In this research a reactive energetic plasticizer (REP) was synthesized that contain an activated terminal alkyne group and expected to give rise to azide-alkyne 1, 3-dipolar cycloaddition, and prevents the migration of plasticizer to the external surface of polymers. This plasticizer contains an energetic group (ONO2) and increase energetic performance and oxygen balance. Propargyl Terminated Poly Glycidyl Nitrate (PTPGN)) was synthesized and characterized by DSC, GPC, FTIR and 1HNMR. The result of GPC showed that the Mn is about 731 g/mol. The plasticizer has oligomeric structure. DSC thermogram showed that the glass transition temperature is-66. 50C. This plasticizer degraded at 170° C and it´ s degradation take place in two stages.

Reactive Powder Concrete (RPC) is an ultra high performance concrete which has superior mechanical and physical properties. The RPC is composed of cement and very fine powders such as crushed quartz (100–600 mm) and silica fume with very low water/binder ratio (W/B) (less than 0.20) and Super Plasticizer (SP). The RPC has a very high compressive and tensile strength with better durability properties than current high performance concretes. Application of very low water/binder ratio with a high dosage of super plasticizer, different heat curing processes and pre-setting pressure improve mechanical and physical properties of RPC. In this study, the RPC is composed of available materials in Iran. Two different mixing proportions, different water/binder ratios for preparation of samples, different super plasticizer dosages, five different (0, 25, 50, 100 and 150 MPa) pre-setting pressure and 7 different curing regimes were used in samples preparation and experiments. Results showed that appropriate water/binder ratio and super plasticizer dosage, higher temperature and pre-setting pressure increase the workability, density and compressive strength of compositions.

In the present study, the improvement of the mechanical and thermal properties of GAP by its copolymerization with polytetrahydrofuran is investigated. New energetic triblock copolymer was synthesized using 1, 4-Butanediol as initiator and cation ring polymerization method using epichlorohydrin. Also, tetrahydrofuran monomers is used in the presence of Boron trifluoride as catalyst. The triblock copolymer was characterized by GPC, 13CNMR, ˡ HNMR, IR. The thermal behavior of the synthesized copolymer showed the increase in thermal stability and the reduction in glass transition temperature of the copolymer compared to GAP. Compatibility of energetic plasticizers on copolymer was also studied. In addition, the mechanical properties of elastomers based on the synthesized copolymer were studied.

A way to increase the specific impulse of solid propellants is using the energetic components such as energetic binder or energetic plasticizer in the propellant formulations. Hydroxy terminated poly butadiene (HTPB) is the one of pre-polymer which was specifically synthesized for its use as a binder in propellant. Incorporating PEG into HTPB chains increases the polarity of binder. In this study, in the first step, elastomers of HTPB/PEG blend are prepared and their mechanical and thermal properties are investigated. Then, the propellant based-on HTPB/PEG blend was prepared and its mechanical properties were compared to the propellant based-on HTPB binder. Incorporation of PEG into the binder, increases the stress and elongation of the propellant and also, influences its oxygen balance. In the solid propellant with 75% solid loading, theoretical and semi empirical specific impulse were increased to 7. 9s and 6. 9 respectively, by the addition of BuNENA.

Hydroxyl terminated polybutadiene (HTPB) is the most important and versatile binder used in the formulation of composite solid propellant. However, HTPB is an inert binder and immiscible with traditional energetic plasticizers. In this research, two types of energetic plasticizer, 2-ethylhexyl nitrate (2EHN) and 2-ethyl-2-buthyl-1, 3 dinitrate propane (EBDP), which have C /-ONO2 ratio greater than 4 are synthesized and characterized by FT-IR and 1H NMR. Performance of these compounds as energetic plasticizer have been investigated by measuring their heat of decomposition, heat of combustion, glass transition temperature and heat of formation. In addition, the compatibility of the selected plasticizers with HTPB, have been evaluated by calculation of Hansen solubility parameter and measurement of glass transition temperature (Tg) by differential scanning calorimeter (DSC). Low value of miscibility parameter (Δδ) and appearance of a single glass transition Tg is a reason for miscibility of the plasticizer in HTPB and formation a homogeneous binder/plasticizer system. Furthermore, the viscosity measurement of resin in different weight percent of plasticizer have shown that the equal mixture of two plasticizers provide the best results for process ability of resin.

In this work, nitration of low molecular weight polybutadiene (PB) by a convenient and inexpensive procedure has been investigated. The NPB product (Nitropolybutadiene) was characterized by FT-IR, 1H-NMR, GPC, TGA, DSC etc. Then NPB energetic polymer plasticizer and nitro-hydroxyl terminated polybutadiene (NHTPB) binder have been replaced with dioctyl adiphate (DOA) inert plasticizer and HTPB binder in PBXN-109, respectively and the new formulation was prepared with energetic binder system as named PBXN-109EB. Density, hardness, vacuum stability, mechanical property, viscosity, glass transition temperatures (Tg), sensitiveness and performance properties of PBXN-109EB were compared to standard PBXN-109. The results show that new PBX not only has all requirements of PBXN-109, but also has enhanced performance properties in velocity, blast pressure, impulse and visual parameters of explosion. So NHTPB/NPB binder system (binder/plasticizer) can be used as a new energetic binder system in high performance polymer bonded explosives.