The thermal degradation of μ-Diphenylacetylene-bis(tricarbonylcobalt)

1973 ◽  
Vol 26 (8) ◽  
pp. 1791 ◽  
Author(s):  
RS Dickson ◽  
LJ Michel
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Thermal Degradation ◽  
Organic Compounds ◽  
Degradation Mechanism ◽  
Scanning Calorimetry ◽  
Organic Products ◽  
Suitable Temperature ◽  
Degradation Reaction

The thermal decomposition of Co2(CO)6(PhC2Ph) has been investigated in detail. Differential scanning calorimetry was used to determine the most suitable temperature range for the study. At 180�, Co2(CO)6(PhC2Ph) decomposes to form cobalt, carbon monoxide, tetraphenylcyclopentadienone, hexaphenylbenzene, and other organic compounds. Variation in the temperature, the time, and the solvent used for the degradation reaction causes significant changes in the yields of the organic products. An investigation of the effects of adding stoichiometric amounts of free alkyne, tetra-phenylcyclopentadienone, and hexaphenylbenzene has been initiated in an attempt to understand the degradation mechanism.

scholarly journals Comparative thermal research on tetraazapentalene-derived heat-resistant energetic structures

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jing Zhou ◽  
Li Ding ◽  
Yong Zhu ◽  
Bozhou Wang ◽  
Xiangzhi Li ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Fourier Transform ◽  
Energetic Materials ◽  
Great Influence ◽  
Fourier Transform Infrared ◽  
Thermal Decomposition Mechanism ◽  
Scanning Calorimetry ◽  
In Situ Ftir Spectroscopy ◽  
Heat Resistant

AbstractOrganic inner salt structures are ideal backbones for heat-resistant energetic materials and systematic studies towards the thermal properties of energetic organic inner salt structures are crucial to their applications. Herein, we report a comparative thermal research of two energetic organic inner salts with different tetraazapentalene backbones. Detailed thermal decomposition behaviors and kinetics were investigated through differential scanning calorimetry and thermogravimetric analysis (DSC-TG) methods, showing that the thermal stability of the inner salts is higher than most of the traditional heat-resistant energetic materials. Further studies towards the thermal decomposition mechanism were carried out through condensed-phase thermolysis/Fourier-transform infrared (in-situ FTIR) spectroscopy and the combination of differential scanning calorimetry-thermogravimetry-mass spectrometry-Fourier-transform infrared spectroscopy (DSC-TG-MS-FTIR) techniques. The experiment and calculation results prove that the arrangement of the inner salt backbones has great influence on the thermal decompositions of the corresponding energetic materials. The weak N4-N5 bond in “y-” pattern tetraazapentalene backbone lead to early decomposition process and the “z-” pattern tetraazapentalene backbone exhibits more concentrated decomposition behaviors.

Synthesis, Characterization and Application of Multi-Generations Hyperbranched Polyurethane Based on Isophorone Diisocyanate

2012 ◽  
Vol 554-556 ◽  
pp. 126-129 ◽  
Author(s):  
Shun Yin ◽  
Ning Sun ◽  
Chun Yun Feng ◽  
Zhi Mou Wu ◽  
Zhao Hua Xu ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Raw Materials ◽  
Degradation Mechanism ◽  
Resonance Spectroscopy ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Isophorone Diisocyanate ◽  
Scanning Calorimetry ◽  
Degradation Temperature ◽  
Hyperbranched Polyurethane

A series of different generation hyperbranched polyurethane(HBPU) was synthesized based on the raw materials of isophorone diisocyanate(IPDI) and diethanolamine(DEOA). Their structure, thermal degradation mechanism and glass transition temperature(Tg) were characterized by fourier transform infrared spectroscopy(FTIR), nuclear magnetic resonance spectroscopy(NMR), thermal gravimetric analysis(TGA) and differential scanning calorimetry(DSC). The results showed that: the yield of each generation HBPU was up to 90%, different generation HBPU had almost the same initial degradation temperature(about at 200°C) and they all had two decomposition platforms; with the increase of generation, Tg increased from 107.2°C to 132.1°C. The gloss and hardness of the HBPU coatings were significantly improved.

scholarly journals A thermal degradation study of Y and La methanesulfonates

2006 ◽  
Vol 71 (8-9) ◽  
pp. 905-915
Author(s):  
Moura de ◽  
Jivaldo Matos ◽  
Farias de
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Differential Thermal Analysis ◽  
Thermal Degradation ◽  
Degradation Process ◽  
Oxide Formation ◽  
Scanning Calorimetry ◽  
Degradation Study ◽  
Thermogravimetric Data ◽  
Thermal Degradation Process

