DETERMINATION OF CROSS-LINK DENSITY IN THERMOSET POLYMERS BY USE OF SOLID-STATE H-1-NMR TECHNIQUES

被引：74

作者：

FRY, CG ^{[1
]}

LIND, AC ^{[1
]}

机构：

[1] MCDONNELL DOUGLAS CORP,MCDONNELL DOUGLAS RES LABS,ST LOUIS,MO 63166

来源：

MACROMOLECULES | 1988年 / 21卷 / 05期

关键词：

EPOXY RESINS - NUCLEAR MAGNETIC RESONANCE - PLASTICS - Curing - THERMOSETS - Mechanical Properties;

D O I：

10.1021/ma00183a019

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Solid-state **1H NMR techniques were used to determine the cross-link density of highly cross-linked polymers common in the aerospace industry. As the temperature was increased, the spin-spin relaxation times of cross-linked epoxy polymers were observed to reach a plateau value which increased linearly with increasing molecular weight between cross-links, as predicted by theory. The results show that, for the epoxy system studied, approximately 10 rotatable backbone bonds are needed to form a statistical segment, the portion of the polymer backbone that moves independently of the other backbone motions.

引用

页码：1292 / 1297

页数：6

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