Effect of oxygen on the degradation of polypropylene initiated by ionizing irradiation

Gorelik, B.A.; Kolganova, I. V.; Matisová‐Rychlá, L.; Listvojb, G.I.; Drabkina, A. M.; Golnik, A.G.

doi:10.1016/0141-3910(93)90222-5

Cited by 20 publications

(10 citation statements)

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“…On the other hand, it was found that the wavenumber of PP‐DVC compound gradually reduced when the irradiation dose increase from 0 kGy to 200 kGy. This is due to the formation of carbonyl (CO) group has weakened the CH 2 bonding as the oxidation occurs when applied with the EB irradiation . This result shows agreement in Fig.…”

Section: Resultssupporting

confidence: 84%

Electron Beam Irradiation to Recrosslink Devulcanized Sulfur Cured Rubber Blended Polypropylene

Loo

Sin

Bee

et al. 2019

Polymer Engineering & Sci

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This study aims to investigate the effect electron beam (EB) irradiation on the polypropylene/devulcanized sulfur cured rubber (PP‐DVC) compound. The PP‐DVC compounds were compounded using twin‐screw extruder and then compression molded into required shapes before irradiation begins. The gel content of all irradiated PP‐DVC compounds gradually increased with higher irradiation dose indicated that the presence of DVC plays an important role in crosslinking enhancement. The mechanical properties of PP‐DVC compounds were observed marginally higher at low irradiation dosages (≤50 kGy). However, higher irradiation dosages up to 200 kGy cause adverse effect to the PP‐DVC compounds. In addition, the application of low irradiation dosage could enhance the dispersion of DVC particles at 20 phr composition in PP matrix. This also found that the scanning electron microscopy (SEM) observation where the DVC particles dispersed better in PP matrix compared to that of nonirradiated samples. Further increment in irradiation dosages up to 200 kGy reduced the crystallinity caused by chain scissoring process could rupture the crystalline structure in PP matrix. It was also found that the wavenumber of the CH and CH2 groups for irradiated samples reduced at high irradiation dosages due to the formation of carbonyl group. POLYM. ENG. SCI., 59:1017–1027, 2019. © 2019 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 84%

Electron Beam Irradiation to Recrosslink Devulcanized Sulfur Cured Rubber Blended Polypropylene

Loo

Sin

Bee

et al. 2019

Polymer Engineering & Sci

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“…The solutions in this study were irradiated in absence of HNO 3 (or any other aqueous phase). The degradation of solid polypropylene was accelerated when oxygen was present during γ -irradiation compared to irradiation in the absence of oxygen [29]. A possible reaction between irradiated organic solutions and oxygen might be that between hydrocarbon radicals, formed by chain cleavage caused by γ -irradiation, and O 2 present in surrounding air.…”

Section: Resultsmentioning

confidence: 93%

Influence of dose rate on the radiolytic stability of a BTBP solvent for actinide(III)/lanthanide(III) separation

Fermvik¹,

Ekberg

Englund³

et al. 2009

Radiochimica Acta

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Irradiation / Dose rate / Solvent extraction / Partitioning / Actinides / Lanthanides / Distribution ratio / Separation factorSummary. The recently developed ligand MF2-BTBP dissolved in cyclohexanone is a promising solvent for the group separation of trivalent actinides(III) from the lanthanides(III). Its high stability against nitric acid has been demonstrated recently. Since the solvent is also exposed to a continuously high radiation level in the counter current process, the radiolytic stability of the solvent was examined in this study. Irradiation experiments were carried out up to an absorbed dose of 100 kGy and the effect of the dose rate was investigated. The extraction behaviour for An(III)/Ln(III) separation was studied after radiolysis for evaluation. It was found that during high dose rate irradiation the extraction efficiency for both Am(III) and Eu(III) decreased significantly with increasing absorbed dose, whereas during the low dose rate irradiation the extraction efficiencies remained more or less at the same level.

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“…However, when molecular weight 30,86,97,101,103,105,106,110,119,127,134,164,165,175,181,186,192,202,205,213,255,272,273,287,399,410, is used as an indicator of degradation, the interpretation of results is complicated by the fact that crosslinking and chain scission occur simultaneously. However, when molecular weight 30,86,97,101,103,105,106,110,119,127,134,164,165,175,181,186,192,202,205,213,255,272,273,…”

Section: Molecular Weightmentioning

confidence: 99%

Testing Methods of Weathered Specimen

Wypych¹

2013

Handbook of Material Weathering

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Effect of oxygen on the degradation of polypropylene initiated by ionizing irradiation

Cited by 20 publications

References 0 publications

Electron Beam Irradiation to Recrosslink Devulcanized Sulfur Cured Rubber Blended Polypropylene

Electron Beam Irradiation to Recrosslink Devulcanized Sulfur Cured Rubber Blended Polypropylene

Influence of dose rate on the radiolytic stability of a BTBP solvent for actinide(III)/lanthanide(III) separation

Testing Methods of Weathered Specimen

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