Phenyltrimethoxysilane blends

The thermal stability of several commercial silanes was studied by determining isothermal weight loss of the hydrolyzed silsequioxane form of the silanes (RSiOj ) at 300°C [11]. Fig. 25.5 shows that the phenylsilyl structure has very good thermal stability, but that the diaminosilane has poorer thermal stability. The vinylbenzylaminosilane has surprising good thermal stability. Phenyltrimethoxysilane blends or vinylbenzylaminosilane have been recommended for high-temperature applications. 

Silane coupling agents may contribute hydrophilic properties to the interface, especially when amino functional silanes, such as epoxies and urethane silanes, are used as primers for reactive polymers. The primer may supply much more amine functionality than can possibly react with the resin at the interphase. Those amines that could not react are hydrophilic and, therefore, responsible for the poor water resistance of bonds. An effective way to use hydrophilic silanes is to blend them with hydrophobic silanes such as phenyltrimethoxysilane. Mixed siloxane primers also have an improved thermal stability, which is typical for aromatic silicones [42]. 

Phenyl Phenyltrimethoxysilane Hydrophobing, dispersing aid for mineral surfaces, blends, hydrophobe, thermal stability... 

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