Organosilanes coupling agents

We have shown that chemical modification of metal oxide supports, such as silica (SiOz) and TiOz, with silane-coupling agents (organosilanes) having amino groups was effective for dispersion of a catalytic material such as phosphododecatungstate and... 

Organosilanes are the main group of coupling agents for glass fiber-reinforced polymers. They have been developed to couple virtually any polymer to the minerals that are used in reinforced composites f42J. 

In a fume hood, dissolve the organosilane coupling agent containing chloro-, amino-, or methoxysilane reactive groups in toluene, THF, or a hydrocarbon solvent at a concentration of 5 percent silane. 

Organosilane coupling agents have been widely used to improve the adhesion at the zeolite/polymer interface of the mixed-matrix membranes ]62, 63, 65, 70]. 

The surface modification can be done in water (contrary to organosilane coupling agents)... 

Fig. 5.3. Functions of a coupling agent (a) hydrolysis of organosilane to corresponding silanol (b) hydrogen bonding between hydroxyl groups of silanol and glass surface (c) polysiloxane bonded to glass surface (d) organofunctional R-group reacted with polymer. After Hull (1981).

While organosilane coupling agents are known to play an important role in interfacial adhesion in many composite systems, the mechanisms by which they improve product properties are not well understood. Sizes and surface treatments that use silanes are often developed entirely empirically as a consequence. The structure of the coupling agent, variables associated with silane deposition, and concentrations of a plethora of additives are adjusted in large matrix experiments, using end product properties as criteria for improved or diminished performance. 

Keywords Plasma polymer polymer-metal interface organosilane coupling agent corrosion resistance. 

The filler surface treatment can also be applied as an additive to the adhesive formulation. Coupling agents, such as organotitanates, zircoaluminates, or organosilanes, are added to the formulation so that they preferentially find their way to the filler s surface and provide for optimal surface chemistry and adhesion between the filler and the matrix resin. These coupling agents are discussed in Chap. 10. 

FIGURE 10.1 Organosilane coupling agents react with water in aqueous solutions to form hydrolyzed silanes that react with the surface of inorganic fillers or the adherend. The bound silane polymerizes, building up layers outward, with the organic functionality oriented to the resin matrix.3... 

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