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Durability of radiation‐sterilized polymers III. Oxidation layer determined by chemiluminescence
Author(s) -
Yoshii Fumio,
Sasaki Takashi,
Makuuchi Keizo,
Tamura Naouki
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070310518
Subject(s) - irradiation , polypropylene , chemiluminescence , materials science , polyethylene , surface layer , layer (electronics) , polymer , oxygen , diffusion , redox , analytical chemistry (journal) , polymer chemistry , chemistry , composite material , organic chemistry , metallurgy , physics , nuclear physics , thermodynamics
Chemiluminescence (CL) analysis was used for determining the oxidation layer formed by the irradiation of polypropylene for medical supplies. The depth of the oxidation layer from the surface depended on dose rate and increased with decreasing dose rate. The oxidation occurred remarkably at a region near the surface area of the film where the diffusion of oxygen is more sufficient. On the contrary, there was very little oxidation in the interior portion. The oxidation layers of polypropylene samples irradiated with electron beam showed U‐shaped profiles in the cross‐section of film as did as a sample irradiated with γ‐rays. However, the degree of oxidation by irradiation with electron beam was very small; CL intensity at the surface area was only one‐third that for the γ‐irradiated samples.