Methylhydrosiloxane-dimethylsiloxane copolymer, hydride terminated
Methylhydrosiloxane-dimethylsiloxane copolymer, hydride terminated (CAS 69013-23-6), is a versatile reactive silicone fluid characterized by the presence of active silicon-hydrogen (Si-H) bonds both along the polymer backbone and at the chain ends. This specific molecular architecture combines the stability and flexibility of dimethylsiloxane units with the high reactivity of methylhydrosiloxane units. As a clear, low-to-medium viscosity liquid, it serves as a critical component in the synthesis and modification of advanced organosilicon materials.
The chemical functionality of this copolymer allows it to participate in hydrosilylation reactions, typically catalyzed by noble metals like platinum. Its hydride termination provides additional reactive sites compared to pendant-only variants, enhancing its ability to integrate into complex polymer networks. Due to the potential for hydrogen gas evolution upon contact with water, alcohols, or strong bases, handling requires careful moisture control and appropriate venting to ensure stability and safety during processing.
• This copolymer is primarily utilized as a crosslinking agent in addition-cure silicone elastomer systems. By reacting with vinyl-functional siloxanes, it facilitates the formation of a three-dimensional network, resulting in cured products with tailored mechanical properties, such as specific hardness and tensile strength, suitable for industrial moldings and gaskets.
• In the field of surface treatment and coatings, the material acts as a highly effective water-repellent agent. The Si-H groups can react with hydroxyl-functionalized surfaces or undergo controlled oxidation to form a durable, hydrophobic film. This makes it an ideal additive for treating textiles, masonry, and electronic components to enhance moisture resistance and dielectric stability.
• It serves as a vital intermediate in the production of functionalized silicones through the addition of organic molecules containing unsaturated bonds. This allows for the synthesis of specialty surfactants, lubricants, and softeners where specific organic groups are grafted onto the siloxane backbone, providing unique solubility or lubrication profiles.
• The hydride-terminated structure is frequently employed in research and development for creating block copolymers and sophisticated macromolecular architectures. Its dual-functionality—having reactive sites both internally and at the terminals—enables precise control over crosslink density and chain extension, which is essential for developing high-performance adhesives and encapsulants.
Product Name: Methylhydrosiloxane-dimethylsiloxane copolymer, hydride terminated
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