The synthesis, characterization and thermal degradation of yttrium and lanthanum methanesulfonates is reported. The prepared salts were characterized by elemental analysis and infrared spectroscopy. The thermal degradation study was performed using thermogravimetry (TG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC).Using the thermogravimetric data, a kinetic study of the dehydration ofY and Lamethanesulfonates was performed employing the Coats-Redfern and Zsak?methods. It was verified that under heating, yttrium and lanthanum methanesulfonates undergo three main processes: dehydration, thermal degradation and oxide formation. Furthermore, depending on the nature of the atmosphere, i.e., inert or oxidant, the thermal degradation process could be endothermic (N2) or exothermic (air).

scholarly journals Thermal stability and thermal decomposition of sucralose

2018 ◽  
Vol 39 (4) ◽  
pp. 21
Author(s):  
Gilbert Bannach ◽  
Rafael R. Almeida ◽  
Luis G. Lacerda ◽  
Egon Schnitzler ◽  
Massao Ionashiro
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Scanning Calorimetry ◽  
Thermoanalytical Techniques ◽  
Thermal Stability Of

Several papers have been described on the thermal stability of the sweetener, C12H19Cl3O8 (Sucralose). Nevertheless no study using thermoanalytical techniques was found in the literature. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC) and infrared spectroscopy, have been used to study the thermal stability and thermal decomposition of sweetener.

Influence of Cadmium Oxide on Thermal Hazard of AP-CMDB Propellants

2015 ◽  
Vol 1095 ◽  
pp. 419-422 ◽  
Author(s):  
Hao Nan Jia ◽  
Gui E Lu ◽  
Zhen Tao An ◽  
Jin Yong Jiang ◽  
Qiang Ge ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Decomposition Rate ◽  
Initial Temperature ◽  
Cadmium Oxide ◽  
Thermal Hazard ◽  
Test Results ◽  
Thermal Safety ◽  
Scanning Calorimetry ◽  
Two Stages

The influence of cadmium oxide on the thermal decomposition behaviors of AP-CMDB propellants was studied by differential scanning calorimetry (DSC) and accelerating rate calorimetry (ARC). The test results show that the decomposition process of AP-CMDB can be divided into two stages. Cadmium oxide can increase the initial temperature, slow down the decomposition rate and improve the thermal safety of AP-CMDB.

Engineering the crystallization behavior of an organic compound mixed with polymers using hidden liquid phase domains

2020 ◽  
Vol 5 (1) ◽  
pp. 177-185
Author(s):  
Gagan N. Kangovi ◽  
Sangwoo Lee
Keyword(s):  
Differential Scanning Calorimetry ◽  
Liquid Phase ◽  
Organic Compound ◽  
Organic Compounds ◽  
Crystallization Behavior ◽  
Scanning Calorimetry ◽  
Poly Ethylene

The crystallization behavior of pyrene mixed with polystyrene, poly(ethylene-alt-propylene) or poly(2-vinylpyridine) is investigated using the differential scanning calorimetry (DSC) technique to understand the effects of polymers on the crystallization of organic compounds.

Curing behaviors of cyanate ester/epoxy copolymers and their dielectric properties

2016 ◽  
Vol 29 (10) ◽  
pp. 1175-1184 ◽  
Author(s):  
Yangxue Lei ◽  
Mingzhen Xu ◽  
Mingli Jiang ◽  
Yumin Huang ◽  
Xiaobo Liu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Fourier Transform ◽  
Dielectric Properties ◽  
Small Extent ◽  
Dielectric Constants ◽  
Cyanate Ester ◽  
Scanning Calorimetry ◽  
Peak Fitting ◽  
Curing Kinetic

The curing behavior and dielectric properties of cyanate ester/epoxy (EP) with a latent initiator imidazole was investigated as a function of blend composition. Differential scanning calorimetry (DSC) was used to investigate the dynamic cure behavior of the blends. Multiheating rate DSC, peak fitting, and iso-conversion method were applied to analyze the curing kinetic parameters. Two distinct peaks were fitted from the dynamic DSC curve and the activation energies of each reaction varied with the increase of curing degrees. Fourier transform infrared spectra revealed that several reactions coexisted during the curing processes of cyanate and EP, resulting in the coexistence of the polymers and copolymers in the final composites. The dielectric properties of the composites were studied and the phenomenon that the dielectric constants for all of the composites are independent of frequency was observed. The thermal decomposition characteristics of the blends were investigated using thermogravimetric analysis. By increasing the content of EP, the thermal properties of the cured blends were improved to a small extent, while the char yield markedly decreased.

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