NASA Technical Reports Server (NTRS) : Fiber pdf

NASA Technical Reports Server (NTRS) : Fiber

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An ultra-high-molecular-weight polyethylene/ matrix interface based on the fabrication of a reactive nano-epoxy matrix with lower surface energy has been improved. Enhanced mechanical properties versus pure epoxy on a three-point bend test include: strength (25 percent), modulus (20 percent), and toughness (30 percent). Increased thermal properties include higher Tg (glass transition temperature) and stable CTE (coefficient of thermal expansion). Improved processability for manufacturing composites includes faster wetting rates on macro-fiber surfaces, lower viscosity, better resin infusion rates, and improved rheological properties. Improved interfacial adhesion properties with Spectra fibers by pullout tests include initial debonding force of 35 percent, a maximum pullout force of 25 percent, and energy to debond at 65 percent. Improved mechanical properties of Spectra fiber composites (tensile) aging resistance properties include hygrothermal effects. With this innovation, high-performance composites have been created, including carbon fibers/nano-epoxy, glass fibers/nano-epoxy, aramid fibers/ nano-epoxy, and ultra-high-molecularweight polyethylene fiber (UHMWPE

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 9/1/2011
• Year: 2011
• Book Topics/Themes: NASA Technical Reports Server (NTRS), EPOXY MATRIX COMPOSITES, FIBER COMPOSITES, CARBON FIBERS, AGING (MATERIALS), THERMAL EXPANSION, MECHANICAL PROPERTIES, MOLECULAR WEIGHT, EPOXY RESINS, GLASS TRANSITION TEMPERATURE, TOUGHNESS, SURFACE ENERGY, REACTIVITY, POLYETHYLENES, Zhong, Wei-Hong

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