Diluted epoxy adhesives. I. Physical properties and lap shear strengths

✍ Scribed by Thomas J. Dearlove

• Publisher: John Wiley and Sons
• Year: 1978
• Tongue: English
• Weight: 632 KB
• Volume: 22
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1978.070220910

✦ Synopsis

A series of epoxy adhesives were prepared from a commercial bisphenol A-epichlorohydrin epoxy resin by diluting it with varying amounts of either phenyl glycidyl ether or 1,4-butanediol diglycidyl ether and curing with either diethylenetriamine (DTA) or diethylaminopropylamine (DPA). The initial physical properties (density, viscosity, and surface tension) of the epoxy solutions were determined both with and without curing agents. It was found that the surface tensions of adhesives catalyzed with DPA are initially very low (31-32 dynedcm), and within several hours these solutions attain an equilibrium surface tension of 40-46 dynes/cm. When the steel-to-steel lap shear strengths of these adhesives were measured, a correlation was not observed between the initial properties and the strengths of these materials.