Abstract
A polymer having propargyl moieties was prepared by the reaction of commercial phenol resin with propargyl bromide and the possibility of control in the activity of the hydrosilylation catalyst was evaluated by a model reaction. In the presence of the polymer, a model hydrosilylation reaction of triethylsilane with trimethylvinylsilane was found to be inhibited effectively at an ambient temperature, while the activity of the catalyst sufficiently revealed on heating. Compared with other polymeric propargyl systems that the authors have examined, the phenol resin system was found to show a higher retardation effect. Besides polymer structure, the concentration of the added polymer affected catalytic activity. The crosslinking process of the silicone resin was also controlled effectively by the present latent system.
