Synthesis and characterization of a new polysiloxane containing N,N '-bis(diphenylsilyl)tetraphenylcyclodisilazane

A new kind of polysiloxane containing N,N'-bis(diphenylsilyl)tetraphenylcyc lodisilazane was prepared by anionic non-equilibrium polymerization with a "seed solution'' as initiator. The monomer, N,N'-bis(hydroxydiphenylsilyl)- tetraphenyl-cyclodisilazane (BHPTPC), was synthesized via the hydrolysis of N,N'-bis(chlorodiphenylsilyl)tetraphenyl- cyclodisilazane (BCPTPC). A new method for the preparation of BCPTPC is also reported here with high yield and simpler manipulation. The synthesized polysiloxane containing N,N'-bis( diphenylsilyl)tetraphenylcyclodisilazane was characterized by H-1-NMR, Si-2 9-NMR, gel permeation chromatography (GPC) and intrinsic viscosity.