ABSTRACT
Synthetic adhesives offer a number of potential advantages when compared to more traditional joining methods (fastening, riveting, soldering, brazing, and welding) including: more uniform distribution of stress and larger stress-bearing area than conventional mechanical fasteners; joining of any combination of similar or dissimilar materials; and
CONTENTS
4.1 Introduction .......................................................................................................................... 69 4.2 Fundamentals of Adhesion ................................................................................................ 70
4.2.1 Mechanical ................................................................................................................ 71 4.2.2 Adsorption and Wetting .........................................................................................72 4.2.3 Chemisorption ......................................................................................................... 73 4.2.4 Electrostatic ............................................................................................................... 73 4.2.5 Diffusion ................................................................................................................... 74 4.2.6 Weak Boundary Layer ............................................................................................. 74
4.3 High-Temperature Environments and Adhesives: It Might Not Just Be a Dry Heat ................................................................................................................ 74 4.4 High-Temperature Adhesives: Structures and Properties ............................................. 76
4.4.1 Epoxy and Epoxy Phenol Novolacs .......................................................................77 4.4.2 Polyimide .................................................................................................................. 78 4.4.3 Bismaleimide ............................................................................................................ 79 4.4.4 Polybenzimidazole ..................................................................................................80 4.4.5 Cyanate Esters .......................................................................................................... 81 4.4.6 Silicones ..................................................................................................................... 82
4.5 High-Temperature Bonding Applications ........................................................................84 4.6 Evaluating High-Temperature Adhesive Performance ..................................................85
