Synthesis of Hydroxy Aminimide from Unsymmetric Dimethyl Hydrazine Through One Pot Reaction: A New Nanoscale Access for the Reutilization of Unsymmetrical Dimethyl Hydrazine

2020 ◽  
Vol 20 (8) ◽  
pp. 5123-5130
Author(s):  
Hu Cui ◽  
Youzhi Zhang ◽  
Xuanjun Wang ◽  
Liu Yang
Keyword(s):  
Acid Methyl Ester ◽  
Decomposition Temperature ◽  
Curing Agent ◽  
Epoxide Resin ◽  
Reaction Conditions ◽  
One Pot ◽  
Acid Methyl ◽  
Ft Ir ◽  
Thermal Stability Of ◽  
Better Than

In this paper, two new kinds of hydroxy aminimide were nanoscale synthesized utilizing Unsymmetrical dimethyl hydrazine (UDMH) and economical carboxylic acid methyl ester was analyzed through one pot reaction. The reaction conditions were examined and the best reaction temperature was 20 °C with the reaction time of 60 h, achieving a highest yield of 83.21% for the two aminimides. Structures of the final products are characterized by GC-MS, FT-IR and NMR. Then the thermal stability of the aminimide is tested and it is found that the decomposition temperature of one aminimide is 65.20 °C, which is better than any other aminimides used for the latent curing agent of epoxide resin.

Synthesis and Optimization of Trimethylolpropane Rapeseed Oil Ester

2014 ◽  
Vol 1015 ◽  
pp. 610-614
Author(s):  
Ying Wang ◽  
Cun Zhou ◽  
Guo Zheng ◽  
Yu Sun
Keyword(s):  
Thermal Stability ◽  
Fatty Acids ◽  
Rapeseed Oil ◽  
Acid Methyl Ester ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Base Oil ◽  
Acid Methyl ◽  
Thermal Stability Of

Lubricant base oil is an environmentally friendly lubricant with good lubricity and biodegradability. The thermostability and stability of rapeseed oil get improved through chemical modification. Fatty acid methyl ester (FAME),prepared by rapeseed oil as starting material with methanol by transesterification,the composition of FAME was detected by gas chromatograph-mass spectrometer (GC-MS).Trimethylolpropane (TMP) esters of fatty acids were synthesized by transesterifying FAME with TMP using zinc oxide as catalyst. The structures of products were characterized by mean of FTIR. The reaction conditions were studied and optimized, the optimum conditions were as follows: the temperature at 140°C~150°C, the reactant mass ratio of 1:9, the reaction time for 6 h, the mass content of catalyst of 0.5%.The thermal stability of product was conducted by thermogravimetry (TG) .It could be concluded that TMP esters of fatty acids possess better thermal stability.

Evaluation of the Impact of Fatty Acid Methyl Ester (FAME) Contamination on the Thermal Stability of Jet A

2013 ◽  
Author(s):  
Jr Morris ◽  
Shardo Robert W. ◽  
Higgins James ◽  
Cook Kim ◽  
Tanner Rhonda ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Fatty Acid ◽  
Methyl Ester ◽  
Fatty Acid Methyl Ester ◽  
Acid Methyl Ester ◽  
Acid Methyl ◽  
The Impact ◽  
Thermal Stability Of

Efficient one-pot formation of 4-N-substituted 2,4-dihydro-3H-1,2,4-triazolin-3-ones from primary amines using N′-(ethoxymethylene)hydrazinecarboxylic acid methyl ester

2006 ◽  
Vol 47 (38) ◽  
pp. 6743-6746 ◽  
Author(s):  
Ning Shao ◽  
Cheng Wang ◽  
Xianhai Huang ◽  
Dong Xiao ◽  
Anandan Palani ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Acid Methyl Ester ◽  
Primary Amines ◽  
One Pot ◽  
Acid Methyl

