On the Elastomers Derived from Polybutadiene-Acrylic Acid-Acrylonitrile Terpolymer as a Fuel Binder

Some characteristic properties of a polybutadiene - acrylic acid - acrylonitrile terpolymer (PBAN) and of the elastomers derived from it were determined to obtain the fundamental information as fuel binders for propellants. The chemical composition of the prepolymer (RF-2) was determined to be:[{−CH2−CH=CH−CH2−}84.0{−CH2−CH(CN)−}12.6{−CH2−CH(COOH)−}3.4]n,and it was found to be a Newtonean fluid. Since the prepolymer was found to be, on the average, 1.2 functional, much mono- or non-functional portion is probably included in it. The tensile properties of the elastomer, based on the cured PBAN, were not as good as those of telechelic elastomers, as far as the same curing agents were concerned. This may be attributed to the influence of the random distribution of the cross-linking sites and to that of the resultant terminal sections of the elastomer. The ultimate tensile strength and ultimate elongation of the PBAN elastomers were in the range of 3–6 kg/cm2 and 100–400% respectively. It should be remembered ...