شهیدزاده, منصور
[ 1 ] - استفاده از عوامل پیوندی بورات استری در پیشرانه های جامد
Bonding agents are one of the most important components of solid propellants that enhance the interaction between solid particles and binders. Many bonding agents have been reported so far and sufficient laboratory studies have been carried out on their mechanism of action, including, hydantoin, isocyanorathe, vinyl ether, base-shif, etc. Borate esters are other group of bonding agents that mos...
[ 2 ] - بررسی اثر عاملیت هیدروکسیل بر خواص مکانیکی الاستومرهای پلی یورتانی بر پایه پلی بو تا دی ان با گروه هیدروکسیل انتهایی (HTPB)
Composite propellants are often identified by the type of polymeric binder used. The most commonly used polyol in recent time is the Hydroxyl Terminated Polybutadiene (HTPB). In order to evaluate the quality of three types of HTPB prepolymer, their polyurethanes elastomers were synthesized by one shot polymerization and structure-properties relationships of the prepared polyurethane have ...
[ 3 ] - سنتز و مشخصه یابی پلی(2،2- بیس(آزیدو‌متیل)-3،1-پروپیلن‌آدیپات) به عنوان بایندر پرانرژی
polyester polyol can be used in high energy propellant as a binder.In this research, polyazido polyester was synthesized from direct polycondensation reaction between adipic acid and 2,2-bis(bromomethyl)-1,3-propanediol. Then, azidation of poly bromoester afford polyazidoester as an energetic polyester. polyazidoester have identified and characterized by FTIR,HNMR,GPC,DSC and elemental analysis...
[ 4 ] - بررسی راهکارهای بهبود خواص حرارتی و مکانیکی پلی‌یورتان‌های بر پایه گلایسیدیل آزید پلیمر(علمی-ترویجی)
Glycidyl azide polymer (GAP) is a unique elastomeric binder with high heat of formation and high density due to enhanced thermal and performance properties of composite solid propellants. However, GAP has high glass transition temperature and poor mechanical properties that are limited its application as a binder in a composite solid propellant. In this paper , the efforts carried out on modifi...
[ 5 ] - بررسی خواص مکانیکی و حرارتی کوپلی یورتان های بر پایه GAP-PPG با نسبت های متفاوت
For improving the mechanical and thermal properties of polyurethanes based on glycidyl azide polymer (GAP), a series of polyurethane elastomers with two soft segments were prepared from hexamethylene diisocyanate (HDI) / (GAP) / (PPG) /TMP and isophorone diisocyanate (IPDI) / GAP/ PPG/ TMP formulation. The weight ratio of soft segments GAP/PPG in polyurethane samples is changed as following ord...
[ 6 ] - بررسی خواص حرارتی و مکانیکی پلی یورتان‌های بر پایه GAP
Glycidyl Azide Polymer is one of the most important energetic binders that is used in the composite solid propellant formulation. GAP is a unique binder with a positive heat of formation (+117.2 kJ⁄mol). In addition, GAP has good thermal and physical properties such as low glass transition temperature, low viscosity and high density compared to other energetic binders. GAP can be used as a bin...
[ 7 ] - سنتز و شناسایی نرم کننده واکنش پذیر پرانرژی جدید بر پایه گلیسیدیل نیترات
plasticizers are small and non-volatile molecules which to improve thermal and mechanical properties of polymers are added to it. One of the most important problems of plasticizers is migration to the outer surfaces of polymer matrix and thus reduce the mechanical and thermal properties and aging the polymeric material. In recent years to fix the problem related to the migration of plasticize...
[ 8 ] - مروری بر کاربرد نرم کننده های واکنش پذیر در پلیمرهای حاوی گروه جانبی آزیدی
Plasticizers are small molecules with low molecular weight. These compounds typically have an esteric structure. The plasticizers reduce the glass transition temperature and the viscosity of the polymer to enhance the flexibility and processability of polymer materials. The main problem with these additives is that, over time, they migrate from the polymeric matrix and exude to the surface of p...
[ 9 ] - بررسی روش‌های اصلاح شیمیایی ساختار پلی‌بوتادی‌ان با گروه انتهایی هیدروکسیل(HTPB)
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 ...
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