Syntheses and Structures of Cyclic and Short-Chain Linear Phosphazenes Bearing 4-Phenylphenoxy Side Groups

摘要

High polymeric phosphazenes form a class of inorganic/organic macromolecules thatpossess a wide rage of unusual properties. The type of side group attached to the polyphosphazene chain has a powerful effect on the physical and chemical characteristics. As part of our program to better understand the structure-property relationships in poly(organophosphazenes), we have synthesized a series of small-molecule cyclic and linear phosphazenes as structural models for the corresponding high polymers. The value of small-molecule phosphazene models for devising synthetic routes for the high polymers, and as tools to probe the possible structure of polymers, has been illustrated previously.