Chemiluminescence of hydrocarbon polymers

Jiráčková, L.; Verdú, J.

doi:10.1002/pola.1987.080250502

Cited by 63 publications

(5 citation statements)

References 19 publications

(1 reference statement)

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“…The 400 nm peak may be considered either to be due to the de-excitation of a final product created during the treatment, presumably carbonyls [38,39], or to be the photoluminescence of a group created during the discharge and subsequently excited by the discharge light.…”

Section: Discussionmentioning

confidence: 99%

On the UV contribution to plasma-induced luminescence of polypropylene

Teyssèdre

Tiemblo

Massines

et al. 1996

J. Phys. D: Appl. Phys.

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Cold plasma treatments of polymers induce surface transformations through several mechanisms involving photons, charges, radicals and excited species produced in the discharge. We have isolated the UV interaction contribution to the total luminescence emitted by the polymer after plasma discharge. Spectral and time-resolved light analyses have shown that the emitted light is constituted of the same components as in plasma-induced luminescence, namely photoluminescence, chemiluminescence and charge-recombination contributions. The essential differences were found in the dependence of the emission upon the treatment time. The luminescence intensity following plasma interaction decreased for increasing treatment time, whereas the UV interaction led to increasing emission followed by a steady-state luminescence level. In addition, the spectral distribution after a long exposure to UV did not evolve in an irreversible fashion. Some features of the time-dependence of the total intensity have been explained on the bases of luminescence decay analyses following conventional photoluminescence excitation. Whereas plasma interaction induced strong surface transformations, UV probably acts through more selective processes such as initiation of decomposition of hydroperoxides.

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Section: Discussionmentioning

confidence: 99%

On the UV contribution to plasma-induced luminescence of polypropylene

Teyssèdre

Tiemblo

Massines

et al. 1996

J. Phys. D: Appl. Phys.

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“…In a unimolecular reaction, ROOH initiators were decomposed to produce RO⋅ radicals. In a bimolecular reaction, RO⋅ and ROO⋅ radicals could be generated [34] . For the pristine PE, sufficient ROO⋅ radicals reacted to generate carbonyl compounds (Scheme S1A).…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the peaks of ketone (1710 cm À 1 ) and aldehydes (1730 cm À 1 ) were also recognized for the degraded PE@2 %MgAl-LDH, indicating the β-secession of RO * for the first luminescence peak in an early-stage of degradation. [34] Therefore, it can be concluded that the degradation pathways of PE were lighted by the emissive carbonyl compounds, and the pathways were modulated by Mg 3 Al-LDHs to generate aldehyde groups as the emitting species.…”

Section: Angewandte Chemiementioning

confidence: 98%

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Regulating Degradation Pathways of Polymers by Radical‐Triggered Luminescence

Hou,

Feng,

Tian

et al. 2023

Angew Chem Int Ed

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Understanding the radical behaviours during polymer degradation is beneficial to unveil and regulate the degradation pathways of polymers to achieve a sustainable polymer development. However, it is a long‐standing challenge to study radical behaviours owing to the ultra‐short lifetime of the transient radicals generated during the polymer degradation. In this contribution, we have proposed the radical‐triggered luminescence to monitor the radical behaviours during polymer degradation without/with the addition of inorganic additives. It was disclosed that the pure polymers showed a single sigmoidal dynamic curve from peroxy radicals (ROO⋅) emissions, leading to the exponential proliferation for the degradation evolution. Alternatively, the degradation pathways with the addition of additives, layered double hydroxides (LDHs) with positively charged Al centers, could be modulated into a double sigmoidal dynamics, involving the main product of alkoxy radicals (RO⋅) with the activation energy of 40.2 kJ/mol and a small amount of ROO⋅ with 76.3 kJ/mol, respectively. Accordingly, the polymers with the additive‐regulated pathways could exhibit prominently anti‐degradation behaviours. This work is beneficial for the deep understanding of the radical mechanisms during polymer degradation, and for the rational design of anti‐degradation polymers.

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“…The loss of methylenebisphenol can be derived from eq. (1) by the equation (3) After introduction of and by substituting both relationships into eq. (2), we obtain By taking the logarithm of eq.…”

Section: Resultsmentioning

confidence: 99%

Antioxidants and stabilizers. XLI. reaction of tert‐butyl hydroperoxide with 2,2′‐methylenebis(4‐methyl‐6‐tert‐butylphenol)

Zikmund

Brodilová

Janota

et al. 1973

J. polym. sci., C Polym. symp.

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The reaction of tert‐butyl hydroperoxide with 2,2′‐methylenebis(4‐methyl‐6‐tert‐butylphenol) in a benzene solution was studied within the temperature range 132 to 170°C. The change in the concentration of both components and the formation of the products were investigated depending on time. The products thus formed were isobutylene, tert‐butyl alcohol, acetone, and the oxidation products of methylenebisphenol. Individual amounts produced depended on the reaction temperature and the initial concentration of the starting compounds. GPC was used for the following transformations of methyl‐enebisphenol. The decomposition of tert‐butyl hydroperoxide was found to be accelerated by the presence of methylenebisphenol, which, however, affects but little the splitting of the tert‐butoxyl radicals yielding acetone.

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Chemiluminescence of hydrocarbon polymers

Cited by 63 publications

References 19 publications

On the UV contribution to plasma-induced luminescence of polypropylene

On the UV contribution to plasma-induced luminescence of polypropylene

Regulating Degradation Pathways of Polymers by Radical‐Triggered Luminescence

Antioxidants and stabilizers. XLI. reaction of tert‐butyl hydroperoxide with 2,2′‐methylenebis(4‐methyl‐6‐tert‐butylphenol)

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