Accession Number : ADA305584

Title :   Study of the Compression Behavior of High Performance Fibers.

Descriptive Note : Final rept. 1 Apr 91-30 Nov 95,

Corporate Author : GEORGIA TECH RESEARCH CORP ATLANTA

Personal Author(s) : Kumar, Satish ; Polk, Malcolm B.

PDF Url : ADA305584

Report Date : 31 JAN 1996

Pagination or Media Count : 22

Abstract : 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. jg 1

Descriptors :   *COMPRESSION, *FIBERS, *PERFORMANCE(ENGINEERING), *CARBON FIBERS, MEASUREMENT, TEMPERATURE, ANNEALING, ALUMINUM COMPOUNDS, ZIRCONIUM COMPOUNDS, NUCLEAR MAGNETIC RESONANCE, METHYL RADICALS, POLYMERS, RAMAN SPECTROSCOPY, ACRYLONITRILE POLYMERS, GLASS, HEAT TREATMENT, CROSSLINKING(CHEMISTRY), LEAD TITANATES, CHLORIDES, COMPRESSIVE STRENGTH, PLASTICS, TORSION, SOLID STATE ELECTRONICS, CARBOXYLIC ACIDS, NITROMETHANE, TRANSVERSE, AXIAL FLOW, PITCH(MATERIAL), BIPHENYL.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Physical Chemistry
      Coatings, Colorants and Finishes
      Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE