The Thermal Decomposition Behavior of Graphene Oxide/HMX Composites

2015 ◽  
Vol 645-646 ◽  
pp. 110-114 ◽  
Author(s):  
Gui Yu Zeng ◽  
Jian Hua Zhou ◽  
Cong Mei Lin
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Graphene Oxide ◽  
Interlayer Space ◽  
Decomposition Process ◽  
Thermal Decomposition Process ◽  
Hummers Method ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior ◽  
Decomposition Activation Energy

Graphene oxide (GO) was prepared by Hummers method and GO/1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) composite was prepared via an ultrasonic compounding method. The structure of GO was characterized using XRD and SEM, the thermal decomposition of HMX and GO/HMX composite was analyzed by DSC/TG test. The results show that interlayer space of GO increases markedly, the thermal decomposition process of HMX can be promoted with the nanolayer structure of GO, resulting the reduced thermal decomposition activation energy of about 50 kJ/mol with 1% GO.

Processing and properties of high-purity micro-lamellate (NH4)2RuCl6 particles

2018 ◽  
Vol 7 (1) ◽  
pp. 16-22
Author(s):  
Zena Xin ◽  
Panchao Zhao ◽  
Jialin Chen ◽  
Yaohong Ma ◽  
Ying Xu ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
High Purity ◽  
Solid Phase ◽  
Decomposition Process ◽  
X Ray Diffraction ◽  
Thermal Decomposition Process ◽  
X Ray ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior ◽  
Two Stages

Abstract(NH4)2RuCl6is an important precursor in the synthesis of Ru powder with high-purity requirement. In this study, high-purity (>99.999 wt%) micro-sized (NH4)2RuCl6pieces were synthesized by distillation and precipitation from crude Ru powder. Then, the thermal decomposition behavior of the (NH4)2RuCl6pieces was investigated. The decomposition process included two stages. First, (NH4)2RuCl6was decomposed from 255.0°C to 314.0°C, with the endothermic peak located at 309.4°C. At this stage, HCl and NH3were released, while the dense micro-pieces were transformed to loosened micro-pieces due to the thermal decomposition. Then, the solid phase [(NH3)4Ru3Cl12] kept decomposing from 314.0°C to 352.7°C, HCl and N2were released, and agglomerated Ru particles were achieved. Thermogravimetric analysis-differential thermal analysis-mass spectrum coupling (TG-DTA-MS) was used to monitor the thermal decomposition process and identify the released gaseous phases, respectively. The solid phases in different stages were characterized by high-temperature X-ray diffraction (HTXRD). A good understanding of the processing and thermal decomposition of (NH4)2RuCl6is crucial in the creation of Ru products.

scholarly journals Study on Blending of Wall Material of the Nonel Tube by CSW/PE-g-MAH

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Hong-wei Li ◽  
Bin-bin Zhang ◽  
Ji-nian Yang ◽  
Huan Li ◽  
Ji-chang Gui ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Composite System ◽  
Interfacial Structure ◽  
Wall Material ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior ◽  
Calcium Sulfate Whiskers ◽  
Melting And Crystallization ◽  
Decomposition Activation Energy

In order to improve the strength and resistance of ordinary nonel tubes, calcium sulfate whiskers (CSW, treated with silane coupling agent) and maleic anhydride grafted polyethylene (PE-g-MAH) are used to control the wall material of the nonel tube that the blending of the low-density polyethylene was enhanced. The effects of mass fraction of CSW or PE-g-MAH on the tensile properties, interfacial structure, melting and crystallization characteristics, and thermal decomposition behavior of the composite system were studied, and the thermal decomposition kinetics were calculated. The results show that, relative to pure LDPE, the strength of LDPE/CSW (85/15) is increased by 7.58%, and the strength of LDPE/CSW/PE-g-MAH (84/15/1) is increased by 7.58%. The addition of CSW or PE-g-MAH has gradually changed the fracture mode of the LDPE matrix. Thermal analysis shows that CSW can reduce the crystallinity of LDPE. The melting and crystallization characteristics of LDPE/CSW/PE-g-MAH composites have little effect, but the thermal decomposition stability is improved. The kinetic analysis showed that the reaction order (n) was around 1, CSW could improve LDPE/CSW thermal decomposition activation energy, and PE-g-MAH increased the thermal decomposition activation energy of LDPE/CSW/PE-g-MAH.

scholarly journals Thermal Decomposition Behavior of 3D Printing Filaments Made of Wood-filled Polylactic Acid (PLA)/Starch Blend

2020 ◽  
Author(s):  
Yufeng Sun ◽  
Danbee Lee ◽  
Yapeng Wang ◽  
Suiliang Li ◽  
Jilai Ying ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
3D Printing ◽  
Polylactic Acid ◽  
Starch Content ◽  
Wood Composites ◽  
Thermal Decomposition Process ◽  
Method Of Calculation ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior ◽  
Degradation Degree

