Development and application of latent hydrosilylation catalysts [2]—Control of catalytic activity of platinum catalyst by polystyrene derivatives having propargyl moieties

A new thermal latent hydrosilylation catalyst on the basis of H₂PtCl₆ and polystyrene derivatives having propargyl moieties is described. The polystyrene derivatives having various propargyl moieties were obtained by the reaction of propargyl alcohols with poly(p‐chloromethylstyrene) or its copolymer with styrene. The polymer‐supported platinum catalysts were prepared by aging H₂PtCl₆ with these polymers in tetrahydrofuran at 30 °C for 12 h. In the presence of the polymers, the hydrosilylation activity of H₂PtCl₆ was found to be controlled thermally in the model reaction of trimethylsilane and triethylvinylsilane. Effective control of the crosslinking reaction of silicone resin was also achieved by using these latent catalyst systems. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 35–42, 2000