Does the reaction of a KiON polysilazane with an isocyanate or epoxy group generate a lot of heat?
KiON polysilazanes are EXTREMELY reactive at room temperature toward aromatic isocyanates (e.g. TDI, MDI). The reaction is exothermic and a significant amount of heat is evolved.. For this reason, it is important to EXERCISE EXTREME CAUTION when reacting KiON polymers with aromatic isocyanates. Cross sections of no more than about 0.5 inches should be attempted in unfilled compositions. Particulate fillers such as silicon carbide and aluminum metal can be used to ameliorate this exotherm. The reaction of KiON polysilazanes with other organic moieties is much less exothermic, and often some heating is required to effect full cure.
