Effect of water-bearing fiber in Kevlar 49-epoxy composites

Technical Report · Sat Dec 31 23:00:00 EST 1977

DOI:https://doi.org/10.2172/5211866· OSTI ID:5211866

Moss, M.

Water has been observed to be adsorbed, and possibly absorbed, by desiccated Kevlar 49 fiber to 6 percent of the fiber weight in 100 percent relative humidity. The effect of the water on the transverse flexural strength and elastic modulus of an aliphatic amine-cured epoxy, unidirectionally reinforced with saturated Kevlar 49, has been determined. Such composites are weaker than those made with fiber equilibrated to 0 percent relative humidity, and the effect persists after a 75/sup 0/C, 16-h postcure. It is suggested that glycol formation and a consequent excess of curing agent, resulting from a water-resin reaction at the fiber-matrix interface, accounts for the weakening.

• Research Organization: Sandia Labs., Albuquerque, N.Mex. (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 5211866
• Report Number(s): SAND-77-0444
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360303* -- Composite Materials-- Mechanical Properties-- (-1987)
ADSORPTION
ELASTICITY
EPOXIDES
FIBERS
FLEXURAL STRENGTH
HYDROGEN COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
REINFORCED MATERIALS
REINFORCED PLASTICS
SORPTION
TENSILE PROPERTIES
WATER