Dynamic thermogravimetric (TG) analysis under nitrogen environment was used to understand the thermal decomposition process of 3D printing filaments made of wood-filled polylactic acid (PLA)/starch blend. The characteristic temperatures and apparent activation energy (AAE) of the filaments with various starch contents were calculated with well-known kinetic models by Friedman, Flynn-Wall-Ozawa, Coats-Redfern and Kissinger. With the increased starch content in the filament, the onset thermal decomposition temperatures of the filaments decreased gradually from 272.4 to 155.1°C. The thermal degradation degree became smaller, and the transitional temperature interval became larger with increased starch proportion. The AAE values of the three types of filaments with different starch ratios varied between 97 kJ/mol and 114 kJ/mol, depending on material composition and method of calculation. The improved understanding of thermal decomposition behavior of PLA-starch-wood composites can help develop more biodegradable PLA/starch-based filaments for 3D printing.

scholarly journals Thermal Decomposition Behavior of Melaminium Benzoate Dihydrate

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
N. Kanagathara ◽  
M. K. Marchewka ◽  
K. Pawlus ◽  
S. Gunasekaran ◽  
G. Anbalagan
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Effective Activation Energy ◽  
Preexponential Factor ◽  
Effective Activation ◽  
Heating Rates ◽  
Monoclinic System ◽  
Model Free ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior

Crystals of melaminium benzoate dihydrate (MBDH) have been grown from aqueous solution by slow solvent evaporation method at room temperature. Powder X-ray diffraction analysis confirms that MBDH crystallizes in the monoclinic system (C2/c). Thermal decomposition behavior of MBDH has been studied by thermogravimetric analysis at three different heating rates: 10, 15, and 20°C/min. Nonisothermal studies of MBDH revealed that the decomposition occurs in three stages. The values of effective activation energy (Ea) and preexponential factor (ln A) of each stage of thermal decomposition for all heating rates were calculated by model free methods: Arrhenius, Flynn-Wall, Friedman, Kissinger, and Kim-Park methods. A significant variation of effective activation energy (Ea) with conversion (α) indicates that the process is kinetically complex. The linear relationship between the A and Ea values was established (compensation effect). Avrami-Erofeev model (A3), contracting cylinder (R2), and Avrami-Erofeev model (A4) were accepted by stages I, II, and III, respectively. DSC has also been performed.

Thermal Decomposition of Phosphate Ore by Using Differential Scanning Calorimetric Method

2014 ◽  
Vol 887-888 ◽  
pp. 1005-1009
Author(s):  
Lin Zhuan Ma ◽  
Chao Huang ◽  
Jun Ming Guo ◽  
Zhi Ying Wang
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Weight Loss ◽  
Loss Rate ◽  
Decomposition Process ◽  
Differential Scanning Calorimetric ◽  
Heating Rates ◽  
Thermal Decomposition Process ◽  
Phosphate Ore ◽  
Dsc Curves

Phosphate ore was decomposed by using thermogravimetric (TG) and differential scanning calorimetric (DSC). The TG-DSC curves contained different sizes and heating rates. The results showed that phosphate ore had four weight loss stages at the range of 40 ~ 1100°C. With the particle size decreasing, the third weight loss stage became more obvious in TG curves and the endothermic peak became sharper in DSC curve ; the starting and ending temperature of thermal decomposition process moved to higher,the weight loss rate also tended to increase; the activation energy of phosphate ore endothermic decomposition process was calculated by Owaza method in 600~800°C, the average activation energy was 202.80 kJ / mol. It provided a basis for the utilizing of phosphate ore.

scholarly journals Thermal Decomposition of the HXeCl···H2O Complex in Solid Xenon: Experimental Characterization of the Two-body Decomposition Channel

2019 ◽  
Author(s):  
Masashi Tsuge ◽  
Markku Räsänen ◽  
Leonid Khriachtchev
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Water Molecule ◽  
Decomposition Product ◽  
Decomposition Process ◽  
Experimental Characterization ◽  
Thermal Decomposition Product ◽  
Thermal Decomposition Process ◽  
Theoretical Predictions

The thermal decomposition process of HXeCl···H2O in solid Xe is studied, and HCl···H2O is identified as a decomposition product. The production is due to the two-body (2B) decomposition of HXeCl moiety, in agreement with theoretical predictions. Two types of 2B decomposition paths are predicted: catalytic and unimolecular 2B decompositions, where water molecule plays different roles. In an experiment to selectively produce HXeCl···D2O, only HCl···D2O is observed as a thermal decomposition product, indicating the occurrence of unimolecular 2B decomposition, where water molecule serves as a spectator. The activation energy for this decomposition process is experimentally determined to be 15 kJ mol−1.<br>

scholarly journals Optimized energetic HNTO/AN co-crystal and its thermal decomposition kinetics in the presence of energetic coordination nanomaterials based on functionalized graphene oxide and cobalt

