Phosphonitrilic chloride: polymerization behaviour of some hexaalkoxycyclotriphosphazenes

Electron conductivity of hexaalkoxycyclotriphosphazenes N3P3(OR)6 is temperature dependent; the conductivity of the n-propoxy derivatives is dramatically raised at elevated temperature. Tan δ values of hexa-n-propoxy- and hexa-n-butoxy-cyclotriphosphazene increase appreciably at room temperature at high frequency. A chemical shift with 31P-n.m.r. spectra of hexa-n-propoxycyclotriphosphazene appears at the lowest field compared with other hexaalkoxycyclotriphosphazenes. Dipropyl ether or dibutyl ether, respectively, were detected when hexa-n-propoxy- or hexa-n-butoxy-cyclotriphosphazene were heated. It is assumed that a polymerization rather than a rearrangement reaction occurs on heating with the elimation of ethers.