Chemiluminescence study on the oxidation of several polyolefins: II. Chemiluminescence from γ-irradiated polymers

Setnescu, Radu; Jipa, S.; Setnescu, Tanţa; Podină, C.; Osawa, Zenjiro

doi:10.1016/s0141-3910(97)00137-7

Cited by 33 publications

(17 citation statements)

References 19 publications

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“…Carbonyls initiate photooxidation [2], so the kinetics of this process needs to be studied in order to better understand photodegradation. Though much work has been done on the photodegradation of different polymers, only a few studies have focused on the use of fluorescence spectroscopy for this task [3][4][5][6][7][8][9][10][11]. Briassoulis et al [4] have presented a simple four-step mechanism for the photo-oxidation process.…”

Section: Introductionmentioning

confidence: 99%

Characterization of high-density polyethylene using laser-induced fluorescence (LIF)

Htun

2012

J Polym Res

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Fluorescence intensity decays of high-density polyethylene (HDPE) films have been studied by laserinduced fluorescence (LIF). An internally cavity-dumped dye laser synchronously pumped with a mode-locked argon-ion laser was used to excite the HDPE samples. The decay in the fluorescence intensity of HDPE film is due to the carbonyl present in the film, and was shown to be dependent on the power density of the incident UV light. The fluorescence intensity decay exhibits second-order kinetics. The experimental results obtained here demonstrate that the photostability of HDPE films can be characterized by the rate coefficient of the fluorescence intensity decay.

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Section: Introductionmentioning

confidence: 99%

Characterization of high-density polyethylene using laser-induced fluorescence (LIF)

Htun

2012

J Polym Res

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“…Polymers oriented via solid-state stretching at an elevated temperature close to -but below -the melting temperature have structures of reduced stability with respect to static loading for prolonged periods of time. The influence of molecular orientation on radiationinduced crosslinking/degradation, and vice versa, has received considerable attention in the past, and periodic reviews on this subject are available [7,[9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Irradiation of oriented polyolefines primarily results in the crosslinking of the amorphous phase, stopping the viscous flow and changing the viscoelastic characteristics [21,22].…”

Section: Introductionmentioning

confidence: 99%

The influence of orientation on the radiation-induced crosslinking/oxidative behavior of different PEs

Miličević

Trifunović

Popović

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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“…Several classes of antioxidants were intensively studied for various purposes: prevention of thermal degradation [6][7][8] or weather aging [9][10][11][12] , and radiation stability. [13][14][15] The majority of products reach high performances due to protective action of antioxidants, which confer excellent protection against the action of permanent Summary: The thermal stability of gamma irradiated low density polyethylene (LDPE) films in presence of various structures of hindered amine stabilizers (HAS) was investigated by the oxygen uptake method under constant temperature of 180 8C and normal pressure conditions. The thermooxidation was run using air environment.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Gamma Irradiated Low Density Polyethylene Films Containing Hindered Amine Stabilizers

Zaharescu¹,

Kaci

Hebal

et al. 2004

Macro Materials & Eng

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Summary: The thermal stability of gamma irradiated low density polyethylene (LDPE) films in presence of various structures of hindered amine stabilizers (HAS) was investigated by the oxygen uptake method under constant temperature of 180 °C and normal pressure conditions. The thermo‐oxidation was run using air environment. The sigmoidal dependency of oxygen uptake allows the calculation of the main kinetic parameters: oxidation induction time and oxidation rate on the propagation step. The various steps involved in the thermal degradation process were detected by the derivative procedure applied to the dependencies of oxygen uptake on time. It was found that the kinetic parameters of the thermal degradation process, determined by oxygen uptake, revealed the antioxidant role of HAS in γ‐irradiated LDPE films by providing better stability, when compared with the unstabilized samples. Moreover, the results indicated that the dependencies of oxygen uptake on thermal degradation time involved two degradation stages: the former occurring in the ungrafted moiety and the latter taking place after the antioxidant depletion is achieved. The stabilization efficiency of these oxidation inhibitors provides satisfactory thermal resistance to LDPE films, especially those based on an alkoxyamine structure.Dependencies of oxygen uptake on time at the thermal degradation of LDPE irradiated at 812 kGy. (‐□‐) free of additive; (‐○‐) Tinuvin 123; (‐▵‐) Sanduvor PR 31; (‐⋄‐) Uvasil 299.magnified imageDependencies of oxygen uptake on time at the thermal degradation of LDPE irradiated at 812 kGy. (‐□‐) free of additive; (‐○‐) Tinuvin 123; (‐▵‐) Sanduvor PR 31; (‐⋄‐) Uvasil 299.

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Chemiluminescence study on the oxidation of several polyolefins: II. Chemiluminescence from γ-irradiated polymers

Cited by 33 publications

References 19 publications

Characterization of high-density polyethylene using laser-induced fluorescence (LIF)

Characterization of high-density polyethylene using laser-induced fluorescence (LIF)

The influence of orientation on the radiation-induced crosslinking/oxidative behavior of different PEs

Thermal Stability of Gamma Irradiated Low Density Polyethylene Films Containing Hindered Amine Stabilizers

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