Study of the compression behavior of high performance fibers. Final report, 1 April 1991-30 November 1995
Compression behavior of pitch and PAN based carbon fibers and its dependence on structure and morphology has been studied. Structure development in PAN based fibers with heat treatment temperature has been followed using raman spectroscopy. Compressive strength of glassy resins has been studied. Crosslinking in the free annealed methyl pendant PBZT fibers have been verified using (13)C solid state NMR. Based on the axial compressive strength, torsional modulus, and transverse compressive strength measurements, it is concluded that crosslinking remains a viable approach for improving compressive strength in polymeric fibers. Torsional modulus as a function of temperature has been measured for various high performance fibers. Poly(benzobisthiazole)s containing an ortho-tetra substituted biphenyl moiety were synthesized via the polymerization of 2,5-diamino-1,4- benzenedithiol dihydrochloride with 2,2`-dinitro-6, 6`-dimethylbiphenyl-4,4` dicarboxylic acid. PBO and PBZT solubilization mechanism in nitromethane using aluminum chloride has been investigated using solution (27)Al NMR.
- Research Organization:
- Georgia Institute of Technology, Atlanta, GA (United States)
- OSTI ID:
- 270138
- Report Number(s):
- AD-A-305584/5/XAB; CNN: Contract AFOSR-91-0194; TRN: 61980356
- Resource Relation:
- Other Information: PBD: 31 Jan 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structure and properties of high-performance polymeric and carbon fibers - an overview
Synthesis and conductivity of aromatic benzobisthiazole copolymers with main-chain diphenylamino units