On the Structural Analysis of γ-Ray Induced Primary Free Radicals in UHMWPE and Vitamin E Stabilized UHMWPE by ESR Spectroscopy
Joint Authors
Mehmood, Malik Sajjad
Jahan, Muhammad Shah
Yasin, Tariq
Tariq, Muhammad
Choudhry, Mohammad Ahmad
Ikram, Masroor
Source
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-04-05
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
Oriented allyl radicals are detected at room temperature in gamma irradiated UHMWPE.
The effects of vitamin E and storage at room temperature on this oriented structure are also investigated during the study.
While testing powder as well as compression-molded solids, with or without vitamin E, a typical ESR spectrum was recorded at room temperature following 100 kGy gamma dose and subsequent storage at −78.5°C for one year.
The simulated results show that the relative abundance of 5% alkyl, 68% allyl, and 27% polyenyl produced a 98.7% best fit of experimental ones.
Furthermore, the allyl radical signal gives approximately 20% of random orientations and 80% of oriented molecules.
In oriented PE, measured at −196°C, Ohnishi et al.
(1916) observed 25 lines within a total magnetic field width of approximately 133 G.
Our spectra also show 25 lines spread over 136 G in UHMWPE powder samples and at room temperature after one year of storage.
American Psychological Association (APA)
Mehmood, Malik Sajjad& Jahan, Muhammad Shah& Yasin, Tariq& Tariq, Muhammad& Choudhry, Mohammad Ahmad& Ikram, Masroor. 2015. On the Structural Analysis of γ-Ray Induced Primary Free Radicals in UHMWPE and Vitamin E Stabilized UHMWPE by ESR Spectroscopy. Journal of Spectroscopy،Vol. 2015, no. 2015, pp.1-8.
https://search.emarefa.net/detail/BIM-1070323
Modern Language Association (MLA)
Mehmood, Malik Sajjad…[et al.]. On the Structural Analysis of γ-Ray Induced Primary Free Radicals in UHMWPE and Vitamin E Stabilized UHMWPE by ESR Spectroscopy. Journal of Spectroscopy No. 2015 (2015), pp.1-8.
https://search.emarefa.net/detail/BIM-1070323
American Medical Association (AMA)
Mehmood, Malik Sajjad& Jahan, Muhammad Shah& Yasin, Tariq& Tariq, Muhammad& Choudhry, Mohammad Ahmad& Ikram, Masroor. On the Structural Analysis of γ-Ray Induced Primary Free Radicals in UHMWPE and Vitamin E Stabilized UHMWPE by ESR Spectroscopy. Journal of Spectroscopy. 2015. Vol. 2015, no. 2015, pp.1-8.
https://search.emarefa.net/detail/BIM-1070323
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1070323