Abstract
AbstractTetrachlorodiphenylcyclophosphazene trimer P3N3Cl4(C6H5)2 (TCP) was synthesized by Friedel‐Crafts reaction. Then, polycondensation reactions of TCP with aromatic dihydroxy compounds were carried out in pyridine as a solvent. The polycondensation products obtained from the reaction of TCP with aromatic dihydroxy compounds were soluble in the most polar solvents. The measured molecular weight was about 1,100 to 3,400. A difference in the molecular weights resulted from a different kind of used aromatic dihydroxy compounds. All polycondensation products were amorphous, white or yellow coloured solids. The polycondensation product obtained from TCP and p,p'‐dihydroxydiphenyl showed the highest softening point at about 260 to 267°C. Consequently, this product seemed to be the most stable against flame. Also it was found that the polycondensation products obtained from TCP and bisphenol‐A or p,p'‐dihydroxydiphenylsulfone had a three dimensional network structure as they had no softening point.
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