Structural Gradient in the Silane Coupling Agent Layers and Its Influence on the Mechanical and Physical Properties of Composites

摘要

Studies of the structural gradient within the silane coupling agent interphase are reviewed. Origins of the structural variation in the silane layers are discussed in terms of the silane treating solution and variations in the substrates. The solution pH, concentration, solvent, hydrolysis time and aging time are some of the important parameters identified. Consideration is given to the following categories; the first monolayer on the substrate, the tightly chemisorbed layers near the substrate, the loosely chemisorbed layers in the middle and finally the physisorbed silanes in the outermost layers. The role of these regions in terms of the reinforcement mechanism of composites and the rheology of polymer melts is discussed. Complex formation of silanes with metallic substrates is briefly mentioned. (Author)