SPIN LABELING AT OXIDATION SITES IN POLYMERS

被引：2

作者：

FAUCITANO, A ^{[1
]}

BUTTAFAVA, A ^{[1
]}

MARTINOTTI, F ^{[1
]}

GRECI, L ^{[1
]}

ADLER, G ^{[1
]}

机构：

[1] UNIV ANCONA,DIPARTIMENTO SCI MAT,I-60100 ANCONA,ITALY

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1992年 / 219卷

关键词：

SPIN LABEL; POLYPROPYLENE FILMS; ELECTRON SPIN RESONANCE; MOTIONAL ANISOTROPY; OXIDATION SITES; RADIATION; MOLECULAR DYNAMICS;

D O I：

10.1080/10587259208032124

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The selective spin labelling of polypropylene films for monitoring the molecular dynamics at the oxidation sites has been obtained by reacting 3-chloroformyl-2, 2, 5, 5-tetramethylpyrroline-1-oxyl with the OH groups formed in the photooxidation. The line shape changes of the ESR spectrum of the spin label, detected as a function of the temperature, have been interpreted in terms of a very anisotropic motion with fast rotation about a molecular axis oriented approximately along the N-0 bond; also evidence of the presence of two different populations of nitroxides with different mobilities has been obtained. The use of sulphonyl radicals as novel probes for molecular motion in polymers has also been tested. © 1992, Taylor & Francis Group, LLC. All rights reserved.

引用

页码：127 / 134

页数：8

共 11 条

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