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

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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.

Author(s):
Johnson, C. G. ; Mathias, L. J.
Author Organization(s):
UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE
Descriptive Note:
Technical rept.,
Supplementary Note:
Pub. in Polymer Preprints, v34 n2 p348-349 Aug 93.
Annotation:
Reprint: Characterization of 1:1 Random Copolymers Obtained from 6- , 7-, 11-, and 12-Carbon Amino Acids
Pagination:
0004

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-64
Contract/Grant Number(s):
N00014-89-J-1225
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6_Net Centric; JCA_6.3.1_Optimized Network Functions and Resources; JCA_6.3_Net Management; JCA_1.2_Force Preparation; JCA_1_Force Support
Modernization Areas:
Directed Energy
Communities of Interest:
Air Platforms
Descriptor(s):
*NUCLEAR MAGNETIC RESONANCE, *CARBON, *NITROGEN, *SOLID STATE PHYSICS, *TENSORS, ANGLES, MODELS, SYNTHESIS, CHEMICAL BONDS, LENGTH, CONSTANTS, HYBRIDIZATION, CHEMICAL SHIFTS, COUPLINGS, ALKYL RADICALS, IMIDES, LABELED SUBSTANCES, POTASSIUM, HALIDES, ISOTOPES, FORMAMIDES, ANISOTROPY, SPECTRA, POLYMERS, ANHYDRIDES, CHEMICALS, METHYL RADICALS, REPRINTS
Field(s)/Group(s):
Organic Chemistry, Physical Chemistry, Polymer Chemistry, Atomic and Molecular Physics and Spectroscopy
Keyword(s):
*N METHYLPHTHALIMIDE, *POLYIMIDES, THIANTHRENE DIANHYDRIDE, ODA(OXYDIANILINE), POWFIT COMPUTER PROGRAM, DIPOLAR COUPLINGS
Report Date:
1993 Oct 22