Maleke ashtar University of Technology, Esfahan, Iran (Received: 10/5/2015, Accepted: 1/26/2015)

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1 ج ه ع ی - و ی " واد RاRژی" سال یازد م ماره ١ ماره ی ٢٩ هار ٩۵ :ص ١۶-١١ ( 9/11/ : 9/7 /13 : ) (DTA).. HMX %95 %5. OFW. 33/±/ 1/1±5/ =0/1-0/9. [-ln(1-a)] 1/3 A3 13/5-15/ log A -1 3(1-a)[-ln(1-a)] /3.. : Kinetic Study on Triplet of Thermal Decomposition Reaction of Ocfol Explosive by Non-Isothermal Differential Thermal Analysis Method H. R. Pouretedal, S. Damiri, H. Sinapour, A. Malekzadeh 1 Maleke ashtar University of Technology, Esfahan, Iran (Received: 10/5/015, Accepted: 1//015) Abstract The activation energy, Arrhenius constant and model of solid state reaction as kinetic triplet can be obtained by the study of thermal decomposition kinetic in a solid state reaction. In the present work, the non-isothermal Differential Thermal Analysis (DTA) was used to study of kinetic triplet of thermal decomposition of Ocfol explosive with composition of 5% wax and 95% HMX explosive. The DTA thermograms of Ocfol were investigated in the heating rates of,, and C/min in an Argon atmosphere. The model-free methods of Kissinger-Akahira-Sunose () and Ozawa-Flynn-Wall (OFW) were used for calculation of activation energy. The average of activation energy was obtained 1.1±5. and 33.±. by and OFW methods respectively in the range of conversion fraction () of The kinetic triplet of activation energy, E a, Arrhenius constant (A) and the reaction model (functions of f() and g()) were also investigated using model-dependent methods. The obtained results were showed the A3 model with functions integral of [- ln(1-a)] 1/3 and differential of 3(1-a)[-ln(1-a)] /3, activation energy of -1 and loga of /s for thermal decomposition of Ocfol explosive. Keywords: Activation Energy, Differential Thermal Analysis, Kinetic Triplet, Ocfol Explosive. * Corresponding Author HR_POURETEDAL@mut-es.ac.ir "Journal of Energetic Materials" Volume 11, No.1, Serial No.9, Spring 01

2 (1). (E a ) (A) G(). A E a..[ 5].[7] HMX. (III) ( ) []. DSC HMX. FeCl 3.H O FeCl.H O HMX HMX [9]. DSC CP HMX % Al Cu,Ni,KClO 3.[ ] HMX HMX STA503 (DTA). - HMX. MIL-H- BAHR ( %95) A MIL-W-0553D ( %5) 5B -) HMX %95-1. %5 ( (T b ).[1] 1.[] TGA DTA, DSC 3.[3] [] (ICTAC). (1) : A(s) B(s) + C(g) ( 1) ICTAC : (1) = ktf = ( 1 ) k(t) : = exp ( ) ( ) (1).. G() (). 1- Safe Storage Lifetime - Differential Scanning Calorimetry 3- Differential Thermal Analysis - Thermal Gravimetric Analysis 5- International Confederation for Thermal Analysis and Calorimetry (ICTAC)

3 T o ( o C) 33/0 3/ 51/9 53/ T m ( o C) 57/ 59/ 0/ /7 () T f ( o C) 0/7 / 7/7 75/ ( o C/min) (ICTAC). (1) β A R ln i a, = ln( ) T, i Ea g( ) RT,, i E E.[1] (1) R β i T,i T (=H t /H o ) 3 ). H t (T f T o DTA DTA ). ( H o β i E a "". = 0/1-0/9 ().[15] = 0/1-0/9 1/T ln (β/t ) T o 0/9.. (3) (). 1/±5/ HMX. HMX.[131] OFW f().[1]. 10/0. -3 (1) DTA (T m =1-19 ). (β) -9.[11] (δ) HMX. (T m =5- ). HMX HMX A 1 HMX. T m. %7 HMX. A T m HMX RDX 1.[13 1] HMX. 9/ µv s/mg 3/9 (T f ) (T m ) (T o ) DTA Intensity (1) o C/min o C/min o C/min o C/min Temperature ( o C) DTA -1. o C/min - Kissinger-Akahira-Sunose 3- Total Heat Effect - Isoconversional 1- Royal Demolition Explosive

4 DTA ( 33/±/ )..[17-19] (, loga E a () ) (G(), (3) ). ( ) R ( ) Q. ln = ln T0 a ln / a T0 = ln a + 1 dh/dt d/dt=(1/h o β)(dh/dt) (3) () 3 T H t H 0 t T 0 (=H t /H 0 ) t (K).[0] R DTA. () ) ( ) 3(1-a)[-ln(1-a)] /3 [-ln(1-a)] 1/3 P R ( loga E a.. 13/5-15/ 1/s A3 G() 1.[1] (). f() exp f() th.[] (5) RSS = ( f ( ) th f ( ) exp) = min. 0/157 0/131 1/3 A3 (5) 0/5. () 1/T ln(β). β A. ( E a /R) R T ln( β ) ln(β/t) Ea, i A f ( ) da / dt = ln( ) E RT E a /T (K-1). = 0/1-0/9 1/T ln (β/t ) =0.9 =0. =0.7 =0. =0.5 =0. =0.3 = Conversion fraction, -3. OFW DTA =0.1 OFW () %90 %10 OFW OFW. (3) OFW 1- Avrami Erofeev

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