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

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:
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
Research Org:
Lawrence Livermore National Lab., CA (USA)
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)