Structure design of novel hyperbranched polycarbosilazanes: Synthesis and characterization

摘要

Three novel hyperbranched polycarbosilazanes were synthesized via hydrosilylation reaction characterized by FT-IR, H-1 NMR, C-13 NMR, Si-29 NMR, and laser light scattering. First, one AB(4) type monomer bis(N,N-diallylamino)-methylsilane (M1) and two AB(2) type monomers (N,N-diallylamino)-dimethylsilane (M2) and N,N-bis (dimethylsilyl)-allylamine (M) were prepared by aminolysis of MeHSiCl2 and Me2HSiCl with diallylamine and allylamine. Then monomers were polymerized into hyperbranched polycarbosilazanes via hydrosilylation reaction using H2PtCl6 as the catalyst. The measurements indicate that alpha-hydrosilylation mainly occurs during the polymerization and the polymers synthesized consist of equivalent to Si-N-C equivalent to linkages with hyperbranched architectures carrying a large amount of functional vinyl or equivalent to Si-H end groups. The molecular weights ((M) over bar (w),) of the three polymers were found to be 13 500, 4 600, and 3 900 g (.) mol(-1), respectively.