نتایج جستجو برای: ریزساختار htpb
تعداد نتایج: 2554 فیلتر نتایج به سال:
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 ...
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...
Aim: The purpose of this pilot study was to genetically identify and characterize Coxiella burnetii from Amblyomma varigatum ticks collected on cattle in North central Nigeria. Materials and Methods: A total of 40 partially fed ticks morphologically identified as adult A. variegatum ticks collected from cattle owned by Fulani pastoralists were evaluated for the presence of C. burnetii using PCR...
پلی بو تا دی ان با گروه هیدروکسیل انتهایی مهمترین و پرکاربردترین بایندر مورد استفاده در پیشرانه های کامپوزیت است. با این وجود ، رزین htpb یک پیش پلیمر خنثی محسوب شده و امتزاج پذیری مطلوبی با نرم کننده های پر انرژی متداول ندارد. در این تحقیق دو نوع نرم کننده پرانرژی نیترات استری، 2- اتیل هگزیل نیترات(2ehn) و 2- اتیل -2- بوتیل- 1،3 دی نیترات پروپان(ebdp)، با نسبت c/-no2 بزرگتر از 4 ،سنتز و با طیف...
پیشرانههای کامپوزیتی در اغلب موارد از طریق نوع بایندر مورد استفاده مشخص میشوند. در حال حاضر پلی بوتادیان با گروههای هیدروکسیل انتهایی) (htpb مهمترین بایندر مورد استفاده در پیشرانه های جامد کامپوزیتی است. در این تحقیق به منظور ارزیابی سه نوع htpb رادیکالی، ابتدا الاستومرهای پلی یورتانی آن به روش یک مرحلهای تهیه و سپس ارتباط بین ساختار-خواص آنها مورد بررسی قرار گرفت. برای این منظور، ساختا...
Effect of temperature and curing agent type parameters on rheological behavior of binder system based on Hydroxyl terminated Polybutadiene (HTPB) is important in the aspect of production for medium and large-size grains. In this research, the effect of casting temperature 40, 50 and 60 ºC) and chemical structure of curing agents (TDI, IPDI and HDI) on rheological behavior of a binder system bas...
Aluminium powder (AP) formulated polyamide 6, 6 (PA 6), cotton fabric and hollow tubular polyester beg (HTPB) were experimented for spectral, chromatic imaging principle of woodland desertland camouflage textiles in visible (Vis) infrared (IR) spectrum under three-dimensional background illumination ultraviolet (UV)-Vis-IR concealment detection target signature, AP practiced by defense professi...
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