 60°C and 110°C), which are either below or above the melting temperature of each polyethylene in the blend.The modifications of the chemical structure of both polyethylenes and the blends were monitored by infrared spectroscopy during thermo-oxidation. The same oxidation products could be identified between the linear polyethylene and the branched polyethylene. Chemical derivatization treatments allowed confirming the thermo-oxidation mechanism of polyethylene and the same oxidation products for both polyethylenes. By using an Arrhenius approach, it has been shown that accelerated ageing above 80°C is not representative of thermal ageing below this temperature. Moreover, it was shown that there was no influence of the physical state of the polymer during thermal ageing on the observed non-Arrhenius behavior. Thus, extrapolating accelerated ageing tests to lower temperatures by an Arrhenius approach in order to predict the lifetime of the polymer leads to critical errors.

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Section: Spectroscopy Analysis After Ageingsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the physical state of a polymer blend on thermal ageing

Rapp

Tireau²,

Bussière

et al. 2019

Polymer Degradation and Stability

Self Cite

View full text Add to dashboard Cite

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“…In fact, the surface resistivity change depends not only on the matrix polymer but also on the filler added to the system. These insulators contain ATH (Al 2 O 3 ·3H 2 O) in large quantity, ,− which itself is inorganic and insulating in nature, whereas the silicone elastomer on aging ultimately leads to silica formation on the surface of the insulators, which itself is a good electrical insulator. As a result, with aging, the surface resistivity change becomes almost marginal.…”

Section: Resultsmentioning

confidence: 99%

Degradation and Stability of Polymeric High-Voltage Insulators and Prediction of Their Service Life through Environmental and Accelerated Aging Processes

Ghosh

Khastgir

2018

ACS Omega

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Polymeric composite insulators consisting of core fiber reinforced polymer insulators covered with polydimethylsiloxane (PDMS) housing are now replacing conventional ceramic insulators especially for high-outdoor power transmission lines due to some specific advantages. Unlike ceramics, polymers have relatively shorter life. Outdoor insulators experience different electrical, mechanical, chemical, and thermal stresses during service. The long-term service performance of these insulators and their service life estimation is an important issue, but it is complicated and time-consuming. The objective of the present investigation is to check the rate of property deterioration during service and to find the approximate lifetime. Working insulators with different ages were collected from service, and the changes in mechanical and electrical properties and hydrophobicity of the PDMS cover against aging time were measured. The service life estimated from the change in mechanical properties and surface hydrophobicity (using MATLAB software) was compared with the service life of a new compound subjected to accelerated aging tests. Prediction of service life is helpful for replacement of aged insulators from service to avoid interruption in power transmission.

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“…Although PE is hydrophobic, it can absorb water during polymer oxidation since the accumulation of oxidation products creates a more hydrophilic matrix [Perthue et al, 2016, Nechifor, 2016. This water uptake is accelerated under elevated temperatures.…”

Section: Effect Of Watermentioning

confidence: 99%

Understanding and predicting environmental effects on degradation of oxo-degradable polyethylene blown films

Gauthier¹

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Polyethylene (PE) based films are commonly used in agriculture for different applications such as mulching, walk-in tunnel and mini greenhouse. In the case of mini greenhouse, the thin film creates a confined environment providing favourable conditions for crop growth, such as increased temperature and moisture retention, hence reducing the need for irrigation and agrochemical treatments. However, in this specific application, it is necessary to control the rate of degradation of the film above ground to enable healthy crop growth. Several studies have investigated the photo-and/or thermo-oxidation of PE in sunlight and when buried in soil or compost. However the degradation rate is not well controlled and the degradation mechanisms are not fully understood. The service lifetime of polymer films is controlled by the chemical reactions leading to chain scission and mediating environmental factors. For application in agricultural cropping films, a controlled accelerated degradation is required. The rate of PE film degradation can be influenced by its intrinsic properties (such as polymer grade, concentration and/or type of pro-degradants) but also by environmental factors, such as UV dose, temperature and humidity. However, in practice, these are not the only factors controlling the polymer lifetime, with poor translation from model (laboratory based) accelerated ageing studies to in-field application. This creates a challenge in accurately predicting the useful iii rate of photo-oxidation. Overall, additional environmental factors to solar dose and temperature were influencing the rate of PE photo-degradation. The key factors were found to be the presence of condensed water and soil type. For the latter factor, the specific soil properties of importance with respect to film degradation appeared to be associated with organic matter, although the impact of soil on PE photo-oxidation was found to be complex and likely dependent at least in part v on soil components that varied between different soil types, consequently influencing their photo-chemistry. This knowledge could assist in designing a modelling tool to recommend the appropriated time-controlled PE film suitable for a specific crop cycles at specific sites across Australia. These findings could also be transferred to other degradable PE film applications, such as mulch films, plastic bags and other packaging products. vi Declaration by author This thesis is composed of my original work, and contains no material previously published or written by another person except where due reference has been made in the text. I have clearly stated the contribution by others to jointly-authored works that I have included in my thesis. I have clearly stated the contribution of others to my thesis as a whole, including statistical assistance, survey design, data analysis, significant technical procedures, professional editorial advice, financial support and any other original research work used or reported in my thesis. The content of my thesis is the result of work I have...

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Correlation between water uptake and loss of the insulating properties of PE/ATH composites used in cables applications

Cited by 12 publications

References 24 publications

Influence of the physical state of a polymer blend on thermal ageing

Influence of the physical state of a polymer blend on thermal ageing

Degradation and Stability of Polymeric High-Voltage Insulators and Prediction of Their Service Life through Environmental and Accelerated Aging Processes

Understanding and predicting environmental effects on degradation of oxo-degradable polyethylene blown films

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