Synthesis and properties of polysiloxane containing N,N '-bis(diphenylsilyl)tetraphenylcyclodisilazane

A new kind of polysiloxane containing N,N ' -bis(diphenylsilyl)tetraphenyl- cyclodisilazane was prepared by the anionic polymerization with a "Seed sol ution" as initiator. The synthesis of monomers N,N ' -bis(hydroxydiphenylsi lyl)tetraphenylcyclodisilazane (BHPTPC), N,N ' -bis(chlorodiphenyisilyl)tet raphenylcyclodisilazane (BCPTPC), and 1,3-dichloro-1,1,3,3-tetraphenyldisil azane (DCTPS) are all reported in this study, The synthesized polysiloxane containing N,N ' -bis(diphenylsilyl)tetraphenylcyclodisilazane was characte rized by H-1-NMR, Si-29-NMR, gel permeation chromatography (GPC), and intri nsic viscosity. The thermal stability of the polysiloxane was studied by is othermal gravimetric analysis (IGA). The results demonstrated that the synt hesized polysiloxane containing N,N ' -bis(diphenylsilyl)tetraphenylcyclodi silazane had excellent thermal stability. (C) 2001 John Wiley & Sons, Inc.