Characterization of low thermal conductivity PAN-based carbon fibers. [PolyAcryloNitrile]

Technical Report · Sun Mar 01 04:00:00 EST 1992

OSTI ID:7305974

Katzman, H A; Adams, P M; Le, T D; Hemminger, C S

The microstructure and surface chemistry of eight low thermal conductivity (LTC) PAN-based carbon fibers were determined and compared with PAN-based fibers heat treated to higher temperatures. Based on wide-angle x ray diffraction, the LTC PAN fibers all appear to have a similar turbostratic structure with large 002 d-spacings, small crystallite sizes, and moderate preferred orientation. Limited small-angle x ray scattering (SAXS) results indicate that, with the exception of LTC fibers made by BASF, the LTC fibers do not have well developed pores. Transmission electron microscopy shows that the texture of the two LTC PAN-based fibers studied (Amoco T350/23X and /25X) consists of multiple sets of parallel, wavy, bent layers that interweave with each other forming a complex three dimensional network oriented randomly around the fiber axis. X ray photoelectron spectroscopy (XPS) analysis finds correlations between heat treated temperatures and the surface composition chemistry of the carbon fiber samples.

• Research Organization: Aerospace Corp., El Segundo, CA (United States)
• OSTI ID: 7305974
• Report Number(s): N-92-25345; NASA-CR--190312; NAS--1.26:190312; ATR--91(6819)-1; CNN: F04701-88-C-0089
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CARBON FIBERS
CHEMICAL COMPOSITION
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ESTERS
EVALUATION
FIBERS
HEAT TREATMENTS
MICROSCOPY
MICROSTRUCTURE
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PHOTOELECTRON SPECTROSCOPY
PHYSICAL PROPERTIES
POLYACRYLATES
POLYMERS
POLYVINYLS
POROSITY
SCATTERING
SMALL ANGLE SCATTERING
SPECTROSCOPY
SURFACE PROPERTIES
TEXTURE
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY