Structure Design of Novel Hyperbranched Polycarbosilazanes: Synthesis and Characterization

Abstract

AbstractThree novel hyperbranched polycarbosilazanes were synthesized via hydrosilylation reaction and characterized by FT‐IR, 1H NMR, 13C NMR, 29Si NMR, and laser light scattering. First, one AB4 type monomer bis(N,N‐diallylamino)‐methylsilane (M1) and two AB2 type monomers (N,N‐diallylamino)‐dimethylsilane (M2) and N,N‐bis (dimethylsilyl)‐allylamine (M3) 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 α‐hydrosilylation mainly occurs during the polymerization and the polymers synthesized consist of SiNC linkages with hyperbranched architectures carrying a large amount of functional vinyl or SiH end groups. The molecular weights ($\overline M _{\rm w} $) of the three polymers were found to be 13 500, 4 600, and 3 900 g · mol−1, respectively.magnified image