Radiation‐induced oxidation of polymers. Effect of antioxidant and antirad agent on oxygen consumption and gas evolution

Arakawa, Kazuo; Seguchi, Tadao; Hayakawa, Naohiro; Machi, Sueo

doi:10.1002/pol.1983.170210424

Cited by 31 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the transformation stage, the resulting oxygen reaction term and the moment balances are those shown in Equations (A.14)e(A.18). 14) ath moment for polymer (a ¼ 0,1,2)…”

Section: Discussionmentioning

confidence: 99%

“…Irradiation-induced oxidation has been reported to depend on the crystallinity of the polymer [4,5,11e13], oxygen diffusion [1,2,4], the presence of antioxidant or antirad agents [3,14], and total dose. Several authors have concluded that irradiation rate is also an important variable, although at least in some cases this could be assimilated to the effect of oxygen diffusion, since lower irradiation rates allow time for oxygen to diffuse into the samples [15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of oxygen on the irradiation process of ethylene–butene copolymer

Failla¹,

Brandolin²,

Sarmoria³

et al. 2012

Polymer Degradation and Stability

View full text Add to dashboard Cite

“…After the transformation stage, the resulting oxygen reaction term and the moment balances are those shown in Equations (A.14)e(A.18). 14) ath moment for polymer (a ¼ 0,1,2)…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of oxygen on the irradiation process of ethylene–butene copolymer

Failla¹,

Brandolin²,

Sarmoria³

et al. 2012

Polymer Degradation and Stability

View full text Add to dashboard Cite

“…As in the case of UV-degradation, an efficient stabilisation against g-irradiation should take into account a rate of decrease in radical formation and should minimise the anti-oxidant degradation by the use of high concentration of aromatic molecules acting similarly with energy transfer and dissipation. Compounds like anthracene, biphenyl or aromatic polyimides, which were found to be effective ''anti-rads'' [22,23], should be used in combination with classical antioxidants.…”

Section: Discussionmentioning

confidence: 99%

Radiochemical ageing of ethylene–propylene–diene elastomers. 4. Evaluation of some anti-oxidants

Rivaton

Cambon

Gardette

2006

Polymer Degradation and Stability

View full text Add to dashboard Cite

The preceding papers of this series were devoted to the identification and quantification of the main chemical changes resulting from the radiochemical ageing of EPDM (77.9% ethylene, 21.4% propylene, 0.7% diene) and EPR (76.6% ethylene, 23.4% propylene) films irradiated under oxygen atmosphere using 60 Co grays. It was shown that two processes are involved in the EPDM radio-oxidation. The random g-radiolysis of the polymer provides a constant source of macro-alkyl radicals that are likely to initiate a selective oxidation of the polymer through free-radicals reactions involving the abstraction of labile hydrogen atoms. In the present paper, infrared spectroscopy has been used to study the g-degradation of EPDM cross-linked with dicumyl peroxide and/or stabilised with two types of anti-oxidants (hindered phenol or amine-type). The results show that the anti-oxidants are not efficient in preventing oxidation. To understand the lack of efficiency of the stabilisers, the impacts of the various formulations on the rate of degradation of EPDM against chain oxidation involved in thermal and UV ageing were also studied.

show abstract

“…These additives, which present convenient stability on high‐energy irradiation, act as radical scavengers 5. Other types of antioxidants acting as energy scavengers have also been reported in literature such as triazine,6 propylfluoranthene,7 pyrene,8 and other polynuclear hydrocarbons 9. In spite of their effectiveness in protecting polymers against oxidation, many of these stabilizers migrate throughout plastics during their lifetime, bringing changes in the main properties of materials 10–13.…”

Section: Introductionmentioning

confidence: 94%

Grafting of Hindered Amine Stabilizer in Poly(propylene) Films under γ‐Irradiation

Kaci

Touati

Setnescu

et al. 2005

Macro Materials & Eng

View full text Add to dashboard Cite

Summary: In this paper, the grafting of a hindered amine stabilizer (HAS) is studied in isotactic poly(propylene) (PP) films under γ‐irradiation. The HAS used has a definite structure that combines a hindered amine functionality and a UV‐absorbing unit (benzylidene malonate ester group) detectable at 308 nm in the UV spectrum of PP film and 314 nm in chloroform. The stabilizer is added to the polymer at various concentration ratios: 0.1, 0.2, and 0.3 wt.‐%. The percentage of HAS grafting in the PP film at various additive concentrations is determined as a function of γ‐radiation dose in the range of 0–100 kGy by direct spectroscopic measurements through the absorption band of the stabilizer in the UV spectra of the PP film. The percentage of free HAS extracted with chloroform from the PP film versus the radiation dose is determined by UV spectroscopy for all the additive concentrations used. This study reveals that only 80% of the HAS is grafted on the 100 kGy irradiated PP matrix independent of the additive concentration used. However, the percentage of HAS grafted on PP films displays an exponential dependence on γ‐radiation dose. These results are consistent with the data obtained on the free HAS content. γ‐Irradiation grafting of HAS in the PP is accompanied by the oxidative degradation of the polymer substrate that is evaluated by increasing the carbonyl index and reducing significantly the oxidation induction time of the PP films.

show abstract

Radiation‐induced oxidation of polymers. Effect of antioxidant and antirad agent on oxygen consumption and gas evolution

Cited by 31 publications

References 10 publications

The effect of oxygen on the irradiation process of ethylene–butene copolymer

The effect of oxygen on the irradiation process of ethylene–butene copolymer

Radiochemical ageing of ethylene–propylene–diene elastomers. 4. Evaluation of some anti-oxidants

Grafting of Hindered Amine Stabilizer in Poly(propylene) Films under γ‐Irradiation

Contact Info

Product

Resources

About