العلاقة الرياضية لسرعة تحلل ولزوجة بولي فوسفات الامونيوم في وسط حامضي

MATHEMATICAL RELATION BETWEEN DEGRADATION RADATION RATE and VISCOSITY OF AMMONIUM POLYPHOSPHATE

Abstract: The research is conducted to establish a relationship between degradation rate and viscosity of Ammonium - polyphosphate at acid medium with pH ranged between 0.5 to 2.5 under temperatures of 293,313,333 and 353 k, the concentration of librated phosphorous is estimated by ascorbic acid method while the values of viscosity is measured by Ostwald’s method using viscometer .The rate constant of degradation is calculated as a function of time while the activation energy values were estimated Arrhenius equation The results showed that the degradation of ammonium - polyphosphate is a first - order reaction . The rate constants of reaction was increased dramatically with temperature while the viscosity values decreased with temperatures . However, the rate constant is highly affected by pH and decreased with decreasing of acidity . Meanwhile , the mathematical model was suggested to describe the relationship between the rate degradation and viscosity of Ammonium - polyphosphate .The modified empirical equation is :- TK=0.0028 η