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Title: Hydrolytic degradation of Kevlar 49 fibers

The hydrolytic degradation of Kevlar 49 fibers and the principal parameters that control this degradation are presented. Hydrolytic chain scission of the amide linkage and corresponding fiber strength deterioration are considered in terms of RH, time, temperature and stress level. The rates of hydrolytic degradation at 100% RH in the 100 to 200/sup 0/C range are reported. The estimated rates of fiber degradation in various service environment conditions are also reported and shown not to be serious. The impurities present in Kevlar 49 fibers and their effect on hydrolytic degradation are also discussed. In addition, the aging of Kevlar 49 fibers as a result of exposure to uv and stress are reviewed.
Authors:
; ; ; ; ;
Publication Date:
OSTI Identifier:
5277278
Report Number(s):
UCRL-89625; CONF-840459-2
ON: DE84004158
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 29. national SAMPE symposium, Reno, NV, USA, 3 Apr 1984
Research Org:
Lawrence Livermore National Lab., CA (USA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ARAMIDS; FAILURES; HYDROLYSIS; FIBERS; HUMIDITY; STRESSES; ULTRAVIOLET RADIATION; CHEMICAL REACTIONS; DECOMPOSITION; ELECTROMAGNETIC RADIATION; LYSIS; MATERIALS; PETROCHEMICALS; PETROLEUM PRODUCTS; PLASTICS; RADIATIONS; SOLVOLYSIS; SYNTHETIC MATERIALS 360405* -- Materials-- Polymers & Plastics-- Degradation & Erosion-- (-1987)