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Accession Number:
ADA223271
Title:
Solid-State 15N NMR of 15N-Labeled Nylon 6 and Nylon 11
Descriptive Note:
Technical rept. 1 Jun 1989-31 May 1990,
Corporate Author:
UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE
Report Date:
1990-05-22
Pagination or Media Count:
40.0
Abstract:
The solid state Nitrogen-15 nuclear magnetic resonance characterization of nylon 6 and nylon 11 is summarized and compared. The two compounds of the non-crystalline peak are thought to belong to a liquid-like amorphous region and a more rigid interphase region lying between the crystalline and amorphous regions. The chemical shift anistropy CSA spectra of static samples were also obtained. Motion in the amorphous region was monitored by observing an isotropic peak at elevated temperatures. At temperatures above 100 deg for nylon 6, the most deshielded component was lost from the CSA spectrum suggesting a previously unreported motion occurring in the rigid crystalline region involving libration of the intermolecular hydrogen bond. For nylon 11, the alpha-crystal form transformed above 95 deg C to the pseudohexagonal delta-crystal form, although the CSA spectra showed that the hydrogen bonded amide units remained conformationally rigid despite increasing librational motion. jg
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
