Radiolytic Formation and Decay of <i>trans</i>-Vinylene Unsaturation in Polyethylene

Lyons, B. J.; Johnson, William C.

doi:10.1021/bk-1993-0527.ch005

Cited by 8 publications

(9 citation statements)

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“…Spectra were run in transmission mode, with a 4 cm −1 resolution and 16 scans per spectrum. Because the concentration of carbon double bonds in PE (CC) is a function of the absorbed radiation dose,15, 16 the trans ‐vinylene levels were assessed using FTIR to confirm that components had been irradiated and the dose absorbed. In preparation for FTIR analysis, the UHMWPE components were initially cut into half and sectioned using a microtome into 180‐μm‐thick specimens 17.…”

Section: Methodsmentioning

confidence: 99%

Oxidation and oxidation potential in contemporary packaging for polyethylene total joint replacement components

et al. 2006

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The packaging and chemical stability of both conventional and highly crosslinked polyethylene (PE) components available for clinical use in Italy were analyzed. A total of 100 sterilized PE components were entered by 18 orthopedic manufacturers into the study. Six of the manufacturers were Italian and the remaining were based in Europe or America. Hydroperoxide, oxidation, and trans-vinylene levels within the PE components were characterized using Fourier-transform infrared spectroscopy (FTIR). None of the 31 gas-sterilized components had detectable free radicals, hydroperoxide content, or oxidation. Among radiation-sterilized inserts, the highest oxidation and hydroperoxide levels were associated with gas-permeable and polymer-barrier packaging. To the authors' knowledge, this is the first study that relates elevated oxidation and hydroperoxide content in gamma-sterilized PE components to certain types of contemporary, polymeric barrier packaging.

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Section: Methodsmentioning

confidence: 99%

Oxidation and oxidation potential in contemporary packaging for polyethylene total joint replacement components

et al. 2006

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“…Chain scission, crosslinking, and the formation of trans ‐vinylene units are the most common radiolytic reactions in UHMWPE. trans ‐Vinylene unsaturations are radiolytically formed by ionization, followed by detachment of a hydrogen molecule and, to a lesser extent (5%), by the recombination of two adjacent alkyl free radicals residing on the same chain 11, 12…”

Section: Introductionmentioning

confidence: 99%

Identification and quantification of irradiation in UHMWPE throughtrans-vinylene yield

Muratoglu

Harris

2001

J. Biomed. Mater. Res.

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trans-Vinylene unsaturations generated in ultrahigh-molecular-weight polyethylene (UHMWPE) after radiation treatment scales linearly with the absorbed dose level, and can serve as an internal dosimeter for determining the radiation dose level for sterilizing or crosslinking UHMWPE. We measured the trans-vinylene concentration using infrared spectroscopy and generated calibration curves for ultrahigh-molecular-weight polyethylene (ram-extruded GUR 1050) after cold e-beam, cold gamma, and warm e-beam irradiations. The trans-vinylene content increased linearly with the absorbed dose level in all cases except with cold gamma irradiation at dose levels higher than approximately 70 kGy. At that dose level the trans-vinylene content of the warm irradiated samples was higher than those of the cold irradiated samples. Following postirradiation melting, the trans-vinylene content of the gamma irradiated samples increased. Such trans-vinylene quantification can be an internal dosimeter for crosslinked UHMWPE when radiation is used for improving its wear resistance or sterilizing the device made thereof. It can also be utilized to assess the spatial uniformity of the absorbed radiation dose level.

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“…Lyons and Crook (1963), however, found that there was a considerable difference between the results obtained by them and by Dole et al (1958a, b) for trans-vinylene unsaturation growth, especially at higher doses. These differences reflect, as has been discussed separately (Lyons and Johnson, 1993), a pronounced sensitivity of the trans-vinylene decay reaction to the presence of radiolytically produced hydrogen gas.…”

Section: General Comments On the Experimental Procedures Usedmentioning

confidence: 54%

Radiolytic unsaturation decay in polyethylene. Part I—general review and analysis with additional new work

Lyons¹

2004

Radiation Physics and Chemistry

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Radiolytic Formation and Decay of trans-Vinylene Unsaturation in Polyethylene

Cited by 8 publications

References 0 publications

Oxidation and oxidation potential in contemporary packaging for polyethylene total joint replacement components

Oxidation and oxidation potential in contemporary packaging for polyethylene total joint replacement components

Identification and quantification of irradiation in UHMWPE throughtrans-vinylene yield

Radiolytic unsaturation decay in polyethylene. Part I—general review and analysis with additional new work

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