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On the theory of the effective nuclear magnetic relaxation time T2e and its application to polymer melts

✍ Scribed by H. Schneider; W. Hiller

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
537 KB
Volume
28
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

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 T~2e~ to the Anderson‐Weiss formula is also shown, and an analytical expression for the transverse relaxation in melts is derived. Finally T~2e~ is compared with the relaxation time in the rotating frame T~1ρ~ in the melt. The theoretical results for T~2e~ are tested with measurements of frequency dependence in polyethylene melts.

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