Text: SILANE-MODIFIED POLYMERS Polymeric Coupling Agents Polymeric silanes are preferred in film-forming and primer applications. Multiple bonding opportunities with both inorganic substrates and polymer matrices make these materials desirable in many adhesive bonding formulations. Polymeric coupling agents introduce new considerations when used as additives in composite systems. In general, hydrophilic polymeric silanes are more effective on hydrated substrates such as aluminum trihydrate, a wetting phenomenon, but care must be taken to maintain reactivity with the organic substrate. It has been demonstrated that when polymeric silanes are used in composites,dialkoxy versions generally give higher mechnical properties than trialkoxy-silanes. Vinyl and other unsaturated polymeric silanes can be grafted to polyolefins with peroxides. Those with alkoxygroups can be subsequently crosslinked with moisture. The technology is important in enhancing wet electricals and use temperature ranges for the wire and cable industry. Alkoxy-silane modified polymers are used to transfer the properties of a polymer to inorganic material by displacing alkoxy groups on the silicon. The materials have uses as permanently bonded stationary phases for chromatography and exchange columns. Other polymers with non-reactive silane pendant groups have been used for permeable membranes and as barriers.

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