Ageing of EPDM—2. Role of hydroperoxides in photo- and thermo-oxidation

Delor, F.; Teissedre, G.; Baba, Mohamed; Lacoste, J.

doi:10.1016/s0141-3910(97)00087-6

Cited by 43 publications

(20 citation statements)

References 19 publications

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“…27 Pilichowski et al 31 recognized that these gaseous treatments are of undeniable interest from an analytical point of view, but also argued that they are only effective for thin polymer films of about 100 mm thickness. According to Ollier-Dureault et al, 38 Delor et al, 39 and Maillot et al, 40 SF 4 and NH 3 treatments would lead to similar results, regardless of the operating conditions of experimental protocol or the way to exploit data.…”

Section: Introductionmentioning

confidence: 94%

Thermo‐oxidative degradation of additive free polyethylene. Part I. Analysis of chemical modifications at molecular and macromolecular scales

Cruz

Schoors²,

Benzarti³

et al. 2016

J of Applied Polymer Sci

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The effects of thermal oxidation on the molecular and macromolecular structures of additive free PE were investigated between 100 °C and 140 °C in air in order to tentatively establish non‐empirical structure/property relationships. In the first part, the changes in POOH concentration were assessed by three different analytical methods: iodometry, modulated differential scanning calorimetry, and Fourier transform infrared (FTIR) spectrophotometry after SO2 treatment. All these methods provided very similar results until the end of the induction period, after which iodometry overestimated strongly POOH concentration because it titrates also other chemical species formed at high conversion ratios, namely double bonds. In parallel, the changes in carbonyl group concentration were determined by FTIR spectrophotometry after NH3 treatment. As the accumulation kinetics of ketones, aldehydes, and carboxylic acids were closely interrelated, the question of their actual formation mechanisms in the current thermal oxidation mechanistic scheme was raised. An alternative reaction pathway was proposed for the bimolecular decomposition of POOH. In the second part, the corresponding changes in weight and number average molecular masses were monitored by high temperature gel permeation chromatography equipped with a triple detection technology. As both quantities decreased dramatically from the beginning of exposure and their ratio Mw/Mn tends toward the asymptotic value of 2 and it was concluded that a “pure” chain scission process operated. Finally, as the number of chain scissions perfectly correlates, the concentration sum of aldehydes and their oxidation products (i.e., carboxylic acids), it was also concluded that these carbonyl groups result exclusively from the β scission of alkoxy radicals. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43287.

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Section: Introductionmentioning

confidence: 94%

Thermo‐oxidative degradation of additive free polyethylene. Part I. Analysis of chemical modifications at molecular and macromolecular scales

Cruz

Schoors²,

Benzarti³

et al. 2016

J of Applied Polymer Sci

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show abstract

“…The chain scission occurs through CeC bond cleavage by the energy of the laser photons, or movement of oxygen which reacts with a radical to form peroxides. There are several suggested mechanisms of peroxide formation of macromolecules [18]. The crosslinking is induced between the neighbouring chains by the free radicals produced due to the cleavage of CeH bond.…”

Section: Resultsmentioning

confidence: 99%

Crosslinking of ethylene–propylene (–diene) terpolymer elastomer initiated by an excimer laser

Khan¹,

Kwek²,

Kronfli³

et al. 2007

Polymer Degradation and Stability

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“…Delor et.al. [11], Wang and Qu [12] have studied the thermal degradation of EPDM, which results in the formation of hydroxyl and carbonyl groups (wavenumber around 3500 cm -1 and 1700 cm -1 , respectively). From Figure. 4(a), the peak intensity appearing at 1376 cm -1 is attributed to the -CH 3 stretching vibration also remains constant.…”

Section: Plausible Reaction Mechanism For Devulcanizationmentioning

confidence: 99%

Investigation the degradation and devulcanization reaction of thermoplastic vulcanizate using peroxide compound

Temram¹,

Wattanakul²

2012

AIP Conference Proceedings

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Ageing of EPDM—2. Role of hydroperoxides in photo- and thermo-oxidation

Cited by 43 publications

References 19 publications

Thermo‐oxidative degradation of additive free polyethylene. Part I. Analysis of chemical modifications at molecular and macromolecular scales

Thermo‐oxidative degradation of additive free polyethylene. Part I. Analysis of chemical modifications at molecular and macromolecular scales

Crosslinking of ethylene–propylene (–diene) terpolymer elastomer initiated by an excimer laser

Investigation the degradation and devulcanization reaction of thermoplastic vulcanizate using peroxide compound

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