Degradation of epoxy resins under high energy electron beam irradiation: Radio-oxidation

Longiéras, Nicolas; Sebban, Muriel; Palmas, P.; Rivaton, Agnès; Gardette, Jean‐Luc

doi:10.1016/j.polymdegradstab.2007.01.035

Cited by 58 publications

(45 citation statements)

References 15 publications

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“…The oxidative degradation of epoxy coatings will probably involve the abstraction of the hydrogen atom on the secondary carbon atom situated in the a position to the oxygen in the ether bond or the nitrogen atom in the tertiary amine bond. [54][55][56][57][58] The ether and amine groups are particularly vulnerable because the electron negativity of the oxygen or nitrogen atom attracts the electron density from the bond with the neighboring carbon atom. However, the free radicals formed by the corrosion process will degrade the coating concurrently with the alkaline hydrolysis of the bonds between the coating and the steel surface.…”

Section: Degradation Resulting From Free Radicalsmentioning

confidence: 99%

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Sörensen

Weinell²,

Dam‐Johansen

et al. 2010

J Coat Technol Res

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Cathodic delamination is one of the major modes of failure for anticorrosive coatings subjected to a physical damage and immersed in seawater. The cause of cathodic delamination has been reported to be the result of a chemical attack at the coating-steel interface by free radicals and peroxides formed as intermediates in the cathodic reaction during the corrosion process. In this study, antioxidants (i.e., free radical scavengers and peroxide decomposers) have been incorporated into various generic types of coatings to investigate the effect of antioxidants on the rate of cathodic delamination of epoxy coatings on cold rolled steel. The addition of <5 wt% free radical scavengers to epoxy coatings improved the resistance toward cathodic delamination by up to 50% during seawater immersion, while peroxide decomposers had a limited effect. Testing using substrates prepared from stainless steel, copper, aluminum, galvanized steel, and brass also showed a reduction in the rate of cathodic delamination when the coating was modified with a free radical scavenger. The protective mechanism of free radical scavengers investigated for the primers are similar to that of antioxidants used for protection against photochemical degradation by UV-radiation of top coatings. Both substrate corrosion and degradation of a coating exposed to UV-radiation lead to the formation of free radicals as reactive intermediates.

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Section: Degradation Resulting From Free Radicalsmentioning

confidence: 99%

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Sörensen

Weinell²,

Dam‐Johansen

et al. 2010

J Coat Technol Res

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show abstract

“…The product amide could hydrolyze to form formic acid and a secondary amine. Longieras et al (2007) conducted experiments irradiating polymers in air that were similar to the experiments done irradiating polymers in nitrogen. They concluded that irradiation resulted in hydrogen abstraction at either the alcohol carbon or an adjacent carbon (Fig.…”

Section: Effect Of Irradiationmentioning

confidence: 99%

Iodine–paint interactions during nuclear reactor severe accidents

Bosland

Dickinson

Glowa

et al. 2014

Annals of Nuclear Energy

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“…Literature survey reveals that there are extensive studies on these aspects including epoxy resins [13]. Some polymers like Poly methyl methacrylate (PMMA), Poly carbonate (PC) undergo chain scission on exposure to radiations, while crosslinking is also observed in some polymers like Polyethylene (PE), Polystyrene (PS) etc [11].…”

Section: Introductionmentioning

confidence: 99%

Electron Beam Induced Microstructural Changes and Electrical Conductivity in Bakelite RPC Detector Material

Kumar

Ravikumar

Sanjeev

et al. 2015

IEEE Trans. Nucl. Sci.

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To explore the structural modifications in terms of crosslink density and electrical conductivity in polymer based Bakelite RPC detector material was exposed to 8 MeV electron beam with the irradiation doses of 20 kGy to 100 kGy in steps of 20 kGy. The microstructural changes of Bakelite upon electron beam irradiation have been studied using Positron Annihilation Lifetime Spectroscopy (PALS), X-ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) Spectroscopy. Positron lifetime parameters viz., o-Ps lifetime and its intensity showed chain scission at lower doses (at 20 kGy and 40 kGy) followed by crosslinking due to the radical reactions. These changes are effectively explained with the help of FTIR and XRD parameters. The reduction in electrical conductivity of Bakelite material beyond 60 kGy is correlated between conducting pathways and crosslinks in the polymer matrix. The appropriate dose of electron beam on Bakelite might reduce the leakage current of Bakelite RPC detector material and hence improves the performance of the detector.

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Degradation of epoxy resins under high energy electron beam irradiation: Radio-oxidation

Cited by 58 publications

References 15 publications

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Iodine–paint interactions during nuclear reactor severe accidents

Electron Beam Induced Microstructural Changes and Electrical Conductivity in Bakelite RPC Detector Material

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