Phenolic antioxidants:: effect of o-benzyl substituents

被引：22

作者：

Matsuura, T ^{[1
]}

Ohkatsu, Y ^{[1
]}

机构：

[1] Kogakuin Univ, Fac Engn, Dept Appl Chem, Shinjuku Ku, Tokyo 1638677, Japan

来源：

POLYMER DEGRADATION AND STABILITY | 2000年 / 70卷 / 01期

关键词：

antioxidant; benzyl substituent; phenols; substituent effect; high activity;

D O I：

10.1016/S0141-3910(00)00088-4

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A previous study showed that a substituent with an cc-hydrogen atom on an o-position of a phenolic antioxidant enhances the antioxidative activity. The ct-hydrogen atom can stabilize a phenoxy radical and is finally moved to the phenoxy radical to regenerate a new phenol. In this study, new o-substituted phenolic antioxidants, having such hydrogen atom(s), are molecularly-designed. They include o-benzyl-substituted phenols having a methyl, methoxy, phenyl, or halogen group on the o- or p- positions of the benzyl substituent and also a methylene group activated by two phenyl groups. As expected, almost all new phenols exhibited high activities, trapping 3-4 peroxy radicals and having radical-trapping rate constants of 1.5 or more times higher than that of BHT. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：59 / 63

页数：5

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