Reza Fareghi-Alamdari
College of Chemistry and Chemical Engineering, Malek-Ashtar University of Technology, Tehran, 16765-3454, I. R. Iran.
[ 1 ] - Spinel ferrites as efficient magnetically reusable nanocatalysts in the solvent-free synthesis of substituted trisphenols
A series of copper and cobalt substituted nanospinel ferrites have been synthesized by the hydrothermal method. These compounds were characterized by FT-IR, XRD, EDX, SEM and VSM techniques. All of the synthesized nanospinel ferrites were found to be highly efficient and magnetically recoverable in the solvent-free synthesis of substituted 2,6-(2-hydroxybenzyl)-phenols (trisphenols). A wide ran...
[ 2 ] - Efficient synthesis of trisphenols using reduced sulfonated graphene nanocatalyst under solvent free conditions
This study reports a new methodology for the efficient synthesis of trisphenol compounds using the reaction of 2,6-bis(hydroxymethyl) phenols with phenols under heterogeneous conditions. A sulfonated reduced graphene oxide (RGO-SO3H) nanocatalyst was used to promote the reaction under solvent-free conditions. A range of trisphenol compounds were produced in the presence of this c...
[ 3 ] - مروری بر روش‌های سنتز آلکیل‌آزیدها و کاربردهای آنها در صنایع نظامی
Azide compounds have vast applications in military and civilian industries. Some of their applications include use in drug or drug intermediate production, macro cyclic polymer production through click reaction, automobile airbag production, energetic binders such as GAP, oxidizer, plasticizer and burning rate control additive in solid composite propellants. Due to the wide range of appli...
[ 4 ] - یک روش نوین و کارآمد جهت سنتزترکیب 1و4- بوتان دی اُل به عنوان عامل گسترش دهنده زنجیره
The aim of this -study is the synthesis of 1,4-butanediol (BDO), as chain extender, which is a component of the propellant for improving its mechanical properties. In this research a new and efficient method for the synthesis of BDO from 2-bromoethanol has been reported. In roder to do this, first , the hydroxyl group of 2-bromoethanol was protected by triphenylmethyl chloride (TrCl). Then the ...
[ 5 ] - سنتز نرم‌کننده پرانرژی N- بوتیل-N - (2- نیتروکسی اتیل) نیترآمین (بوتیل ننا) در حضور مایعات یونی اسیدی قابل بازیافت
Use of energetic plasticizer, N-Butyl-N-(2-Nitroxyethyl) Nitramine (BuNENA), in the propellants’ formulations, has some advantages such as not migration in the fuel, high thermal stability, low sensitivity of the propellant formulation, improvement in mechanical properties and raising the impulse due to light molecular weight of combustion gases. In this study two acidic ionic liquids ([(...
[ 6 ] - روشی کارآمد جهت سنتز 4,2-دی نیتروتولوئن از طریق نیتراسیون انتخابی تولوئن و مشتقات آن در حضور مایعات یونی اسیدی جدید
Plasticizers are compounds which add to solid propellants’ formulations to improve their mechanical properties. These materials have key role in the control of mechanical properties. 2,4-Dinitrotoluene (2,4-DNT) is one of the most important plasticizers of double based propellants. In this study, new series of Brønsted acidic ionic liquids (ILs) have been prepared and introduced as...
[ 7 ] - مطالعه خواص مکانیکی و سرعت سوزش یک نمونه پیشرانه جامد دو پایه با پایدارکننده‌های آکاردیتII،سانترالیتI و یا 2 نیترو دی فنیل آمین
Mechanical properties and burning rate are very important parameters for solid propellants. In this work, the effects of quality and quantity of stabilizers as AkarditeII, 2-NDPA and CentraliteI on the Mechanical properties and burning rate of double-based is investigated. The results showed that, by CentraliteI increased mechanical properties of propellant and for AkarditeII and 2-NDPA stabili...
[ 8 ] - سنتز، شناسایی و بررسی خواص6،1 - بیس (3- متیل ایمیدازولیوم-1- ایل) هگزان دی سیانامید به عنوان مایع یونی هایپرگول
Some mono and di imidazolium-based ionic liquids with dicyanamide were synthesized and characterized. The synthesis of these compoundes were done based on alkylation reaction of N-methylimidazole followed by anion exchange. The structure of novel ionic liquids were identified by using FT-IR, 1HNMR spectroscopies and elemental analysis. Among the synthesized ionic liquids, thermal properties of ...