Carboxyl graphene reinforced melamine-based polyamide nanocomposites

2021 ◽  
pp. 089270572110514
Author(s):  
Himanshu V Madhad ◽  
Dilip V Vasava
Keyword(s):  
Electron Microscopy ◽  
Decomposition Temperature ◽  
Differential Scanning Calorimetric ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Mild Conditions ◽  
Thermal Stability Of ◽  
Infrared Techniques ◽  
Scanning Electron

Over the years, various types of techniques have been used for the synthesis of nanocomposites. In this work, melamine-based polyamide (PA) was synthesized using a one-pot polycondensation method under mild conditions. carboxyl graphene (CG)/PA nanocomposites (CGMPA) were prepared by CG nanofiller loadings of 1, 3, and 5 wt.% via delamination/adsorption approach. The prepared CGMPA nanocomposites were characterized using different analyses, such as Fourier transform infrared techniques (FTIR), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), differential scanning calorimetric (DSC), and thermogravimetric analysis (TGA). The effects of the CG on the thermal properties of the CGMPA nanocomposites were significant. The results showed that the melting temperature (Tm) of neat PA and CGMPA were increased from 378°C to 393°C suggested better dispersion of CG in PA matrix. The decomposition temperature of PA was increased from 451°C to 463°C in CGMPA nanocomposites indicates the better thermal stability of PA matrix by addition of CG.

scholarly journals Effect of hydrotreating in biodiesel on the growth of deposits in the combustion chamber as a solution for the deposits reduction in the usage of biodiesel

2018 ◽  
Vol 67 ◽  
pp. 02014
Author(s):  
Ary Budi Mulyono ◽  
Bambang Sugiarto ◽  
Muchammad Taufiq Suryantoro ◽  
Hari Setiapraja ◽  
Siti Yubaidah ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Alternative Fuels ◽  
Acid Methyl Ester ◽  
Mineral Resources ◽  
Biodiesel Fuel ◽  
Fuel Quality ◽  
Fuel Droplet ◽  
Test Rig ◽  
Acid Methyl ◽  
Better Than

The usage of biodiesel has been encouraged by government based on the issuance of The Regulation of Minister of Energy and Mineral Resources No. 12/2015 on the supply, utilization, and administration of biofuels as other alternative fuels. This regulation sets mandatory biodiesel mixture by 30 percent for national energy consumption by 2025. But the usage of biodiesel with a larger percentage in diesel engines still leaves some problems with the decline of biodiesel fuel quality and the formation of deposits in combustion chamber and injectors. The purpose of this study is to compare biodiesel fuel (B20) with Hydrotreated Biodiesel (HBD) in an experiment by using fuel droplet method on a plate to observe the characteristics and mechanism of deposit formation. Plates are heated in few temperature variations in a sealed test rig so that the conditions are similar to the engine real conditions. Deposit growth of Hydrotreated Biodiesel as known as Hydrotreated Vegetable Oil (HVO) less better than Fatty Acid Methyl Ester (FAME). It may occurred because the lubricity of HVO is very low due to the absence of sulfur and oxygen compounds in the fuel, that causes oxidation that can lead to deposits in the combustion chamber.

Preparation and Properties of Polysiloxane Modified Epoxy Encapsulating Material

2014 ◽  
Vol 1021 ◽  
pp. 3-6
Author(s):  
Hao Ran Zhou ◽  
Hong Xia Li ◽  
Wei Miao Yu
Keyword(s):  
Epoxy Resin ◽  
Raw Materials ◽  
Curing Agent ◽  
Reaction Conditions ◽  
The Poor ◽  
Fatigue Durability ◽  
Ft Ir ◽  
Shock Resistance ◽  
Modified Epoxy ◽  
Toughening Agent

In order to solve the poor toughness, fatigue durability and shock resistance defects of the cured epoxy resin, in this paper, the epoxy resin was modified via dichlorodiphenyl silane as a modifier. Then the electronic packaging materials were prepared using the modified EP as matrix, a nitrile rubber (CTBN) as a toughening agent, methyl nadic anhydride (MNA) as a curing agent, and 2, 4, 6 - tris (dimethyl amino methyl) phenol as a curing accelerator. The effects of raw materials ratio on the cured products’ properties was investigated. FT-IR, TG-DTG and DMA were used to test and characterize the product. And we determined the best raw materials ratio and reaction conditions. Finally epoxy encapsulating materials which have excellent mechanical properties, electrical properties were prepared.

