Characterization of ultrahigh molecular weight polyethylene irradiated with ?-rays and electron beams to high doses

Ikada, Yoshito; Nakamura, K.; Ogata, Sakae; Makino, Keisuke; Tajima, Kunihiko; Endoh, N.; Hayashi, Toshio; Fujita, Shin-ichi; Fujisawa, Akira; Masuda, Shingo; Oonishi, Hironobu

doi:10.1002/(sici)1099-0518(19990115)37:2<159::aid-pola6>3.0.co;2-g

Cited by 64 publications

(39 citation statements)

References 22 publications

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“…Also, due to the low penetration of electron beam, radicals at higher density by the electron beam disappeared much faster. Ikada et al [12] also observed this radical recombination in ultrahigh molecular weight polyethylene.…”

Section: Change Of Viscosity By Ionizing Irradiationmentioning

confidence: 81%

Comparison of gamma ray and electron beam irradiations on the degradation of carboxymethylcellulose

Choi

Kim

Lee

et al. 2009

Korean J. Chem. Eng.

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Carboxymethylcellulose (CMC) is used for a variety of applications due to its superior properties of high viscosity at a low concentration. In this study, the difference between a gamma ray (GR) irradiation from Co-60 and an electron beam (EB) irradiation with 10 MeV Energy on the viscosity change in CMC solution was compared. At the same irradiation doses, the viscosity of the CMC solution was more severely decreased by GR. Electron spin resonance spectroscopy revealed that the radicals in the CMC were more generated by GR, but there was no difference in the Fourier transform infrared spectra of both irradiated CMC solutions. Also, the degree of substitution in CMC was not changed by both irradiation events. From these results, it can be concluded that EB irradiation could better minimize the decrease in the viscosity of the solution with CMC for the sterilization than GR.

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Section: Change Of Viscosity By Ionizing Irradiationmentioning

confidence: 81%

Comparison of gamma ray and electron beam irradiations on the degradation of carboxymethylcellulose

Choi

Kim

Lee

et al. 2009

Korean J. Chem. Eng.

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“…Therefore, it may play a role the synthesis of labile compounds if the rate constant of the process times the species concentration is high enough with respect to that of molecular oxygen. This step, which is reversible, is controlled by oxygen diffusion as shown by various works [35][36][37]. It means that oxygen molecular species from the gas phase go through each SA droplet.…”

Section: Resultsmentioning

confidence: 99%

Interaction Mechanisms Between Ar–O2 Post-Discharge and Stearic Acid I: Behaviour of Thin Films

Bernardelli

Belmonte

Duday³

et al. 2010

Plasma Chem Plasma Process

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Interactions between a late Ar-O 2 post-discharge and thin films (*1 -2 lm) of stearic acid (SA), a C 17 aliphatic chain with as end-group a carboxylic acid function, are studied. Thin films grown by evaporation are made of separated droplets and are efficiently etched by the post-discharge to get a clean surface after treatment. The dewetting of the droplets during the first minutes of the treatment leads first to a more homogeneous film in thickness which is etched until isolated islands appear and progressively shrink as a function of time. The etching of the SA occurs via C-C bonds scission when peroxide or hydroperoxide compounds are synthesized from radicals initiated by reaction with atomic oxygen from the post-discharge. A strong functionalization by OH groups grafted on the aliphatic skeleton of the SA is also observed. C = O formation is observed for longer treatment times possibly due to oxidation of OH grafted on the aliphatic chain or to a modification of the branching ratio of the C-C bond scission mechanism due a temperature rise. The acid functional group is likely not modified by the treatment.

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“…With e-beam irradiation, the dose rate is orders of magnitude higher than with gamma radiation (10 kGy/s with e-beam versus 1-10 kGy/h with gamma irradiation), and the irradiation time is on the order of seconds with e-beam, as opposed to hours with gamma irradiation. Comparing the two irradiation methods under the same conditions and the same dispensed doses, it has been observed that amount of oxidation was lower after e-beam irradiation than when gamma rays were used, due to the difference in dose rates and the ability of oxygen to diffuse into the UHMWPE during the longer irradiation times used with gamma irradiation [45].…”

Section: Distribution Of Oxidized Compounds In the New Uhmwpe Prosthementioning

confidence: 99%

Mechanisms of Crosslinking, Oxidative Degradation and Stabilization of UHMWPE

Costa

Bracco

2009

UHMWPE Biomaterials Handbook

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Characterization of ultrahigh molecular weight polyethylene irradiated with ?-rays and electron beams to high doses

Cited by 64 publications

References 22 publications

Comparison of gamma ray and electron beam irradiations on the degradation of carboxymethylcellulose

Comparison of gamma ray and electron beam irradiations on the degradation of carboxymethylcellulose

Interaction Mechanisms Between Ar–O2 Post-Discharge and Stearic Acid I: Behaviour of Thin Films

Mechanisms of Crosslinking, Oxidative Degradation and Stabilization of UHMWPE

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