粘合剂在结构应用中的使用越来越多，尤其是作为机械紧固件的替代品。传统上，环氧树脂是首选粘合剂。然而，聚氨酯粘合剂由于其特性——柔韧性、低温性能、对许多基材的附着力等——正在越来越多的应用中使用。在这项研究中，进行了广泛的行业调查，以确定用于汽车和航空航天行业常用粘接材料的高性能、双组分、结构聚氨酯粘合剂系统。随后，使用铝、钢、聚酯-玻璃纤维、石墨-环氧树脂和石墨-聚醚醚酮作为粘合剂，对所选粘合剂系统的性能进行评估。

ADHESIVES ARE FINDING INCREASED USE IN STRUCTURAL APPLICATION, PARTICULARLY AS REPLACEMENTS FOR MECHANICAL FASTENERS. EPOXIES HAVE TRADITIONALLY BEEN THE ADHESIVE OF CHOICE. HOWEVER, POLYURETHANE ADHESIVES, BECAUSE OF THEIR PROPERTIES--FLEXIBILITY, LOW-TEMPERATURE PERFORMANCE, ADHESION TO MANY SUBSTRATES, ETC.--ARE BEING USED IN AN INCREASING NUMBER OF APPLICATIONS. IN THIS STUDY, AN EXTENSIVE INDUSTRY SURVEY WAS PERFORMED TO IDENTIFY HIGH-PERFORMANCE, TWO-COMPONENT, STRUCTURAL POLYURETHANE ADHESIVE SYSTEMS FOR BONDING MATERIALS COMMONLY USED IN THE AUTOMOTIVE AND AEROSPACE INDUSTRIES. SUBSEQUENTLY, THE PERFORMANCE OF SELECTED ADHESIVE SYSTEMS WAS EVALUATED USING ALUMINUM, STEEL, POLYESTER-FIBERGLASS, GRAPHITE-EPOXY, AND GRAPHITE-PEEK AS THE ADHERENTS.