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Title: Study of insoluble crystals derived from solutions of Kevlar 49 in sulfuric acid

Abstract

The object of the study was to isolate and obtain x-ray diffraction analysis of the insoluble crystals which have been observed in Kevlar 49/H/sub 2/SO/sub 4/ dope. These insoluble crystals had previously been reported to be Kevlar single crystals after analysis by optical microscopy. A more detailed analysis does not support this conclusion. Additional optical microscopy coupled with FTIR and elemental analysis for C, H and N, has shown that these insoluble crystals are in fact terephthalic acid which is a decomposition product of the acid hydrolysis of Kevlar. A model compound study of sulfuric-acid hydrolysis of aromatic amide was carried out in order to better understand the sulfuric-acid-hydrolysis of Kevlar.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
6899451
Report Number(s):
UCID-20082
ON: DE84012226
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ARAMIDS; DECOMPOSITION; HYDROLYSIS; AMIDES; AROMATICS; CRYSTALLIZATION; CRYSTALS; OPTICAL MICROSCOPY; SULFURIC ACID; TEREPHTHALIC ACID; CARBOXYLIC ACIDS; CHEMICAL REACTIONS; DICARBOXYLIC ACIDS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; LYSIS; MATERIALS; MICROSCOPY; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PETROCHEMICALS; PETROLEUM PRODUCTS; PHASE TRANSFORMATIONS; PLASTICS; SOLVOLYSIS; SYNTHETIC MATERIALS 360400* -- Polymers & Plastics-- (-1987)

Citation Formats

Butler, N.L.. Study of insoluble crystals derived from solutions of Kevlar 49 in sulfuric acid. United States: N. p., 1984. Web.
Butler, N.L.. Study of insoluble crystals derived from solutions of Kevlar 49 in sulfuric acid. United States.
Butler, N.L.. 1984. "Study of insoluble crystals derived from solutions of Kevlar 49 in sulfuric acid". United States. doi:.
@article{osti_6899451,
title = {Study of insoluble crystals derived from solutions of Kevlar 49 in sulfuric acid},
author = {Butler, N.L.},
abstractNote = {The object of the study was to isolate and obtain x-ray diffraction analysis of the insoluble crystals which have been observed in Kevlar 49/H/sub 2/SO/sub 4/ dope. These insoluble crystals had previously been reported to be Kevlar single crystals after analysis by optical microscopy. A more detailed analysis does not support this conclusion. Additional optical microscopy coupled with FTIR and elemental analysis for C, H and N, has shown that these insoluble crystals are in fact terephthalic acid which is a decomposition product of the acid hydrolysis of Kevlar. A model compound study of sulfuric-acid hydrolysis of aromatic amide was carried out in order to better understand the sulfuric-acid-hydrolysis of Kevlar.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1984,
month = 5
}

Technical Report:
Other availability
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