DETERMINATION OF PEROXIDES AND HYDROPEROXIDES WITH 2,2-DIPHENYL-1-PICRYLHYDRAZYL (DPPH) - APPLICATION TO OZONIZED ETHYLENE-VINYL ACETATE COPOLYMERS (EVA)

被引：37

作者：

FARGERE, T

ABDENNADHER, M

DELMAS, M

BOUTEVIN, B

机构：

[1] ECOLE NATL SUPER CHIM MONTPELLIER,CHIM APPL LAB D11930,CNRS URA,F-34053 MONTPELLIER,FRANCE

[2] ECOLE NATL SUPER CHIM,FIBRES ENERGIE BIOMONOMERES,F-31077 TOULOUSE,FRANCE

来源：

EUROPEAN POLYMER JOURNAL | 1995年 / 31卷 / 05期

关键词：

D O I：

10.1016/0014-3057(94)00201-0

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The compound 2,2-diphenyl-1-picrylhydrazyl (DPPH) is a stable free radical often used to determine the quantity and the decomposition rate constant of macroinitiators such as ozonized polymers. In fact, DPPH induces the decomposition of hydroperoxides and has no effect on the decomposition of peroxides. Consequently, the hydroperoxides are the only species determined by the method described in the literature. Consequently, the decomposition rate of ozonized polymers measured with this method is wrong. It may be an explanation due to the low activation energy and rapid decomposition rate always found by this method of assay. Using the selective deactivation of hydroperoxides we show that the hydroperoxides are the more numerous initiators in an ethylene vinyl acetate copolymer. They can initiate the polymerization of vinyl monomers. On the other hand, peroxides are in a minority and their decomposition simply carries away a slight degradation by chain scissions.

引用

页码：489 / 497

页数：9

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