Introduction of a New Binder Based on CTBN/DEO and Investigation of Mechanical and Thermal Properties of Elastomer Resulting from its Curing Reaction

Despite the unique properties of epoxy resins, their use is limited in many cases due to their low impact resistance. One of the methods to overcome this limitation is to use compounds for increase Toughness such as carboxyl-terminated butadiene acrylonitrile (CTBN) (94% Wt.) in the epoxy matrix. In this study, the curing reaction of CTBN with 1,2,7,8 diepoxyoctane (DEO) (5% Wt.) in the presence of two types of amine 1, 1′-Isophthaloyl bis (2-methylaziridine) (HX-752) and triethanolamine (TEA) as catalyst is investigated. In order to evaluate the performance of the proposed binder, elastomers with different formulations were prepared and tested for mechanical and thermal properties. The results of mechanical and thermal properties of elastomers produced in the presence of TEA in comparison with HX-752 showed that the tensile property (234.2%), cross-linking density (111.8), storage modulus, and glass transition temperature (43.9°C) have increased. Due to the improvement of the properties, it is predicted that the produced binder can be used in the formulation of composite solid propellants and PBX explosives, as well as liner and insulation coatings with proper performance.