2019
DOI: 10.1088/1361-6463/ab2f38
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Abstract: A blend composed of a high-density polyethylene and a low-density polyethylene was subjected to thermo-oxidative ageing at 160 °C, under conditions where oxygen diffusion effects lead to a non-uniform distribution of chemical defects throughout the specimens. The existence of highly and lightly oxidised regions was demonstrated by Fourier transform infrared spectroscopy and confocal Raman microprobe spectroscopy and the effect of these on the dielectric behaviour of the system was investigated. Dielectric spec… Show more

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Cited by 19 publications
(20 citation statements)
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References 75 publications
(110 reference statements)
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“…Meanwhile, the absorption bands within the range of 1500-1900 cm −1 are related to carbonyl groups associated with ketone, aldehyde and γ-lactone, which are, respectively, located at 1716, 1725 and 1780 cm −1 . These ageing-induced chemical modifications are consistent with complementary results obtained from the same system after ageing at 160°C; previously, we reported a marked increase in the intensity of the above bands for ageing times in excess of 3 h at 160°C [20]. For ageing at 120°C, comparable effects occur beyond 144 h. This suggests that increasing the temperature by 10°C results in a reduction in the induction time of ∼60%; previously, Anandakumaran and Stonkus [28] considered the behaviour of cross-linked PE (XLPE) aged at temperatures from 120 to 140°C and reported that an increase in ageing temperature of 10°C reduced the induction time by ∼50%.…”
Section: Chemical Structural and Electrical Characterisationsupporting
confidence: 92%
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“…Meanwhile, the absorption bands within the range of 1500-1900 cm −1 are related to carbonyl groups associated with ketone, aldehyde and γ-lactone, which are, respectively, located at 1716, 1725 and 1780 cm −1 . These ageing-induced chemical modifications are consistent with complementary results obtained from the same system after ageing at 160°C; previously, we reported a marked increase in the intensity of the above bands for ageing times in excess of 3 h at 160°C [20]. For ageing at 120°C, comparable effects occur beyond 144 h. This suggests that increasing the temperature by 10°C results in a reduction in the induction time of ∼60%; previously, Anandakumaran and Stonkus [28] considered the behaviour of cross-linked PE (XLPE) aged at temperatures from 120 to 140°C and reported that an increase in ageing temperature of 10°C reduced the induction time by ∼50%.…”
Section: Chemical Structural and Electrical Characterisationsupporting
confidence: 92%
“…These thermal treatments were chosen in order to generate radically different lamellar morphologies [22]. Specimens prepared as above were thermally aged at 120°C in air by suspending them in a fan oven (Heraeus, Kendro Laboratory Products UT6) for periods ranging from 120 to 720 h. These conditions were determined from initial scoping experiments and were chosen such that degradation should not be limited by oxygen diffusion [23], in contrast to work reported by us elsewhere [20]. Samples prepared as above are subsequently referred to using the following general notation T/t a , where T is indicative of the initially imposed thermal history (quenched, Q; isothermal crystallisation at 115°C, 115I; isothermal crystallisation at 124°C, 124I) and t a indicates the subsequent ageing time in hours at 120°C.…”
Section: Sample Preparation and Ageing Proceduresmentioning
confidence: 99%
“…For example, in the case of the specimens aged for 3 -4 h, the duration of a breakdown experiment is ~100 s; from the data presented in Figure 6, little space charge then accumulates within the specimen in these less heavily aged specimens. Conversely, in the sample aged for 6 h, space charge accumulates rapidly [14] and would therefore be expected to promote breakdown, which is contrary to what is seen. The implication of this is therefore that the measured breakdown strength is not dominated by the accumulated space charge but, rather, results from a combination of space charge effects and variations in material properties.…”
Section: Aging Charge Transport and Breakdownmentioning
confidence: 59%
“…Elsewhere [14], we have presented a general overview of aging and space charge accumulation in a quenched HDPE/LDPE and, therefore, we will focus here on specimens aged from 3 h to 4 h, where dramatic changes occur. For the traces presented in Figure 6, the charge on the electrodes has been subtracted from the raw data in order better to reveal the space charge within the polyethylene and the consequent induced charges on the electrodes.…”
Section: Aging and Charge Trappingmentioning
confidence: 99%
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