اشرفی, مهدی
سازمان تحقیقات و جهاد خودکفایی نزسا
[ 1 ] - بررسی اثر اندازه و شکل پودر آلومینیوم نانو ساختار بر تجزیه حرارتی PBX بر پایه HMX
In this research, the effects of the particle size and shape of aluminum powder on the kinetics and thermodynamic properties of HMX thermal decomposition in a PBX formulation were investigated. Nano-structured aluminum powder has flaked shape and thickness of about 20-30 nm. Kinetics and thermodynamic parameters were calculated by both Kissinger and Flynn-Wall-Ozawa (FWO) methods based on diffe...
[ 2 ] - سنتز و فرمولاسیون سیستم بایندر- نرم‌کننده NHTPB-NPB و بررسی خواص عملکردی آن در PBXN-109 اصلاح شده
In this work, nitration of low molecular weight polybutadiene (PB) by a convenient and inexpensive procedure has been investigated. The product (Nitropolybutadiene (NPB) energetic plasticizer) 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 dioctyladiphate (DOA) inert...
[ 3 ] - مقایسه خواص پیشرانه‌های جامد مرکب بر پایه HTPB و NHTPB/HTPB
Hydroxyl terminated polybutadiene (HTPB) is the most commonly used binder in composite solid propellants. However, due to its non-energetic character, in practice it is just a dead weight; Therefore, replacing HTPB with an energetic polymer is essential. In this research, nitrated hydroxyl terminated polybutadiene resin (NHTPB) with 12.2% nitration rate, in combination with HTPB resin was used ...
[ 4 ] - اثر مقدار دی‌مریل دی‌ایزوسیانات بر رفتاررئولوژیکی و خواص مکانیکی یک پیشرانه جامد مرکب بر پایه HTPB
Several parameters affecting the rheological and mechanical properties of solid composite propellants. Among them, the molar ratio of isocyanate (NCO) to hydroxyl (OH) groups (R value) is one of the important factors. In this research, the effects of changing in the weight ratio of dimeryl diisocyanate (DDI) curing agent related to hydroxyl terminated polybutadiene investigated on different pr...
[ 5 ] - بهینه‌سازی رئولوژیکی یک نمونه پیشرانه جامد مرکب با افزایش مالئیک انیدرید
Viscosity is one of the important parameters in design and production of composite solid propellants. Propellants with low end of mix (EoM) viscosity and longer pot-life have suitable condition for casting process. Several factors control the rheology behavior of propellants. In some cases, it may be necessary to apply some additives in order to optimize the rheology of the formulation. In this...
[ 6 ] - اثر نانو ذرات میله‌ای‌شکل اکسید آهن هماتیت بر خواص یک پیشرانه جامد مرکب
Iron oxide as a burning rate catalyst commonly used in many of solid composite propellants. As the particle size of this component decreased, the final properties of the propellant change. In this research, effects of using 1 percent by weight of nano hematite iron oxide (α-Fe2O3) investigated on properties of an HTPB/AP/Al formulation and compared with the same propellant containing micronized...
[ 7 ] - تأثیرات مقدار نانو اکسید تیتانیوم (IV) زیر میکرون بر خواص پیشرانه HTPB/AP/Al
Titanium (IV) oxide as a burning rate catalyst is commonly used in some of the solid composite propellants. As the particle size of this component decreases, the final properties of the propellant will be changed. In this research, effects of using submicron titanium oxide, up to 0.5 percent by weight, have been investigated on properties of an HTPB/AP/Al propellant. TiO2 powder has relatively ...
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