Polypropylene Degradation by γ-Irradiation in Air

Carlsson, D. J.; Dobbin, C. J. B.; Jensen, Jacob Hjelmager; Wiles, D. M.

doi:10.1021/bk-1985-0280.ch025

Cited by 26 publications

(9 citation statements)

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“…Although Carlsson et al (1985) and Lacoste and Carlsson (1992) state that oxidized plastic polymers are always unstable at room temperature in the dark, and should be stored at −30°C to limit continued slow oxidation, they base this recommendation on Carlsson et al's aging experiment with PP exposed to gamma irradiation. In contrast, our experiment, with natural radiance including UV wavelengths, exhibited stable baselines in the controls.…”

Section: Discussionmentioning

confidence: 99%

Long-term aging and degradation of microplastic particles: Comparing in situ oceanic and experimental weathering patterns

Brandon

Goldstein

Ohman

2016

Marine Pollution Bulletin

457

218

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Polypropylene, low-density polyethylene, and high-density polyethylene pre-production plastic pellets were weathered for three years in three experimental treatments: dry/sunlight, seawater/sunlight, and seawater/darkness. Changes in chemical bond structures (hydroxyl, carbonyl groups and carbon-oxygen) with weathering were measured via Fourier Transform Infrared (FTIR) spectroscopy. These indices from experimentally weathered particles were compared to microplastic particles collected from oceanic surface waters in the California Current, the North Pacific Subtropical Gyre, and the transition region between the two, in order to estimate the exposure time of the oceanic plastics. Although chemical bonds exhibited some nonlinear changes with environmental exposure, they can potentially approximate the weathering time of some plastics, especially high-density polyethylene. The majority of the North Pacific Subtropical Gyre polyethylene particles we measured have inferred exposure times>18months, with some >30months. Inferred particle weathering times are consistent with ocean circulation models suggesting a long residence time in the open ocean.

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Section: Discussionmentioning

confidence: 99%

Long-term aging and degradation of microplastic particles: Comparing in situ oceanic and experimental weathering patterns

Brandon

Goldstein

Ohman

2016

Marine Pollution Bulletin

457

218

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“…Postirradiation aging occurs as free radicals formed during irradiation react after the irradiation has ceased. 13 It is widely reported that radiation introduces major deterioration in mechanical properties of polypropylene as a consequence of the chain scission and crosslinking. 14 -19 A number of studies have indicated that changing the crystallinity or other morphological features can affect the response of polypropylene to radiation-induced degradation.…”

Section: Introductionmentioning

confidence: 99%

The morphology of irradiated isotactic polypropylene

Zhang

Cameron

1999

J. Appl. Polym. Sci.

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ABSTRACT:The research in this article explores the response of semicrystalline isotactic polypropylene to gamma radiation in air, and relates the morphological changes of the polymer to corresponding changes in mechanical properties. The effect of the initial morphology of the polymer on its response to irradiation is considered using infrared spectroscopy (FTIR), small-and wide-angle X-ray scattering, dynamic mechanical thermal analysis (DMTA), and mechanical testing. The extent of chain scission and crosslinking is dependent on the dose but not the initial starting morphology. These chemical changes cause the crystallinity to increase slightly, and the glass transition temperature to rise by a few degrees in all samples, but the overall morphology is only subtly changed. In contrast, a major deterioration in mechanical properties is caused. The effects of the irradiation observed under these conditions are similar in each material and the ultimate properties determined by the properties seen in the original material.

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“…The hydroxyl group at v 5 34008cm 21 also increased (-O-H). Both bandwidths indicate a thermal-oxidation degradation of the PP [22][23][24].…”

Section: Resultsmentioning

confidence: 99%

Changes in the mechanical properties of laser-welded polymer specimens of polypropylene and polycarbonate through different sterilization procedures

Holl

Seul

2016

Polym Eng Sci

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Microorganisms on components should be killed through sterilization in order to ensure the safe use of medical products for patients. Therefore, polymer parts are treated particularly with gamma radiation, ethylene oxide, or superheated steam; such treatment may result in a modified structure or the degradation of the polymer. The present paper shall demonstrate how the mechanical properties of tension bars and welded samples of polypropylene and polycarbonate change during the sterilization procedure. The resulting changes in the structure and the degradation respectively will be analyzed by Fourier transform infrared spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC) and structural property relationships shall be derived. The conducted analyses showed that the changes in the mechanical properties depend on the sample, the sterilization procedure, and the corresponding polymer; and that those changes must be considered when designing the respective products. POLYM. ENG. SCI.,

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Polypropylene Degradation by γ-Irradiation in Air

Cited by 26 publications

References 0 publications

Long-term aging and degradation of microplastic particles: Comparing in situ oceanic and experimental weathering patterns

Long-term aging and degradation of microplastic particles: Comparing in situ oceanic and experimental weathering patterns

The morphology of irradiated isotactic polypropylene

Changes in the mechanical properties of laser-welded polymer specimens of polypropylene and polycarbonate through different sterilization procedures

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