Chemiluminescence study on irradiated low-density polyethylene containing various photo-stabilisers

Setnescu, Radu; Kaci, Mustapha; Jipa, S.; Setnescu, Tanţa; Zaharescu, Traian; Hebal, Ghania; Benhamida, Aida; Djedjelli, Hocine

doi:10.1016/j.polymdegradstab.2003.12.004

Cited by 12 publications

(5 citation statements)

References 21 publications

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“…In our case, we can clearly observe that Sanduvor PR 31 induces higher values of activation energy of thermal oxidation as compared to unstabilized samples. This effect can be related to an antioxidative effect of the HALS which can occur even at elevated temperatures, as previously reported in the literature19, 20 in the case of polyethylene. In fact, the occurrence of this effect allows us to apply CL in characterization of the HALS effectiveness and in evaluation of the extent of degradation effects.…”

Section: Resultssupporting

confidence: 76%

“…Chemiluminescence emission of film samples were obtained in an OL‐94 Oxyluminograph analyzer developed by ICPE‐CA (Bucharest, Romania) 35. The measurements were performed in isothermal mode and the kinetic parameters of oxidation were calculated from chemiluminescence curves in the same manner as it has been shown in the literature 13, 20…”

Section: Experimental Partmentioning

confidence: 99%

“…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%

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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: Resultssupporting

confidence: 76%

Section: Experimental Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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 initial intensity of CL emission is related to the concentration of peroxy species [ 74 ]. A value of 1.63 × 10 −3 Hz/g was found for the neat PLA/PEG system, while that of PLA/PEG/0.5R was 0.18 × 10 −3 Hz/g, about nine times lower than that of the system without R, indicating a good oxidative stabilization of the system is achieved through this additive.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Rosemary Extract Effect on the Properties of Polylactic Acid-Based Materials

Darie-Niță¹,

Vasile²,

Stoleru³

et al. 2018

Materials

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New multifunctional materials containing additives derived from natural resources as powdered rosemary ethanolic extract were obtained by melt mixing and processed in good conditions without degradation and loss of additives. Incorporation of powdered rosemary ethanolic extract (R) into poly(lactic acid) (PLA) improved elongation at break, rheological properties, antibacterial and antioxidant activities, in addition to the biocompatibility. The good accordance between results of the chemiluminescence method and radical scavenging activity determination by chemical method evidenced the increased thermoxidative stability of the PLA biocomposites with respect to neat PLA, with R acting as an antioxidant. PLA/R biocomposites also showed low permeability to gases and migration rates of the bioactive compounds and could be considered as high-performance materials for food packaging. In vitro biocompatibility based on the determination of surface properties demonstrated a good hydrophilicity, better spreading and division of fibroblasts, and increased platelet cohesion. The implantation of PLA/R pellets, was proven to possess a good in vivo biocompatibility, and resulted in similar changes in blood parameters and biochemical responses with the control group, suggesting that these PLA-based materials demonstrate very desirable properties as potential biomaterials, useful in human medicine for tissue engineering, wound management, orthopedic devices, scaffolds, drug delivery systems, etc. Therefore, PLA/R-based materials show promising properties for applications both in food packaging and as bioactive biomaterials.

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“…On increasing the radiation dose, the carbonyl index increases too; however, the increase seems to be more pronounced from 15 kGy. This result could be related to the grafting process that could enhance the oxidative resistance of the polymer 25,26. On the other hand, the curves describing the carbonyl index evolution of the HAS stabilized samples exhibit a similar profile.…”

Section: Resultsmentioning

confidence: 86%

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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Chemiluminescence study on irradiated low-density polyethylene containing various photo-stabilisers

Cited by 12 publications

References 21 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

Evaluation of the Rosemary Extract Effect on the Properties of Polylactic Acid-Based Materials

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

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