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

Technical Report · Sun Jan 01 00:00:00 EST 1978

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 National Lab. (SNL-NM), Albuquerque, NM (United States)
• 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
REINFORCED PLASTICS
ELASTICITY
ADSORPTION
EPOXIDES
FIBERS
FLEXURAL STRENGTH
WATER
HYDROGEN COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
REINFORCED MATERIALS
SORPTION
TENSILE PROPERTIES
360303* - Composite Materials- Mechanical Properties- (-1987)