Solid-State 15N NMR of 15N-Labeled Nylon 6 and Nylon 11
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 22, 1990
- Accession Number
- ADA223271
Entities
People
- Douglas G. Powell
- Jean-philippe Autran
- Lon J. Mathias
- Roger S. Porter
Organizations
- University of Southern Mississippi