Vinyltrimethoxysilane CAS No. 2768-02-7, also known as VTM, is an organically modified silane that functions as both a silane coupling agent and a condensation catalyst. It contains vinyl and methoxy groups attached to a silicon core, giving it unique properties and reactivity.
VTM is commonly used in resin modification applications where it reacts with hydroxyl groups on other compounds. The vinyl groups on VTM can then copolymerize with other vinyl compounds, crosslinking the resin matrix. This improves adherence, tensile strength, and high temperature and chemical resistance of the final material.
Some main applications of vinyltrimethoxysilane include:
- Fiber reinforced composites: VTM can enhance the bonding between fibers and resin matrices in composites for applications like automotive and aerospace parts.
- Coating systems: It reacts into coatings based on epoxies, acrylics, and polyurethanes, improving their adhesion to substrates.
- Adhesives: VTM modifies the chemistry of adhesives like epoxy and acrylic, improving bonding performance.
- Encapsulants and potting compounds: It crosslinks polymers used for protecting electrical components.
When in solution, the methoxy groups on VTM’s silicon core undergo hydrolysis reactions with water, releasing methanol and generating reactive silanol groups. The silanols then undergo condensation reactions with hydroxyl groups on other compounds, chemically bonding VTM into the material. The vinyl groups remain available for polymerization reactions that strengthen and crosslink the matrix.
In summary, vinyltrimethoxysilane is an effective organosilane additive for modifying, strengthening and enhancing the properties of resins, composites and coatings. Its vinyl and methoxy reactive groups give it versatile functionality, making it useful for a range of modification applications.