Monohydrazinium phosphate

Hydrazine Phosphates - Monohydrazinium Phosphate (N2H5H2PO4) and Dihydrazinium Phosphate [(N2H5)2HP04]... 

Table 2.8 gives the TG and DTA results for monohydrazinium phosphate (N2H5H2PO4) and dihydrazinium phosphate, (N2H5)2HP04, along with the associated products formed. 

Monohydrazinium phosphate (MHP) and dihydrazinium phosphate (DHP) have also been investigated as flame retardants of cellulose and compared with the corresponding ammonium phosphates [6,7]. The flame retardant property of hydrazinium phosphates is checked using a Whatman No. 40 filter paper with an ash content of 0.018% as the cellulose source. This filter paper is treated with hydrazinium phosphates by dipping it into aqueous solutions of selected concentrations of 2.5% and 10% to ensure that the desired weight of phosphate is retained on the sample. The samples are then dried in air and used in pyrolysis experiments. 

Figure 6.3 shows the DTA curves of cellulose, monohydrazinium phosphate-treated cellulose, and dihydrazinium phosphate-treated cellulose. The DTA of cellulose exhibits a large exotherm at 377°C due to the oxidative degradation of cellulose and the oxidation of tarry products produced from the pyrolysis of cellulose. The first exothermic peak temperature is lowered from 377°C for pure cellulose to 277°C for... 

Table 6.2 DTA data of untreated and monohydrazinium phosphate-treated Whatman filter paper.

Table 6.2 summarizes the DTA data of untreated cellulose and of cellulose treated with various concentrations of monohydrazinium phosphate. 

The ratio of the intensity of mass 18 to 44 (water and carbon dioxide, respectively) is higher for dihydrazinium phosphate-treated cellulose than for monohydrazinium phosphate-treated cellulose or even diammonium... 

Patil, K.C., Vittal, J.J., and Patel, C.C. (1980) Monohydrazinium phosphate as flame retardant. Journal Fire Retardant Chemistry, 7, 3-8. 

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