Oxidation of solid polyethylene films: Effects of backbone branching

Carlsson, D. J.; Bazan, Guillermo C.; Chmela, Štefan; Wiles, D. M.; Russell, K. E.

doi:10.1016/0141-3910(87)90054-1

Cited by 31 publications

(11 citation statements)

References 24 publications

(5 reference statements)

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“…The lower the dose rate, the higher the formation of oxidation products. An important observation is that kinetic accumulation of γ -initiated oxidation products is linear during irradiation with a high dose rate (PP-780), in accordance with the results of previous studies [9][10][11]. However, the accumulation of some oxidation products during irradiation with a low dose rate (PP-600) was linear in the initial stage of γ -oxidation but then reached a stationary state.…”

Section: Kinetic Accumulation Of γ -Initiated Oxidation Products In Ppsupporting

confidence: 89%

“…Contradictory information on the accumulation of oxidation products resulting from γ -irradiation of even the simplest polymer, PE, has appeared in the literature [6][7][8]. A linear relationship has been found between the increase in the rate of oxidation and the dose absorbed [9][10][11]. Parameters such as the morphology of the polymer and the irradiation conditions (under vacuum or air, at different temperatures) can significantly affect the γ -irradiation process.…”

Section: Introductionmentioning

confidence: 96%

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γ-Initiated Oxidation of Isotactic Polypropylene: Effect of γ-Dose Rate on Durability

2011

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The effect of γ -irradiation dose rate on the chemical, molecular, and mechanical properties of isotactic polypropylene (iPP) films was investigated using three different 60 Co sources with dose rates of 600, 660, and 780 Gy h −1 . Fourier transform infrared spectroscopy coupled with chemical derivatization with NO and SF 4 , and measurements of the elongation at break, toughness, and molecular weight were used to describe the effects of γ -dose rate on iPP. It was found that the formation of oxidation products depended significantly on the dose rate. However, the kinetic accumulation of ketones were more sensitive to the dose rate of gamma source. Degradation induced by γ -radiation depends on the dose rate-the degradation of mechanical properties was more significant at a low dose rate than at a high dose rate. It was found that the lower the dose rate, the higher the degree of oxidation in terms of the formation of γ -products. The mechanism of γ -degradation is discussed based on the correlation between the changes in chemical and physical properties upon exposure to γ -radiation.

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Section: Kinetic Accumulation Of γ -Initiated Oxidation Products In Ppsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 96%

γ-Initiated Oxidation of Isotactic Polypropylene: Effect of γ-Dose Rate on Durability

2011

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“…Vinyl index were measured by FTIR from the 910 cm −1 absorbance. The presence of short chain branching was estimated from the ratio of absorbances at 1370 to 1450 cm −1 (NB: It was chosen to consider the whole area of the absorbance in a first approach since there are actually several maxima for the absorbance centered at 1370 cm −1 [10]). …”

Section: Methodsmentioning

confidence: 99%

Polyethylene loss of ductility during oxidation: Effect of initial molar mass distribution

Reano

Guinault

Richaud

et al. 2018

Polymer Degradation and Stability

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“…It has previously been shown that this film has 0.53 mol kg-1 of tert-C--H sites and that the branch groups are predominantly --C2H5. 6 Some of this extracted LLDPE film was pre-oxidized to 5, 10 or 15 Mrad total dose by exposure in an AECL Gammacell 220 (0.7 Mrad h-1 dose rate) in air. Pre-oxidized and nonoxidized films were exposed, after being sealed under vacuum in 1 cm ID borosilicate tubes, to either ),-radiation from the Gammacell, or to the radiation from a xenon arc WeatherOmeter (Atlas, 2500W, borosilicate inner and outer filters, silver panel temperature 55°C) or in a forced air oven at 85°C.…”

Section: Methodsmentioning

confidence: 99%