Accession Number : ADA305035

Title :   Moisture Diffusion Parameter Characteristics for Epoxy Composites and Neat Resins.

Descriptive Note : Technical paper,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Long, Edward R., Jr

PDF Url : ADA305035

Report Date : AUG 1979

Pagination or Media Count : 31

Abstract : The moisture absorption characteristics of two graphite/epoxy composites and their corresponding cured neat resins have been studied in high humidity and water immersion environments at elevated temperatures. Moisture absorption parameters - such as equilibrium moisture content and diffusion coefficient - derived from data taken on samples exposed to high humidity and water soak environments were compared. Composite swelling in a water immersion environment was measured. Tensile strengths of cured neat resin were measured as a function of their equilibrium moisture content after exposure to different moisture environments. The effects of intermittent moderate tensile loads on the moisture absorption parameters of composite and cured neat resin samples were determined.

Descriptors :   *GRAPHITE EPOXY COMPOSITES, TENSILE STRENGTH, HYDROGEN BONDS, HIGH TEMPERATURE, TENSILE STRESS, FIBER REINFORCED COMPOSITES, CARBON FIBERS, MATRIX MATERIALS, MOISTURE CONTENT, EPOXY LAMINATES, LIQUID IMMERSION TESTS, WATER ABSORPTION TESTS, DIFFUSION COEFFICIENT, CURING, EPOXY RESINS, CHEMICAL EQUILIBRIUM, HIGH HUMIDITY, ACTIVATION ENERGY.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE