Impurities in Kevlar 49 fibers
The impurities in Kevlar 49 fibers (poly(p-phenylene terephthalamide)PPTA) are reported and discussed in terms of the fiber fabrication processes. These impurities were monitored by inductively coupled plasma emission and optical emission spectroscopy. The principal impurities Na/sub 2/SO/sub 4/ and total S were analyzed chemically. From these chemical analyses together with C, N, H elemental analyses we show that there are 1.5 wt % impurities present in Kevlar 49 fibers of which approx. 50% are in the form of Na/sub 2/SO/sub 4/ and the remainder probably in the form of benzene sulfonic -SO/sub 3/H PPTA side groups. There are 3 of these acid groups per each PPTA macromolecule. Organic impurities, such as terephthalic acid are discussed in the light of degradation studies of PPTA-H/sub 2/SO/sub 4/ spinning dopes. Electron microprobe x-ray spectroscopy and laser-induced damage studies were utilized to investigate the distribution of impurities through the fiber cross-section. The distribution of impurities throughout the fiber are determined by the fiber fabrication processes and are discussed at the microscopic and molecular level. The defects caused by these impurities and their effect on the deformation and failure modes are also considered. 22 references, 3 tables.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5994840
- Report Number(s):
- UCRL-90947; CONF-850323-2; ON: DE85004996
- Resource Relation:
- Conference: 30. national meeting of the Society for the Advancement of Material and Process Engineering, Anaheim, CA, USA, 19 Mar 1985; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARAMIDS
CHEMICAL COMPOSITION
FABRICATION
IMPURITIES
ASHES
MONITORING
SODIUM SULFATES
SULFONIC ACIDS
SULFUR
DAMAGE
DEFECTS
ELECTRON MICROPROBE ANALYSIS
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
LASER RADIATION
PLASMA
TEREPHTHALIC ACID
X-RAY SPECTROSCOPY
ALKALI METAL COMPOUNDS
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
DATA
DICARBOXYLIC ACIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
INFORMATION
MATERIALS
MICROANALYSIS
NONMETALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
RADIATIONS
RESIDUES
SODIUM COMPOUNDS
SPECTROSCOPY
SULFATES
SULFUR COMPOUNDS
SYNTHETIC MATERIALS
360401* - Polymers & Plastics- Preparation & Fabrication- (-1987)
360402 - Polymers & Plastics- Structure & Phase Studies- (-1987)