Authors:
K. Ito The University of Tokyo Graduate School of Engineering 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656 Japan

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Li Hong-ling The University of Tokyo Graduate School of Engineering 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656 Japan

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Y. Saito Japan Atomic Energy Research Institute (JAERI) Department of Environmental Sciences Tokai, Naka-gun, Ibaraki 319-1195 Japan

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T Yamamoto The Nippon Synthetic Chemical Industry Co., Ltd Physics and Analysis Research Center, Central Research Laboratory 13-1, Muroyama 2-chome Ibaraki, Osaka 567-0052 Japan

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Y. Nishihara The Nippon Synthetic Chemical Industry Co., Ltd Physics and Analysis Research Center, Central Research Laboratory 13-1, Muroyama 2-chome Ibaraki, Osaka 567-0052 Japan

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Y. Ujihira The University of Tokyo Graduate School of Engineering 7-3-1 Hongo Bunkyo-ku, Tokyo 113-8656 Japan

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K. Nomura The University of Tokyo School of Engineering Hongo 7-3-1 Bunkyo-ku, Tokyo 113-8656

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Abstract  

The free-volume, of size ranging from 0.2 to 0.4 nm in radius, in an ethylene-vinyl alcohol copolymer was estimated using positronium lifetime measurement to elucidate the dependence of oxygen permeability on the free-volume size and fraction, on the ethylene content and on the crystallinity. The permeability and the free-volume fraction with varying the ethylene content were well related and the relation was interpreted based on the free-volume theory near below and above the glass transition temperature. On the other hand, the crystallinity significantly influenced the fraction of the amorphous region, where the free-volume hole exists, along with a slight change of the free-volume size. The variation of the permeability with the crystalline degree cannot be explained from the averaged free-volume fraction estimated by the whole volume of the polymer, but the permeability correlated with the free-volume size apparently.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)