نتایج جستجو برای: nitro htpb
تعداد نتایج: 13347 فیلتر نتایج به سال:
Hydroxyl terminated polybutadien that is known as HTPB resin is a liquid hydrocarbon polyol that is commonly used in preparation of solid composite propellants. Because of unsaturated nature of repeating unit of HTPB polymer , it has high potential for oxidative aging . In this paper ,we have investigated aging behaviors of two types of HTPB which having various content of phenolic antioxida...
Abstract The interfacial interaction between the main oxidant filler ammonium perchlorate (AP) and hydroxyl-terminated polybutadiene (HTPB) matrix in AP/HTPB propellants were studied via an all-atom molecular dynamics simulation. results of simulation showed effects microscopic cross-linked structure matrix, stretching rate during uniaxial stretching, contact area on mechanical properties, such...
The mechanical properties of the final energetic composite depend mainly on the HTPB prepolymer microstructure; thus, the prepolymer microstructure of HTPB is one of the important factors influencing the mechanical properties of high-energy composite based on HTPB resin. In this paper, the effect of microstructure parameters of HTPB on the behavior and mechanical properties of its high-energy c...
Molecular dynamics simulations were carried out to study the effects of interface interactions between a crystalline structure and a plastic bonded explosive (PBX) system. In this work, the hydroxyl-terminated polybutadiene (HTPB) represents the polymer, isophorone diisocyanate (IPDI) is the diisocyanate and dioctyl adipate (DOA) is the plasticizer. Two different crystal high explosives compone...
Hydroxyl terminated polybutadiene (HTPB) is a low molecular weight polymer which has used in various industries. The good mechanical and thermal properties of HTPB based polyurethane is caused to use it as a binder for the solid composite propellants and plastic bonded explosives. Also, The presence of double bonds and hydroxyl end groups in the structure of HTPB can provide an opportunity ...
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 ...
The binder is an essential ingredient of solid composite propellants. Today, the industrial military scientists have been focused on finding and developing the new energetic binders to enhance the performance of the composite propellants. In this research, triblock hydroxyl-terminated polybutadiene (HTPB) with Glycidyl azide polymer (GAP) was synthesized as a new energetic binder. In the first ...
مطالعه اثر پارامترهای مواد بر عمر کاربری کامپوزیتهای پرانرژی بر پایه پلیبوتادیان با هیدروکسیل انتهایی (HTPB) برای تولید دانههای متوسط و بزرگ حائز اهمیت است. در این مقاله، افزایش عمر کاربری کامپوزیتهای پرانرژی بر پایه HTPB، از راه بهکارگیری سامانه پخت دوگانه متشکل از TDI و IPDI مطالعه شدهاست. همچنین، اثر دو کاتالیزگر پخت دیبوتیلتین دیلورات (DBTDL) و فریک تریس استیلاستونات (FeAA) بر و...
Hybrid rockets have many advantages over pure solid or liquid propellant rockets, but low fuel regression rates and correspondingly thrust hindered their application to operational systems. Paraffin-based fuels regress significantly faster than traditional polymeric formulations, such as HTPB, paraffin inclusion in HTPB represents a potential tool for performance augmentation hybrid rockets. A ...
The MaCH-SR1 project involved the design of a 1000lb thrust hybrid rocket with the effort being undertaken during two semesters by 8 senior aerospace engineering students at the University of Colorado at Boulder. The 2002-2003 team was the second year for the project, as the previous team built two static engines and performed test burns on both. The hybrid implemented a liquid O2/HTPB oxidizer...
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