THERMAL BEHAVIOR OF LEAD CYCLO-TRIPHOSPHATE

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Lead cyclo-triphosphate (P₃m) was synthesized and its thermal behavior was investigated by DTA-TG, XRD, and HPLC-FIA. It hydrolyzed to various short-chain lead phosphates at about 200°C, and they condensed to long-chain lead polyphosphate through lead cyclo-tetraphosphate (P₄m) and cyclo-octaphosphate (P₈m), or directly condensed to long-chain lead polyphosphate.
For the purpose of increasing the yield of P₈m, the thermal change of P₃m at various heating rates was investigated. P₈m was obtained in a 90% yield at heating rate of 3°C/min, while its yield at 20°C/min was about 30%.