Molecular Control of Liquid Crystalline Orientation of Poly(p-phenylene- 2,6-benzobisoxazole) and Poly(p-phenylene-2,6-benzobisthiazole).

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Abstract:

We studied the effect of molecular orientation on the transverse mechanical properties of polyp-phenylene-2,6 benzobisoxazole PBO and poly2, 5-benzoxazole ABPBO. We prepared ABPBO and PBO chains with radially shaped chain orientations with respect to the anthrone nucleus. The inherent viscosity of the ABPBO in methene-sulfonic acid at 20 deg C was 0.98 dLg. The C-13 FT NMR spectrum of the star-like polymer showed a chemical shift at 75.0 ppm relative to TMS corresponding to the quaternary carbon in the 9-position of the anthrone ring.... Liquid crystalline, polybenzoxazoles.

Author(s):
Harruna, Issifu I. ; Polk, Malcom B. ; Khamvongsa, B. ; Thuo, A. ; Park, J.
Author Organization(s):
MORRIS BROWN COLL ATLANTA GA DEPT OF CHEMISTRY
Descriptive Note:
Technical rept.,
Pagination:
0004

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
N00014-91-J-1643
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6_Net Centric; JCA_6.3_Net Management; JCA_1.2_Force Preparation; JCA_1_Force Support
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*CONTROL, *LIQUIDS, *CRYSTALS, *BENZOXAZOLES, *MOLECULAR PROPERTIES, MECHANICAL PROPERTIES, CARBON, STARS, ACIDS, ANTHRONES, SULFONIC ACIDS, CHEMICAL SHIFTS, TRANSVERSE, NUCLEI, VISCOSITY, RINGS, CHAINS, ORIENTATION(DIRECTION), POLYMERS, CHEMICALS
Field(s)/Group(s):
Physical Chemistry, Polymer Chemistry, Crystallography, Atomic and Molecular Physics and Spectroscopy
Keyword(s):
*Poly(p phenylene 2 6 benzobisoxazole), *Poly(p phenylene 2 6 benzobisthiazole), Radial shapes, Methene
Report Date:
1992 Nov 30