Accession Number:

ADA281739

Title:

Interface Mobility and Its Effect on Interlaminar Fracture Toughness in Glass Fiber Reinforced Epoxy Laminates

Descriptive Note:

Technical rept. 1 Jan 1993-9 Jul 1994

Corporate Author:

MISSOURI UNIV-ROLLA DEPT OF CHEMISTRY

Personal Author(s):

• Wang, Timothy W.
• Blum, Frank D.

Report Date:

1994-07-09

Pagination or Media Count:

9.0

Abstract:

The relationship between the interface of glass fabricresin and the resultant composite Mode I delamination fracture toughness in a glass fabric laminate was investigated using a double cantilever beam DCB specimen. The treatment of glass with silane coupling agents has been shown to improve the mechanical properties of the composite as a function of the type of coupling agent used. Two silane coupling agents, gamma-aminopropyltriethoxysilane APS and gamma-aminobutyltriethoxysilane ABS were used. These have similar chemistry, but differ in Either coupling agent improved the interfacial properties. The critical energy release rate Gu sub, of APS treated composites was higher than that of ABS treated composites. Thus we conclude that bulk structural properties are a function of the microscopic interfacial properties, including the dynamics of the coupling agent layer.

Descriptors:

• *INTERFACES
• *COMPOSITE MATERIALS
• *FIBER REINFORCED COMPOSITES
• *TOUGHNESS
• *FRACTURE(MECHANICS)
• *GLASS FIBERS
• *SILANES
• *EPOXY LAMINATES
• *BUTYL RADICALS
• *PROPYL RADICALS
• *LAMINATED GLASS
• MECHANICAL PROPERTIES
• MOBILITY
• LAYERS
• POLYMERS
• ENERGY
• RATES
• FABRICS
• ORGANIC COMPOUNDS
• RELEASE
• PLASTICS
• MOLECULAR PROPERTIES
• DELAMINATION
• COUPLINGS
• CANTILEVER BEAMS

Subject Categories:

• Organic Chemistry
• Polymer Chemistry
• Laminates and Composite Materials
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE