書誌事項
- タイトル別名
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- Polymeric Antioxidants.IV
- コウブンシ サンカ ボウシザイ ノ ケンキュウ 4 オルトイ デ チョクセツ
- Phenolic Oligomers Having Direct Linkage at <I>Ortho</I> Positions
- オルト位で直接結合したフェノールオリゴマーについて
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抄録
Phenolic oligomers directly linked to aromatic rings were prepared by horseradish peroxidase catalyzed oxidation of phenol derivatives by hydrogen peroxide. The phenols used were p-cresol, p-ethylphenol, p-s-butylphenol, p-t-butylphenol, p-methoxyphenol, p-nonylphenol, m-cresol, m-t-butyl-phenol, m-methoxyphenol, and 3, 4-xylenol. p-Nonylphenol and m-t-butylphenol were not polymerized by oxidation. Number-average molecular weights (Mn) of para alkyl substituted phenolic oligomers were about 800 and bulky substituted groups prevented decrease in the number of hydroxyl groups during polymerization. Mn of p-methoxyphenol oligomer was almost 1700. Meta substituted oligomers had lower Mn and a greater number of remaining hydroxyl groups (D.R.H.) than the corresponding para substituted phenol oligomers. Antioxidant effects of the phenolic oligomers on the autoxidation of lard were evaluated. Improvement of this effect for lard could hardly be detected by polymerization. That of the oligomers on the autoxidation of tetralin was much more pronounced than for the corresponding monomers, except for p-methoxyphenol. Higher reactivity of phenolic oligomers toward peroxyl radicals and the formation of stable phenoxyl radicals may possibly have been the cause for this. Phenolic oligomers having higher D.R.H. exhibited the better antioxidant effect. The antioxidant effects of meta substituted oligomers were greater than those of the corresponding para substituted oligomers.
収録刊行物
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- 油化学
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油化学 42 (9), 656-660, 1993
公益社団法人 日本油化学会
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詳細情報 詳細情報について
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- CRID
- 1390001205335723008
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- NII論文ID
- 10006943941
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- NII書誌ID
- AN00245435
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- ISSN
- 0513398X
- 18842003
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- NDL書誌ID
- 3839743
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可