ON THE THEORY OF THE EFFECTIVE NUCLEAR MAGNETIC-RELAXATION TIME T2E AND ITS APPLICATION TO POLYMER MELTS

被引：8
|
作者：
SCHNEIDER, H
HILLER, W
机构：
[1] Technische Hochschule "Carl Schorlemmer" Leuna-Merseburg, Merseburg
[2] Zentralinstitut für Organische Chemie, Akademie der Wissenschaften der DDR, Berlin
来源：
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 1990年 / 28卷 / 07期
关键词：
D O I：
10.1002/polb.1990.090280702
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 general expression for the magnetization decay of a multipulse group is derived. This formula is applied to a three‐component model of molecular motions in polymer melts. The influence of the several components on the magnetization decay is discussed. The relation of the effective nuclear magnetic relaxation time T2e to the Anderson‐Weiss formula is also shown, and an analytical expression for the transverse relaxation in melts is derived. Finally T2e is compared with the relaxation time in the rotating frame T1ρ in the melt. The theoretical results for T2e are tested with measurements of frequency dependence in polyethylene melts. Copyright © 1990 John Wiley & Sons, Inc.
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页码：1001 / 1014
页数：14
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