Silane Coupling Agents

\* It has been rumored that a bumble bee has such aerodynamic deficiencies that it should be incapable of flight. Fiberglass-reinforced polymer com­ posites, similarly, have two (apparently) insurmountable obstacles to per­ formance: 1) Water can hydrolyze any conceivable bond between organic and inorganic phase, and 2) Stresses across the interface during temperature cycling (resulting from a mismatch in thermal expansion coefficients) may exceed the strength of one of the phases. Organofunctional silanes are hybrid organic-inorganic compounds that are used as coupling agents across the organic-inorganic interface to help overcome these two obstacles to composite performance. One of their functions is to use the hydrolytic action of water under equilibrium condi­ tions to relieve thermally induced stresses across the interface. If equilib­ rium conditions can be maintained, the two problems act to cancel each other out. Coupling agents are defined primarily as materials that improve the practical adhesive bond of polymer to mineral. This may involve an increase in true adhesion, but it may also involve improved wetting, rheology, and other handling properties. The coupling agent may also modify the inter­ phase region to strengthen the organic and inorganic boundary layers. Front Matter....Pages i-ix General Concepts....Pages 1-28 Chemistry of Silane Coupling Agents....Pages 29-47 Aqueous Solutions of Silane Coupling Agents....Pages 49-73 Surface Chemistry of Silanes at the Interface....Pages 75-109 Nature of Adhesion through Silane Coupling Agents....Pages 111-139 Performance of Silane Coupling Agents....Pages 141-165 Particulate-Filled Composites....Pages 167-205 Other Applications of Silane Coupling Agents....Pages 207-232 Back Matter....Pages 233-235