Abstract：Polyhydrosiloxane is an important chemical intermediate applied on synthesis of many kinds of modified silicone oil. To facilitate the study of polysiloxane hydrosilylation and their property-structure relationships, there is a need to know the microstructure of polyhydrosiloxane. Polyhydrosiloxane were synthesized via telomerization and a parameter dispersion degree (η) was defined to characterize the microscopic structure of polymer sequence by modifying the formula of polymer sequence length in this study. The reactions were carried out under conditions of different catalyst loading, temperature and agitation speed to investigate their effects on dispersion degree and proportions of polymer. The results show that the process consists of polymerization-equilibrium and -Si(CH3)H-O- (DH) link distribution-equilibrium and the former shows a faster rate. At 65 ℃, the polymerization reaches equilibrium within 2-3 h while 8 h or even longer is required for the DH distribution equilibrium. The two equilibriums are favored with the increase of the catalyst loading, temperature and agitation speed. The dispersion degree can be as high as 0.805 with the catalyst loading being 5%, temperature 65 ℃, and agitation speed 400 r/min.