RSC Advances ◽  
2021 ◽  
Vol 11 (56) ◽  
pp. 35287-35299
Author(s):  
Sabrina Hanafi ◽  
Djalal Trache ◽  
Abderrahmane Mezroua ◽  
Hani Boukeciat ◽  
Redha Meziani ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Graphene Oxide ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior

A new co-crystal based on AN and HNTO has been developed and its thermal decomposition behavior through the incorporation of energetic coordination nanomaterials based on functionalized graphene oxide and cobalt has been elucidated.

scholarly journals Study of GaN-Based Thermal Decomposition in Hydrogen Atmospheres for Substrate-Reclamation Processing

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2082
Author(s):  
Shih-Yung Huang ◽  
Jian-Cheng Lin ◽  
Sin-Liang Ou
Keyword(s):  
Thermal Decomposition ◽  
Decomposition Reaction ◽  
Hydrogen Atmosphere ◽  
Thermal Decomposition Process ◽  
Hydrogen Flow ◽  
Thermal Decomposition Behavior ◽  
Transmission Electron ◽  
Furnace Tube ◽  
Decomposition Behavior ◽  
Patterned Sapphire Substrates

This study investigates the thermal decomposition behavior of GaN-based epilayers on patterned sapphire substrates (GaN-epi/PSSs) in a quartz furnace tube under a hydrogen atmosphere. The GaN-epi/PSS was decomposed under different hydrogen flow rates at 1200 °C, confirming that the hydrogen flow rate influences the decomposition reaction of the GaN-based epilayer. The GaN was completely removed and the thermal decomposition process yielded gallium oxyhydroxide (GaO2H) nanostructures. When observed by transmission electron microscopy (TEM), the GaO2H nanostructures appeared as aggregates of many nanograins sized 2–5 nm. The orientation relationship, microstructure, and formation mechanism of the GaO2H nanostructures were also investigated.

scholarly journals The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Jia-xing Song ◽  
Tao Guo ◽  
Wen Ding ◽  
Miao Yao ◽  
Li Yang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermal Behavior ◽  
Exothermic Reaction ◽  
Exothermic Peak ◽  
Decomposition Process ◽  
Particle Sizes ◽  
Ultrasonic Dispersion ◽  
Thermal Decomposition Process ◽  
Al Powder

Micron-MnO2 powder has unique thermal decomposition process compared with other metal oxides, and the different characteristics of components in thermite could affect the thermal performance of the whole system directly. In this work, the Al powder with different three particle sizes was combined with micron-MnO2 to prepare the Al-MnO2 thermite system, and the effect of Al powder particle sizes on the whole thermal behavior was studied. Firstly, the thermal decomposition process of micron-MnO2 and purity of Al powder are tested by TG-DSC. By using ultrasonic dispersion method, the fuel-rich thermite samples were prepared and characterized by SEM and TG-DSC at different heating rates. The Kissinger method was also employed to calculate the activation energy for the first exothermic peak. It was found that the thermal decomposition process of MnO2 in the thermite system can be significantly disturbed by different Al particles size. In other words, the effect of Al particle sizes on the thermite can be magnified due to the unique decomposition properties of micron-MnO2 instead of onset temperature of exothermic reaction changing simply. The activation energy of thermite system decreased with the reduction of Al particle sizes in micron-level, while in nanolevel the activation energy markedly increased. Finally, the possible reasons for phenomenon were discussed.

scholarly journals Thermal Decomposition of the HXeCl···H2O Complex in Solid Xenon: Experimental Characterization of the Two-body Decomposition Channel

2019 ◽  
Author(s):  
Masashi Tsuge ◽  
Markku Räsänen ◽  
Leonid Khriachtchev
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Water Molecule ◽  
Decomposition Product ◽  
Decomposition Process ◽  
Experimental Characterization ◽  
Thermal Decomposition Product ◽  
Thermal Decomposition Process ◽  
Theoretical Predictions

The thermal decomposition process of HXeCl···H2O in solid Xe is studied, and HCl···H2O is identified as a decomposition product. The production is due to the two-body (2B) decomposition of HXeCl moiety, in agreement with theoretical predictions. Two types of 2B decomposition paths are predicted: catalytic and unimolecular 2B decompositions, where water molecule plays different roles. In an experiment to selectively produce HXeCl···D2O, only HCl···D2O is observed as a thermal decomposition product, indicating the occurrence of unimolecular 2B decomposition, where water molecule serves as a spectator. The activation energy for this decomposition process is experimentally determined to be 15 kJ mol−1.<br>

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