[ 9 ] - سنتز و بررسی رفتار حرارتی مایعات یونی هایپرگول جدید بر پایه کاتیون ایمیدازولیوم و آنیون دی سیانامید
A hypergolic bipropellant s consist of fuels and oxidizers that can ignite rapidly upon mixing without external ignition devices . This self –ignition technology makes the engine ignition more reliable with repeated use. Recently, ionic liquids with the dicyanamide anion which shown good hypergolic properties when contacted with common oxidizer such as concentrated nitric acid, were attracte...
[ 10 ] - افزایش سرعت سوزش پیشرانه با استفاده از صفحات فلزی کار گذاشته شده درون گرین پیشرانه (علمی-ترویجی)
The method of foil embedding is employed in solid propellant motors with end-burning configuration, thereby significantly improving the burning rate of the propellants. These foils provide such amplification by locally augmenting heat feedback from propellant combustion products to unburned solid material, with resultant increase in burning surface area. Burning rate would raise with the incr...
[ 11 ] - تاثیر نوع و مقدار پایدارکننده شیمیایی روی گرمای احتراق و پایداری پیشرانه جامد دوپایه
Abstract In this work, the effects of quality and quantity of three stabilizers as AkarditeII, 2-NDPA and CentraliteI on the heat of explosion and stability of double-based is investigated The results showed that, by increasing the amount of AkarditeII and 2-NDPA increased stability of propellant and decreased heat of explosion. By replace AkarditeII and 2NDPA with CentraliteI and AkarditeI...
[ 13 ] - An Improvement to the Properties of GAP Binder with Energetic Ionic Liquids
Glycidyl azide polymer (GAP) is used as a binder in the propellants. Energetic ionic liquids are used as a plasticizer to correct the properties of polymer. In this study, first ionic liquid was bonded to the GAP by certain amount and then the energetic anions of nitrate (NO3) and azide (N3) were used to exchange anion. FTIR analyses confirm accurately anions exchange. DSC, viscometer and heat ...
[ 14 ] - Spinel ferrites as efficient magnetically reusable nanocatalysts in the solvent-free synthesis of substituted trisphenols
A series of copper and cobalt substituted nanospinel ferrites have been synthesized by the hydrothermal method. These compounds were characterized by FT-IR, XRD, EDX, SEM and VSM techniques. All of the synthesized nanospinel ferrites were found to be highly efficient and magnetically recoverable in the solvent-free synthesis of substituted 2,6-(2-hydroxybenzyl)-phenols (trisphenols). A wide ran...
[ 15 ] - Efficient synthesis of trisphenols using reduced sulfonated graphene nanocatalyst under solvent free conditions
This study reports a new methodology for the efficient synthesis of trisphenol compounds using the reaction of 2,6-bis(hydroxymethyl) phenols with phenols under heterogeneous conditions. A sulfonated reduced graphene oxide (RGO-SO3H) nanocatalyst was used to promote the reaction under solvent-free conditions. A range of trisphenol compounds were produced in the presence of this c...
[ 16 ] - بررسی تأثیر نرم کننده پرانرژی مایع یونی بر پایه ایمیدازولیوم بر خواص حرارتی نیتروسلولز
In this paper investigates an energetic imidazolium ionic liquid plasticizer (ILP) effect on the degradation kinetics of nitrocellulose, which is a important component of double based solid propellants. For better comparison and evaluation, diethyl phthalate (DEP) plasticizer, which has a structure similar to ILP, was also evaluated. Heat of combustion analysis was performed to evaluate the en...
[ 17 ] - سنتز و شناسایی پلی(2-بوتین-1و4-دی‌ال-کو-مالیک اسید) به عنوان بایندر خنثی و مشبک کردن با گلیسیدیل آزید پلیمر
Unsaturated polyesters have several applications in organic chemistry such as click reaction, radical reaction, etc. In this research, in the first step, a new and inert type of unsaturated binder containing internal alkyne groups was synthesized. For this purpose, condensation polymerization of 2-butyne-1,4-diol, and DL-malic acid was performed at 130 °C without solvent. Thermal properties w...