scholarly journals POLYVINYL ALCOHOL/SILICA/CLAY COMPOSITES: EFFECT OF CLAY ON SURFACE MORPHOLOGY AND THERMO-MECHANICAL PROPERTIES

2015 ◽  
Vol 78 (1) ◽  
Author(s):  
Josephine Chang Hui Lai ◽  
Md. Rezaur Rahman ◽  
Sinin Hamdan
Keyword(s):  
Adsorption Isotherm ◽  
Polyvinyl Alcohol ◽  
Mineral Content ◽  
High Specific Surface Area ◽  
Solution Intercalation ◽  
X Ray ◽  
Stretching Vibration ◽  
Ft Ir ◽  
Thermal Stability Of ◽  
Better Than

A simplified route towards the synthesis of polyvinyl alcohol/silica/clay (PVA-SiO2-clay) composites was presented. PVA-SiO2-clay composites were prepared via solution intercalation method. All the composites were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), adsorption isotherm (BET), X-ray fluorescence (XRF), tensile test and Thermogravimetric Analysis (TGA). FTIR spectrum indicated that PVA-SiO2-clay composites especially clay (1.28E) loaded composites had much less transmittance percentage compared to pure PVA and others clay composites. The SEM revealed that the interfacial bonding between PVA-SiO2 and clay (1.28E) was much better than others clay loaded composites which was reflected in adsorption isotherm. The BET result also showed high specific surface area with low diameter of pore size of the composites. The thermal stability of PVA-SiO2-clay (1.28E) composites was the highest and it had higher activation energy due to the strong bonding between the trimethyl stearyl ammonium with both PVA-SiO2. The XRF result showed that clay (1.28E) loaded composites contained significant high percentage of Si which confirmed the presence of Si-O-Si stretching vibration while the high percentage of K proved the clay mineral content in the composite. Clay (1.28E) enhanced the tensile strength and modulus of PVA-SiO2-clay composites among all the composites. 

Multicomponent synthesis of polysubstituted γ-butyrolactones under Barbier-like conditions

2010 ◽  
Vol 83 (3) ◽  
pp. 621-631 ◽  
Author(s):  
Camille Le Floch ◽  
Erwan Le Gall ◽  
Eric Léonel
Keyword(s):  
Acid Methyl Ester ◽  
Conjugate Addition ◽  
Membered Ring ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
Acid Methyl ◽  
Aryl Bromides ◽  
The One ◽  
Dimethyl Itaconate

The one-pot, three-component synthesis of 2,3-di- and 2,2,3-trisubstituted-3-methoxycarbonyl-γ-butyrolactones starting from aryl bromides, dimethyl itaconate, and aldehydes or ketones is described. The cobalt-catalyzed domino process formally involves the in situ metallation of an aromatic bromide, a conjugate addition onto dimethyl itaconate, an aldolization reaction with a carbonyl compound, and a final cyclization into a five-membered ring lactone. This procedure is applied to the concise synthesis of a range of polyfunctionalized γ-butyrolactones displaying a paraconic acid methyl ester subunit.

A Simple and efficient Synthesis of 3,4-Dihydropyrimidin-2-Ones catalysed by Amidosulfonic Acid

2002 ◽  
Vol 2002 (1) ◽  
pp. 37-39 ◽  
Author(s):  
Tongshou Jin ◽  
Suling Zhang ◽  
Suyun Zhang ◽  
Junjie Guo ◽  
Tongshuang Li
Keyword(s):  
Biginelli Reaction ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
One Pot ◽  
The One ◽  
Better Than

A general and practical route for the synthesis of dihydropyrimidines by the one-pot cyclocondensation of aldehydes, β-ketoesters and urea is described using NH2SO3H as catalyst. Yields and selectivities are significantly better than under classical Biginelli reaction conditions.

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