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Crosslinking with Dynasylan®
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Dynasylan® products have long been used to endcap polymers such as silicones, polyethers, and polyurethanes to tailor modulus, tensile strength, and elongation. In addition to endcapping a polymer, silanes can be incorporated in the polymer chain by free radical polymerization or by reaction with active groups on the polymer chain. Crosslinking occurs in the presence of ambient moisture and the rate can be varied by adjusting the pH of the system.
- The resulting siloxane (Si-O-Si) crosslink is very strong, imparting mechanical, chemical, and weather resistance to the polymer.
- The type of silane chosen has an effect on the degree of crosslinking. The graph below shows the effect of several Dynasylan® aminofunctional silanes on the modulus (a physical property related to the degree of crosslinking) of a polyurethane sealant.
Silane crossling reaction
Effects of Dynasylan® aminofunctional silane adhesion promoters on the modulus of a polyurethane sealant
Evonik is partnering with SpecialChem to present their Dynasylan® organofunctional silanes technology and its latest advancements to the Adhesives and Sealants industry and the related experts community at
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