Mechanical changes of electron beam irradiated ethylene–vinyl acetate copolymer (EVA) film (I)

Toshiro Matsui, Mitsuya Shimoda, Yutaka Osajima

研究成果: ジャーナルへの寄稿記事

9 引用 (Scopus)

抄録

Electron beam irradiation of ethylene‐vinyl acetate copolymer (EVA) film results in a marked depression of sorption of flavour compounds. This effect is presumed to be brought about by radical reactions, following changes in the structure. The crosslinking density and gel fraction increased with irradiation dose, and the maximum percent gel reached 70% for 20 Mrad‐50g kg−1 EVA film, 35% for 20 Mrad‐95g kg−1 EVA film and 50% for 10 Mrad‐150g kg−1 EVA film. In calculating the ratio of scission to crosslinking events, it was found that EVA film is a polymer of the scission type. The degree of crystallinity, Xc decreased significantly with increasing irradiation dose in all irradiated films. For unirradiated films, Xc decreased with increase in vinyl acetate content, which suggests that crystalline regions of EVA film are primarily composed of ethylene units. Therefore, the scission reaction may predominantly take place in the crystalline region, resulting in the formation of methyl or end vinyl groups. This was supported by measuring the film density, peak melting temperature and stress at yield.

元の言語英語
ページ(範囲)85-90
ページ数6
ジャーナルPolymer International
29
発行部数2
DOI
出版物ステータス出版済み - 1 1 1992

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Electron beams
Acetates
Copolymers
Irradiation
Crosslinking
Dosimetry
Flavor compounds
Gels
Crystalline materials
Melting point
Sorption
Polymers
Ethylene

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

これを引用

Mechanical changes of electron beam irradiated ethylene–vinyl acetate copolymer (EVA) film (I). / Matsui, Toshiro; Shimoda, Mitsuya; Osajima, Yutaka.

:: Polymer International, 巻 29, 番号 2, 01.01.1992, p. 85-90.

研究成果: ジャーナルへの寄稿記事

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abstract = "Electron beam irradiation of ethylene‐vinyl acetate copolymer (EVA) film results in a marked depression of sorption of flavour compounds. This effect is presumed to be brought about by radical reactions, following changes in the structure. The crosslinking density and gel fraction increased with irradiation dose, and the maximum percent gel reached 70{\%} for 20 Mrad‐50g kg−1 EVA film, 35{\%} for 20 Mrad‐95g kg−1 EVA film and 50{\%} for 10 Mrad‐150g kg−1 EVA film. In calculating the ratio of scission to crosslinking events, it was found that EVA film is a polymer of the scission type. The degree of crystallinity, Xc decreased significantly with increasing irradiation dose in all irradiated films. For unirradiated films, Xc decreased with increase in vinyl acetate content, which suggests that crystalline regions of EVA film are primarily composed of ethylene units. Therefore, the scission reaction may predominantly take place in the crystalline region, resulting in the formation of methyl or end vinyl groups. This was supported by measuring the film density, peak melting temperature and stress at yield.",
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N2 - Electron beam irradiation of ethylene‐vinyl acetate copolymer (EVA) film results in a marked depression of sorption of flavour compounds. This effect is presumed to be brought about by radical reactions, following changes in the structure. The crosslinking density and gel fraction increased with irradiation dose, and the maximum percent gel reached 70% for 20 Mrad‐50g kg−1 EVA film, 35% for 20 Mrad‐95g kg−1 EVA film and 50% for 10 Mrad‐150g kg−1 EVA film. In calculating the ratio of scission to crosslinking events, it was found that EVA film is a polymer of the scission type. The degree of crystallinity, Xc decreased significantly with increasing irradiation dose in all irradiated films. For unirradiated films, Xc decreased with increase in vinyl acetate content, which suggests that crystalline regions of EVA film are primarily composed of ethylene units. Therefore, the scission reaction may predominantly take place in the crystalline region, resulting in the formation of methyl or end vinyl groups. This was supported by measuring the film density, peak melting temperature and stress at yield.

AB - Electron beam irradiation of ethylene‐vinyl acetate copolymer (EVA) film results in a marked depression of sorption of flavour compounds. This effect is presumed to be brought about by radical reactions, following changes in the structure. The crosslinking density and gel fraction increased with irradiation dose, and the maximum percent gel reached 70% for 20 Mrad‐50g kg−1 EVA film, 35% for 20 Mrad‐95g kg−1 EVA film and 50% for 10 Mrad‐150g kg−1 EVA film. In calculating the ratio of scission to crosslinking events, it was found that EVA film is a polymer of the scission type. The degree of crystallinity, Xc decreased significantly with increasing irradiation dose in all irradiated films. For unirradiated films, Xc decreased with increase in vinyl acetate content, which suggests that crystalline regions of EVA film are primarily composed of ethylene units. Therefore, the scission reaction may predominantly take place in the crystalline region, resulting in the formation of methyl or end vinyl groups. This was supported by measuring the film density, peak melting temperature and stress at yield.

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