Toughened moderate-temperature cure exoxy structural adhesives

Conference · Sun Mar 01 04:00:00 EST 1992

OSTI ID:5525579

LeMay, J D; Lyon, R E

Low-viscosity liquid precursor adhesives that can be cured at mederate temperatures and deliver high static strength and fracture toughness in bonded joints are of interest in a variety of structural joining applications at Lawrence Livermore. We have developed a toughened, structural epoxy adhesive that cures completely at 75{degrees}C and has a fracture toughness, K{sub Ic}(joint)=1.3 MPa{radical}m, in a 100{mu}m thick bondline. This adhesive is based on diglycidylether of bisphenol-A (DGEBA) epoxide resin in combination with an amidoamine hardener, and is toughened with an epoxide-functional liquid rubber. This adhesive was developed to join beryllium oxide components, but has proven to be a good general purpose structural adhesive for a variety of high surface energy substrates including metals, metal oxide ceramics, and glasses. The low surface tension of the liquid adhesive, {gamma}=31 dynes/cm, ensures that it also will wet and bond most low surface energy solids such as plastics and fiber reinforced polymer composites.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5525579
• Report Number(s): UCRL-JC-107317; CONF-9205146--1; ON: DE92011962
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360603* -- Materials-- Properties
ADHESIVES
ALKALINE EARTH METAL COMPOUNDS
BERYLLIUM COMPOUNDS
BERYLLIUM OXIDES
CHALCOGENIDES
CURING
EPOXIDES
FABRICATION
FRACTURE PROPERTIES
JOINING
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
RESINS