The cooperative effect between pyrene and a radical scavenger in stabilization of LDPE as studied by chemiluminescence

Jipa, S.; Nishimoto, M.; Otsuki, Harumi; Osawa, Zenjiro

doi:10.1016/0141-3910(96)00140-1

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…Chemiluminescence measurement has been used as a tool for the investigation of the oxidation of various polymers or polymer materials at elevated temperatures,4–11 solar or UV light,12–15 cold helium plasma,16 electrical stress,17 electron beam18 and γ‐ray irradiation 19, 20. Many attempts have been made to use chemiluminescence for estimation the efficiency of stabilizers 21–28…”

Section: Introductionmentioning

confidence: 99%

Chemiluminescence of isotactic polypropylene induced by photo‐oxidative degradation and natural weathering

Jipa

Setnescu

Zaharescu³

et al. 2006

J of Applied Polymer Sci

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The analysis of the chemiluminescence (CL) kinetic parameters (induction time, oxidation rate, and activation energy) after the UV irradiation and outdoor exposure of isotactic polypropylene (i-PP) films have been studied. The initial CL emission intensity increased with increasing photodegradation time of i-PP films. On photodegradation, the activation energies were found to decrease linearly with time of UV-irradiation and outdoor exposure.The slopes of these linear dependences were used to indicate the degree of photodegradation of the polymer and also for the characterization of the stabilizing effect of the additive.

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Section: Introductionmentioning

confidence: 99%

Chemiluminescence of isotactic polypropylene induced by photo‐oxidative degradation and natural weathering

Jipa

Setnescu

Zaharescu³

et al. 2006

J of Applied Polymer Sci

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“…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: 93%

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

Kaci

Touati

Setnescu

et al. 2005

Macro Materials & Eng

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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.

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“…Heating of polyolefins in the presence of air changes their fluorescence intensity (Figure 13.27). [330][331][332] Chemiluminescence was used to identify luminescent species which cause yellowing of PET. It is very difficult to obtain repeatable measurements because the intensity of the spectrum is sensitive to the position and orientation of the specimen in the instrument.…”

Section: Chemiluminescence Fluorescence  and Phosphorescencementioning

confidence: 99%

Testing Methods of Weathered Specimen

Wypych¹

2013

Handbook of Material Weathering

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The cooperative effect between pyrene and a radical scavenger in stabilization of LDPE as studied by chemiluminescence

Cited by 13 publications

References 10 publications

Chemiluminescence of isotactic polypropylene induced by photo‐oxidative degradation and natural weathering

Chemiluminescence of isotactic polypropylene induced by photo‐oxidative degradation and natural weathering

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

Testing Methods of Weathered Specimen

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