Accession Number:

ADA272059

Title:

Characterization of 1:1 Random Copolymers Obtained from 6-, 7-, 11-, and 12-Carbon Amino Acids.

Descriptive Note:

Technical rept.,

Corporate Author:

UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE

Personal Author(s):

Report Date:

1993-10-22

Pagination or Media Count:

4.0

Abstract:

15N-labelled N-substituted phthalimide derivatives were prepared from commercially available 15N-labelled potassium phthalimide and alkyl halides in dimethylformamide. The 15N CPMAS and CSA NMR spectra were recorded for a series of labelled imides as well as a polyimide derived from thianthrene dianhydride and 4,4-oxydinailine ODA. The 15N CPMAS results indicated that the 15N isotropic chemical shift is very sensitive to both hybridization. The 15N chemical shift anisotropy tensor elements Delta 11, Delta 22, and Delta 33 for three labeled derivatives were determined from CSA lineshape analysis using the program POWFIT developed by Dr. Terry Oas. In addition, the tensor orientation for 15N-13C labelled N-methylphthalimide was obtained. It was determined from the CSA data that delta 33 lies approximately along the N-C bond axis, with Delta 22 assumed to be approximately perpendicular to the imide plane. The angles alpha and beta were found to be 90.380 and 7.01 deg, respectively. The dipolar coupling constant for 13C-15N bond was 882.95 Hz, corresponding to a bond length of 1.51A.

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry
  • Polymer Chemistry
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE