Improved Tough Adhesives for Structural Applications.
Final technical rept. 15 May 69-15 May 70,
SHELL DEVELOPMENT CO EMERYVILLE CA
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DEVELOPMENT OF ADHESIVES FOR METAL TO METAL AND METAL TO HONEYCOMB BONDING HAVING IMPROVED TOUGHNESS AT AMBIENT TEMPERATURE AND ELEVATED TEMPERATURE PERFORMANCE COMPARABLE TO PRESENTLY AVAILABLE HIGH TEMPERATURE ADHESIVE. The most promising results were obtained by using various combinations of selected epoxide resins and high temperature curing agents along with linear, tough, non-curing, high-melting polymers or elastomers. ADX-516, a blend of a high-melting polymer with high temperature epoxide resins and an aromatic amine curing agent, appears to meet most of the contract goals. Compared to reference high temperature adhesives, it has significantly improved toughness, as shown by climbing drum peel strengths at 75 degrees F and -67 degrees F and by a lower sensitivity in shear to strain application rate and LT overlap lengththickness changes. High temperature tensile shear properties 420 degrees F were good, and only small strength losses resulted from heat aging for 300 hours at 325 degrees F plus 10 hours at 420 degrees F. Strengths were still well above the contract goals. Other formulations containing various other polymers of this type were not successful in meeting the goals due to insufficient high temperature strength andor a lack of toughness. Several adhesive systems containing elastomers in cured high service temperature epoxides had strength and toughness properties roughly equal to the better reference adhesives studied. Author-PL
- Adhesives, Seals and Binders