Determination of the aging mechanism of single core cables with PVC insulation

Quennehen, Pierre; Royaud, Isabelle; Seytre, Gérard; Gain, Olivier; Rain, Pascal; Espilit, Thierry; François, Sébastien

doi:10.1016/j.polymdegradstab.2015.05.008

Cited by 24 publications

(14 citation statements)

References 15 publications

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“…A shoulder to the lower frequency side of the 1700 cm -1 peak (at ~1650 cm -1 ) is more clearly visible in the aged films, and is attributed to the presence of C=C bonds, which are not present in molecules of the monomers or comonomers (propanol and chloroform). These likely result from dehydrochlorination, which is known to occur in the aging of conventional poly(vinyl) chloride 8 . Table 1 shows the elemental compositions (C, O, Si and Cl) of the original and aged films as determined by XPS and EDS, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effects of Aging on Chlorinated Plasma Polymers

et al. 2017

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Thin films deposited from propanol-chloroform-argon mixtures by plasma enhanced chemical vapor deposition at different partial pressures of chloroform in the feed, C Cl , were characterized after two years of aging and their characteristics compared with their as-deposited properties. Film thickness decreased and surface roughness increased with aging. Surface contact angles also increased with aging for the chlorinated films. For the film deposited with 40% chloroform in the feed the contact angle increased about 14°. Transmission infrared and Energy dispersive X-ray spectroscopy revealed that the films gain carbonyl and hydroxyl groups and lose chlorine and hydrogen on aging. Chlorination appears to make the films more durable. Delamination was observed for the unchlorinated films.

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Section: Resultsmentioning

confidence: 99%

Effects of Aging on Chlorinated Plasma Polymers

et al. 2017

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“…It can be found that the contents of carbon and chlorine are decreased while the content of oxygen is increased with thermal aging degree. That could be ascribed to the dehydrochlorination and oxidation of the material during the thermal aging [ 24 , 29 ]. Varied sample preparation methods were applied to the tests.…”

Section: Methodsmentioning

confidence: 99%

“…Certainly, there are some studied on the aged PVC cable [ 2 , 3 , 4 , 5 , 24 , 25 , 26 , 27 ]. Quennehen et al [ 24 ] analyzed the two sets of single core cables with PVC insulation to determine the aging mechanism that is responsible for this decrease of electrical properties. Jakubowicz et al [ 5 ] studied the effects of accelerated and natural ageing on plasticized PVC cable and concluded that the accelerated ageing did not significantly affect the tensile properties of the insulation materials.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis and Combustion of Polyvinyl Chloride (PVC) Sheath for New and Aged Cables via Thermogravimetric Analysis-Fourier Transform Infrared (TG-FTIR) and Calorimeter

et al. 2018

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To fill the shortages in the knowledge of the pyrolysis and combustion properties of new and aged polyvinyl chloride (PVC) sheaths, several experiments were performed by thermogravimetric analysis (TG), Fourier transform infrared (FTIR), microscale combustion calorimetry (MCC), and cone calorimetry. The results show that the onset temperature of pyrolysis for an aged sheath shifts to higher temperatures. The value of the main derivative thermogravimetric analysis (DTG) peak of an aged sheath is greater than that of a new one. The mass of the final remaining residue for an aged sheath is also greater than that of a new one. The gas that is released by an aged sheath is later but faster than that of a new one. The results also show that, when compared with a new sheath, the heat release rate (HRR) is lower for an aged one. The total heat release (THR) of aged sheath is reduced by 16.9–18.5% compared to a new one. In addition, the cone calorimetry experiments illustrate that the ignition occurrence of an aged sheath is later than that of a new one under different incident heat fluxes. This work indicates that an aged sheath generally pyrolyzes and it combusts more weakly and incompletely.

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“…It is generally accepted that the fine structure in the absorption spectra is due to the formation of conjugated polyenes of the type H(CHCH) n H or CH 3  (CHCH) n CH 3 . Thus formed polyene sequences absorb light at a particular wavelength, λ, with a particular molar absorption coefficient,

ɛ_{λ} .

Each wavelength considered between 268 and 447 nm correspond to a particular number of conjugated polyenes from 3 to 10 in increasing order. For instance, the light absorbance at 268 and 390 nm correspond to the polyene sequences having three and seven CDB with

ɛ_{λ}

values of 34.6 × 10 3 and 174 × 10 3 L/mol cm, respectively.…”

Section: Theoreticalmentioning

confidence: 99%

Assessment of degradation of plasticized poly(vinyl chloride) films through polyene formation under isothermal conditions

Demir

Ulutan

2017

J of Applied Polymer Sci

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The aim of this work is to assess the degradation of flexible poly(vinyl chloride) (PVC) films produced using orthophthalate based and recently introduced nonorthophthlate plasticizers which have compliance with recent environmental regulations. The plasticized PVC films were subjected to several heat treatments at 85–160 °C up to 420 min. Ultraviolet–visible spectroscopy was utilized to follow polyene formation upon dehydrochlorination of PVC. The amount of polyenes formed exhibited difference amongst the films those plasticized with diethyl hexylphthalate, diisodecyl phthalate, dioctyl terephthalate (DOTP), and diisononyl 1,2‐cyclohexanedicarboxylic acid (DINCH). The order of polyene concentration formed at the utmost level severe heat treatment is in line with the molecular weight ranking from highest to lowest, as the films with diisodecyl phthalate > DINCH > DOTP > diethyl hexylphthalate. Discoloration assessed in terms of yellowness index revealed that the films having recently introduced plasticizers as DOTP and DINCH were competing well with the films having orthophthalate based plasticizers. Scanning electron microscopy images revealed that the longer times for gelation during their production would improve the maturation of the films although they are already coherent and strong. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46092.

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Determination of the aging mechanism of single core cables with PVC insulation

Cited by 24 publications

References 15 publications

Effects of Aging on Chlorinated Plasma Polymers

Effects of Aging on Chlorinated Plasma Polymers

Pyrolysis and Combustion of Polyvinyl Chloride (PVC) Sheath for New and Aged Cables via Thermogravimetric Analysis-Fourier Transform Infrared (TG-FTIR) and Calorimeter

Assessment of degradation of plasticized poly(vinyl chloride) films through polyene formation under isothermal conditions

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