NEW POLYMER SYNTHESES .13. SYNTHESIS OF AROMATIC POLYPHOSPHATES FROM SILYLATED BISPHENOL-A OR TETRACHLOROHYDROQUINONE

Bulk condensations of bissilylated Bisphenol A and tetrachlorohydroquinone with various aryl phosphorodichloridates (phosphoric acid arylester dichlorides) were conducted at temperatures between 180 and about 300 degree C. Only when the pentachlorophenylester of phosphoric dichloride was condensed was partial crosslinking observed. Yields in the range of 80-95%, and M OVER BAR //n of approximately 12,000 were obtained. DSC measurements above 25 degree C show T//g in the range of 65-145 degree C, whereas melting endotherms were never found. Thermogravimetric analyses indicate that the thermal stability decreases with an increasing number of chlorines in the aryloxy group.