AMMONIUM PERCHLORATE (AP) IS ONE OF THE MAIN OXIDANTS WHICH HAS BEEN USED IN VARIOUS PROPELLANTS CONSIDERING ITS LIMITATION IN LOADING IN ROCKETS, IT IS CRUCIAL TO IMPROVE THE DECOMPOSITION EFFICIENCY OF AP TO SATISFY THE REQUIREMENT OF HIGH ENERGY GENERATION AT LOW BURNING TEMPERATURE [1]. AS SPECIFIC FEATURE OF THE THERMAL DECOMPOSITION OF AP IS ITS EXTREMELY HIGH SENSITIVITY TO THE ACTION OF VARIOUS ADDITIVES [2]. AMONG THESE ADDITIVES, METAL OXIDES (MOX) ARE USED TO ACCELERATING THE THERMAL DECOMPOSITION OF AP. MOX NANO PARTICLES WERE DEPOSIT ON THE SURFACE OF AP PARTICLES AS EITHER A CONTINUOUS THIN LAYER OR SMALL CLUSTER [3]. IN THIS STUDY, AP POWDER WERE COVERED HOMOGENEOUSLY BY MOX NANOPARTICLES TO FORM THE SHELL-CORE STRUCTURE. IN THE PRESENT WORK CU(NO3)2 WAS USED TO PREPARE THE CUO AS A SHELL WHICH IS MECHANICALLY MIXED WITH AP WITH VARIOUS MASS RATIO MOX:AP OF 4:100, 6:100,8:100 AND THE EFFECT ON THERMAL DECOMPOSITION OF AP WAS EVALUATED BY DIFFERENTIAL SCANNING CALORIMETRY (DSC). THE RESULT WAS SHOWED SIGNIFICANT EFFECT IN LOWERING THE DECOMPOSITION TEMPERATURE AND INCREASING THE HEAT RELEASED.

AMMONIUM PERCHLORATE (AP) IS ONE OF THE MAIN OXIDIZING AGENT IN COMPOSITE SOLID PROPELLANTS, IN WHICH AP PLAYS A SIGNIFICANT ROLE IN THE BURNING PROCESS OF THE PROPELLANT. THE BURNING RATE OF AP IS MODIFIED BY THE ADDITION OF SMALL AMOUNT OF ADDITIVES [1]. METAL OXIDES (MOX) ARE USED WIDELY AS A KIND OF EFFICIENT CATALYST FOR THERMAL DECOMPOSITION OF AP [2]. MOX NANO PARTICLES ARE EXPECTED TO FORM THE EXTERNAL SHELL SO THAT THE SHELL-CORE NANOCOMPOSITES OF MOX/AP ARE PRODUCED. IN FACT, SYNTHESIZED MOX NANOCOMPOSITES ARE HOMOGENEOUSLY DISTRIBUTED ON THE SURFACE OF AP TO OVERCOME THE MOX AGGLOMERATION FOR THE CONVENTIONALLY MECHANICAL MIXTURE. IN THIS STUDY, THE SHELL-CORE NANOCOMPOSITES OF CUO/AP WERE SUCCESSFULLY SYNTHESIZED BY FACILE LIQUID DEPOSITION METHOD AT ROOM TEMPERATURE FOR ENHANCING THEIR SELF-CATALYTIC PROPERTIES IN THE DECOMPOSITION OF AP. IN THIS WORK CUCL2 WAS USED TO PREPARE THE SHELL (CUO)/CORE (AP) WITH VARIOUS MASS RATIO OF 4:100, 6:100, 8:100. THE SELF–CATALYTIC PROPERTIES OF CUO/AP NANOCOMPOSITES IN THE THERMAL DECOMPOSITION OF AP WERE INVESTIGATED BY DIFFERENTIAL SCANNING CALORIMETRY (DSC) MEASUREMENTS. THE RESULTS SHOW THAT THE TEMPERATURE OF DECOMPOSITION WAS DECREASED WHILE THE RELEASED ENERGY WAS INCREASED.

AMMONIUM PERCHLORATE (AP) IS AN INORGANIC SALT THAT IS USED WIDELY IN LABORATORIES AND INDUSTRIALS. AGGLOMERATION AND NO CONTROL ON PARTICLE SIZE IS IMPORTANT PROBLEM ABOUT AP.COATING IS A METHOD TO PREVENT AGGLOMERATION OR TO IMPROVE THERMAL DECOMPOSITION PROPERTIES OF AP. ORGANOSILICON COMPOUNDS ARE ONE OF COATING AGENT GROUP THAT IS USED FOR COATING OF AP [1-3]. IN THIS RESEARCH AP PARTICLES ARE COATED WITH POLY (METHYL HYDROGEN SILOXAN) AS ORGANOSILICON POLYMER BY SOLVENT METHOD AND COMPARED WITH INDUSTRIAL AP (COATED WITH SODIUM LAURYL SULFATE) AND UNCOATED AP USED AS REFERENCE SAMPLE. THIS COATING AGENT CAN CREATE STEADY AND VERY THIN FILM ON SURFACE OF AP PARTICLES (LESS THAN 100 NANOMETER) SO PURITY OF AP THAT IS COATED IN THIS RESEARCH IS MORE THAN INDUSTRIAL AP. DIFFERENTIAL SCANNING CALORIMETRY (DSC), THERMOGRAVIMETRY (TG), AND SCANNING ELECTRON MICROSCOPY (SEM) HAVE BEEN EXPLOITED TO INVESTIGATE THE THERMAL DECOMPOSITION PROPERTIES, HEAT OF DECOMPOSITION, AND COATING MORPHOLOGY OF PURE AND COATED SAMPLES. THE RESULTS SHOWED THAT COATED AP WITH POLY (METHYL HYDROGEN SILOXAN) HAS ELIMINATED AP AGGLOMERATION COMPLETELY. THE THERMAL ANALYSIS OF COATED AP, PREPARED AT OPTIMIZED COATING CONDITIONS, SHOWED THAT ITS THERMAL DECOMPOSITION TEMPERATURE INCREASES ABOUT 15OC WITH COMPARE TO UNCOATED SAMPLE WHEREAS PHASE TRANSITION TEMPERATURE IS CONSTANT APPROXIMATELY. ALSO HEAT OF DECOMPOSITION OF POLY (METHYL HYDROGEN SILOXAN) COATED AP IS MORE THAN INDUSTRIAL AP ABOUT 30 J/G. IN ADDITION, TG CURVES SHOW THAT START AND END OF WEIGHT LOSS TEMPERATURE OF COATED AP ARE SHIFT TO HIGHER TEMPERATURE. IN THE OTHER WORD, WITH THIS COATING, THERMAL STABILITY AND HEAT OF DECOMPOSITION OF AP ARE INCREASED AND PROBLEMS OF STORING AND MOISTURE ABSORPTION OF AP ARE SOLVED.