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Factors Affecting the Processing of Epoxy Film AdhesivesThe increasing awareness that adhesive performance is controlled not only by the condition of the adherend surface but also the condition or state of the adhesive and the process parameters used during fabrication is expected to result in improved reliability, as well as bond performance. The critical process variables which have been found to control adhesive bond formation and ultimate bond strength in 250F and 350F curing epoxy adhesives are described in terms of fabrication parameters and adhesive characteristics. These include the heat-up rate and cure temperature during processing and the adhesive moisture content and age condition (degree of advancement). The diagnostic methods used to delineate the effects of these process variables on adhesive performance are illustrated. These are dielectric, thermomechanical (TMA) and dynamic mechanical (DMA) analyses. Correlation of test results with measured mechanical tensile lap shear strengths of bonded joints is presented and the results briefly discussed in terms of the additives and hardeners used in the adhesive systems.
Document ID
19860001785
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Pike, R. A.
(United Technologies Research Center East Hartford, CT, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1985
Publication Information
Publication: NASA. Langley Research Center Welding, Bonding and Fastening, 1984
Subject Category
Nonmetallic Materials
Accession Number
86N11252
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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