A Mechanism for the Oxidative Photodegradation of Polyethylene

Trozzolo, A. M.; Winslow, F. H.

doi:10.1021/ma60001a019

Cited by 128 publications

(28 citation statements)

References 1 publication

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“…The fluorescence intensity of the carbonyl at 355 nm decreases with increasing UV exposure time. It is understood that the excited carbonyl undergoes chain scission by photochemical α-cleavage of carbonyl groups (Norrish type I) and/or intramolecular abstraction of a γ-hydrogen (Norrish type II) [1,10,18]. In addition, the excited carbonyl loses some of its fluorescence intensity due to an interaction with hydroperoxide.…”

Section: Fluorescence Emissionmentioning

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: Fluorescence Emissionmentioning

confidence: 99%

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

Htun

2012

J Polym Res

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“…The changes within ECO's chemical and physical properties and structures are well understood (Trozzolo and Winslow, 1968;Hartley and Guillet, 1968;Heskins and Guillet, 1970;Li and Guillet, 1980;Torikai et. al., 1986;Nakatsuka and Andrady, 1994).…”

Section: Thesis Outlinementioning

confidence: 99%

Crack Path Selection in Microstructurally Tailored Inhomogeneous Polymers

Gonzalez

Lambros

2012

Exp Mech

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In this work, the wide range of properties of a photodegradable polymer are exploited to generate a host of different inhomogeneous arrangements that can help us experimentally study crack path selection problems. The model material which we are using is a polyethylene copolymer, ECO, whose photosensitive behavior allows alterations in its mechanical properties when subjected to ultraviolet (UV) irradiation. It is seen that ECO becomes stiffer but more

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“…The possible participation of singlet oxygen in the photo-oxidation of polymers was mentioned for the first time by Trozzolo and Winslow ten years ago (8) . These authors have suggested that carbonyl groups present as impurities in polyethylene might transfer energy to oxygen, thereby forming excited molecular oxygen in its state.…”

Section: The Singlet Oxygen Mechanism Of Oxidationmentioning

confidence: 99%

“…The arguments are based usually on the fact that a given polymer reacts in the solid state with singlet oxygen produced by microwave discharge or in solution with the same reactive species generated by energy transfer from suitable sensitizers. It has been shown quite conclusively that singlet oxygen produced by microwave discharge do not react with polyethylene or other saturated chain polymers (9) (10) while in the same conditions polybutadiene and polyisoprene react readily to produce hydroperoxide groups (8) (11) .…”

Section: The Singlet Oxygen Mechanism Of Oxidationmentioning

confidence: 99%

The Photo-Oxidation of Polymers. A Comparison With Low Molecular Weight Compounds

Geuskens¹,

David²

1979

Photochemistry–7

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-The photo-oxidation of polymers involves different steps in which their reactivity is different from that of low molecular weight conpounds. This is mainly due to the close vicinity of reactive groups in polymers and to the rigidity of the matrix. As a consequence, transfer of energy has a major role in the initiation of the photo-oxidation of most polymers on exposure to sunlight. It results in the sensitized decomposition of neighbouring hydroperoxide groups which, however, produce free radicals and thus initiate the oxidation less efficiently than model compounds in fluid solution. Scission of the polymer backbone, responsible for the alteration of the physical and mechanical properties, involves the decomposition of isolated hydroperoxide groups by two different mechanisms the relative importance of which changes with temperature.

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A Mechanism for the Oxidative Photodegradation of Polyethylene

Cited by 128 publications

References 1 publication

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

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

Crack Path Selection in Microstructurally Tailored Inhomogeneous Polymers

The Photo-Oxidation of Polymers. A Comparison With Low Molecular Weight Compounds

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