Irradiation of Ethylene/Styrene Copolymers: Evidence of Sensitization of the Aromatic Moiety As Counterpart of the Radiation Protection Effect

Ferry, M.; Bessy, Emilie; Harris, Hassan; Lutz, P.; Ramillon, J.M.; Ngono-Ravache, Y.; Balanzat, E.

doi:10.1021/jp209535p

Cited by 16 publications

(20 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This energy in aromatic molecules is then dissipated mainly by heat or light emission. 45 It was reported that, under γ-irradiation in polystyrene, the gaseous benzene yield is 8 × 10 −10 mol•J −1 . 46 The benzene yield we report here for the γ-irradiation of the Phen compound is the same within the error bars (10 −9 mol•J −1 , Table 4).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Influence of the Nature of Self-Assembled Monolayers on Their Reactivity under Ionizing Radiation: A Solid-State NMR Study

et al. 2013

View full text Add to dashboard Cite

The behavior of different nanoporous grafted silicas (−Si(CH 3 ) 2 R) under ionizing radiation is investigated as a function of the chemical nature of the grafting. The structure and reactivity of the grafting after irradiation is characterized by solid-state NMR spectroscopy. The chemical reactivity is also investigated by mass spectrometry gas analysis . The major gases detected after irradiation are H 2 and/or CH 4 . Different types of behaviors under ionizing radiation are depicted as a function of R. When R contains an aromatic ring or is the cyclopentadienyl moiety, then the overall measured radiolytic yields are low and CH 4 is the major gas detected. The aromatic ring acts as an efficient energy trap. When R contains an alkyl chain with a −CN ending, the major gas detected is dihydrogen due to the lysis of the −CH(H) bond, but it is also shown that the −CN group acts as an energy trap, even if it is of course less efficient than an aromatic ring. When R consists of a long alkyl chain, an efficient energy transfer occurs at the interface and leads to a significant H 2 production due to the lysis of the −CH(H)− bond. Lastly, when R is small (a methyl or an ethyl group), the situation is different and the Si−C bond is preferentially cleaved over the C−H bond.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Influence of the Nature of Self-Assembled Monolayers on Their Reactivity under Ionizing Radiation: A Solid-State NMR Study

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The assumption we made that vinyl groups are created in the aliphatic moiety might be questioned. As we have already shown that the radiation protection effect conferred by the benzene rings is efficient but at its expense [12], it makes sense to analyze if vinyl formation comes, at least partially, from the destruction of the styrene units by energy transfers. Results obtained when irradiating polystyrene, PS, could give some insight on the chemical modifications presumably induced in the aromatic moiety of PES.…”

Section: Vinylsmentioning

confidence: 99%

“…Nevertheless, this protection effect is more efficient at RT, proving that the radical transfers play also a role. Finally, the aromatic moiety protects the aliphatic one, but at its expense since the aromatic moiety is consumed [12].…”

Section: Introductionmentioning

confidence: 99%

Energy migration effect on the formation mechanism of different unsaturations in ethylene/styrene random copolymers

Ferry

Ramillon

Been

et al. 2019

Polymer Degradation and Stability

Self Cite

View full text Add to dashboard Cite

To evaluate the influence of specific parameters, i.e. energy sink concentration and excitons and/or radical migration, on the mechanisms underlying the formation of double bonds in aliphatic polymers, materials with energy sinks in the chain were synthesized. By following the radiation-induced modifications in ethylene/styrene random copolymers, as a function of the styrene content and of the irradiation temperature, we were able to understand the formation mechanisms of trans-vinylenes, trans-trans-dienes, allyl radicals and vinyls. The irradiation temperature allows the discrimination between energy transfers (at 11 K and at room temperature, RT) and of radical migration (at RT). Irradiations were performed using swift heavy ions, and we could show that track overlapping has also an influence on the studied chemical group concentrations. For instance, trans-vinylenes are influenced by excitation transfer and radical migration: their formation decreases in presence of styrene aromatic rings, whatever the dose range and the irradiation temperature. On the opposite, vinyls are formed only at high ionizing density and are not influenced by excitation transfer; however, their concentration is influenced by radical migration.

show abstract

“…The overall hypothesis behind this work is that the lacquer studied herein will exhibit superior radiation resistance. This is substantiated by the fact that Toxicodendron succedanea contains hydroxyl phenyl groups that act as radical scavengers, enhancing radiation resistance via their ability to convert excitation energy into nonchemistry inducing energy in lacquer that has been cured . Further, Rogner and Langhals have shown via IR and mass spectroscopy that doses of 300 kGy (30 Mrad) electron beam (EB) do not result in measurable damage in qi‐lacquer (urushi) .…”

Section: Introductionmentioning

confidence: 99%

Synthesizing radiation‐hard polymer and copolymers usinglaccolmonomers extracted from lacquer treetoxicodendron succedaneavia cationic polymerization

Arachchilage

Patel

Harmon

2019

Polymer Engineering & Sci

View full text Add to dashboard Cite

In recent years, lacquer chemistry stimulated more attention from the scientific community due to its environmental friendly applications. Additionally, the “laccol” possesses promising radiation resistance due to its highly crosslinked polymer network. In nature, lacquer polymerization is induced via enzymatic radical initiation. Herein, as a novel approach, lacquer polymer was synthesized via cationic polymerization with aluminum chloride‐ethyl acetate coinitiator. This approach was further improved by polymerizing copolymers of laccol and styrene designed for use in radiation‐hard materials. The infrared spectroscopic data clearly provide evidence for reactions with trans conjugated double bonds present in long side chain (988 and 966 cm−1 are bending vibrations of conjugated alkenes) of laccol monomer accompanying polymerization. This was further verified with proton nuclear magnetic resonance analysis. An increase in hardness was observed for all the compositions: remarkably for neat laccol polymer, and 90% and 70% laccol‐styrene copolymers after the gamma irradiation using Co‐60 gamma irradiator. Properties such as thermal stability and hardness were improved after irradiation due to the increase in physical and small amounts of chemical crosslinking. Therefore, the developed materials are suitable candidates to produce radiation‐hard polymer and copolymer coatings for aerospace operations, nuclear reactors, and medicinal and automobile sectors. POLYM. ENG. SCI., 59:1611–1623 2019. © 2019 Society of Plastics Engineers

show abstract

Irradiation of Ethylene/Styrene Copolymers: Evidence of Sensitization of the Aromatic Moiety As Counterpart of the Radiation Protection Effect

Cited by 16 publications

References 22 publications

Influence of the Nature of Self-Assembled Monolayers on Their Reactivity under Ionizing Radiation: A Solid-State NMR Study

Influence of the Nature of Self-Assembled Monolayers on Their Reactivity under Ionizing Radiation: A Solid-State NMR Study

Energy migration effect on the formation mechanism of different unsaturations in ethylene/styrene random copolymers

Synthesizing radiation‐hard polymer and copolymers usinglaccolmonomers extracted from lacquer treetoxicodendron succedaneavia cationic polymerization

Contact Info

Product

Resources

About