TETRACHLOROPHTHALIC ANHYDRIDE-BASED FLAME-RETARDANT CHLOROPOLYESTERS FOR INHIBITION OF DOUBLE-BASE PROPELLANTS

Seven unsaturated chloropolyesters based on tetrachlorophthalic anhydride (TCPAn) maleic anhydride (MAn), and propylene glycol (PG) (designated as CP-1) and TCPAn, MAn, and polyethylene glycol molecular weight 200 (PEG-200) (designated as CP-2), and TCPAn, MAn, and mixed glycols (PG & PEG-200 in different molar proportions) and designated as CPM-2, CPM-4, CPM-6, etc. (depending upon molar proportions) have been synthesized. The flame-retardant characteristics have been assigned by measuring heat resistance (loss in weight) and flame retardance (burning rate), and it is found that in these chloropolyesters thermal stability increases as chlorine percentage increases. CPM-9 with 30% styrene (designated as CPM-9s) has been selected for inhibition and static evaluation trials, after conditioning at ambient, cold ( minus 40 degree C), and hot ( plus 50 degree C) temperatures. The nature of pressure-time profiles indicate the suitability of 'CPM-9s' for the inhibition of double-base (containing 2-NDPA) propellants.