A Study On The Thermal Decomposition of Ba(tmhd)2 and Sr(tmhd)2

1995 ◽  
Vol 415 ◽  
Author(s):  
Hyun-Kyu Ryu ◽  
Jae Hyun Han ◽  
Sang Heup Moon
Keyword(s):  
Mass Spectrometry ◽  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Metal Atom ◽  
Bond Energies ◽  
Partial Decomposition ◽  
Temperature Range ◽  
Long Period

ABSTRACTDecomposition of Sr(tmhd)2 and Ba(tmhd)2 was investigated by thermogravimetric analysis, in-situ FTIR, and mass spectrometry. Both compounds decomposed following 3 steps: 1) decomposition of the ligands, 2) simultaneous vaporization and partial decomposition of metal-organics, and 3) decomposition of the vaporized metal-organics which existed as the oligomeric species.The Sr source decomposed at lower temperatures and in a narrower temperature range than the Ba source. Also, the gaseous oligomeric species from the Sr source decomposed relatively quickly while the corresponding species from the Ba source decomposed slowly over a long period. Such a difference between the two compounds is due to different bond energies between the metal atom and the ligands, as indicated by our FTIR results.

scholarly journals Unexpected thermal decomposition behavior of poly(N-vinylimidazole)-l-poly(tetrahydrofuran) amphiphilic conetworks, a class of chemically forced blends

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 17413-17423 ◽  
Author(s):  
Csaba Fodor ◽  
János Bozi ◽  
Marianne Blazsó ◽  
Béla Iván
Keyword(s):  
Mass Spectrometry ◽  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Chemical Processes ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior

The underlying chemical processes of the unexpected thermal decomposition behavior of poly(N-vinylimidazole)-l-poly(tetrahydrofuran) amphiphilic conetworks were investigated by thermogravimetric analysis and thermogravimetry-mass spectrometry.

scholarly journals In situ polymerization of 4-(methacryloylamino) phenyl-2-methylacrylate on the surface of silicagel

2016 ◽  
Vol 4 (2) ◽  
pp. 47-54 ◽  
Author(s):  
Elina Yanovska ◽  
Lyudmyla Vretik ◽  
Dariusz Sternik ◽  
Olga Kychkiruk ◽  
Olena Nikolaeva ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Thermogravimetric Analysis ◽  
Ir Spectroscopy ◽  
Silica Gel ◽  
In Situ Polymerization ◽  
Alkaline Media ◽  
Adsorption Activity ◽  
Quantitative Characteristics

Immobilization of 4-(methacryloylamino)phenyl-2-methylacrylate homopolymer on the silica gel surface has been carried out in situ. The structure and quantitative characteristics of immobilized polymer have been examined by IR spectroscopy, thermogravimetric analysis and mass spectrometry. Adsorption activity towards microquantitatives of Pb(II), Cu (II), Mn(II), Co(II), Ni(II) and Fe(III) ions in the range of pH 6-8,5 has been observed. Quantitative adsorption of trace Pb(II) in neutral and slightly alkaline media has been reported.

In-situ X-ray powder diffraction studies of hydrothermal and thermal decomposition reactions of basic bismuth(iii) nitrates in the temperature range 20–650 °C

2003 ◽  
pp. 3278-3282 ◽  
Author(s):  
Axel Nørlund Christensen ◽  
Torben René Jensen ◽  
Nicola V. Y. Scarlett ◽  
Ian C. Madsen ◽  
Jonathan C. Hanson ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Powder Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Decomposition Reactions

Combustion Chemistry of Energetic Materials Studied by Probing Mass Spectrometry

1995 ◽  
Vol 418 ◽  
Author(s):  
O. P. Korobeinichev ◽  
L. V. Kuibida ◽  
A. A. Paletsky ◽  
A. G. Shmakov
Keyword(s):  
Mass Spectrometry ◽  
Thermal Decomposition ◽  
Energetic Materials ◽  
Molecular Beam ◽  
Flame Structure ◽  
Combustion Chemistry ◽  
Decomposition Products ◽  
Thermal Decomposition Products ◽  
Double Base

AbstractThe methods of probing mass spectrometry (PMS) for diagnostic of flames and for the study of kinetics and mechanism of the thermal decomposition products of energetic materials (EM) are described. Several types of instruments based on microprobe and molecular beam mass spectrometric sampling have been developed. Time of flight mass spectrometer has been used. Apparatuses for high (10 atm) and low (<1 atm) pressure have been developed for the study of combustion and decomposition of EM by PMS “in situ”. Several examples are presented to demonstrate application of PMS method for the study of EM flame structure, thermal decomposition and dynamic of ignition. Experimental data on decomposition of double base propellants ammonium dinitramide, ammonium perchlorate are presented.

scholarly journals Thermal stability of dialkylimidazolium tetrafluoroborate and hexafluorophosphate ionic liquids: ex situ bulk heating to complement in situ mass spectrometry

2018 ◽  
Vol 20 (24) ◽  
pp. 16786-16800 ◽  
Author(s):  
Coby J. Clarke ◽  
Simon Puttick ◽  
Thomas J. Sanderson ◽  
Alasdair W. Taylor ◽  
Richard A. Bourne ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Thermal Stability ◽  
Thermal Decomposition ◽  
Ionic Liquids ◽  
Ex Situ ◽  
Bulk Heating ◽  
Thermal Stability Of

Competition between vaporization and thermal decomposition of ionic liquids can be influenced by sample mounting during in situ measurements.

scholarly journals A Study of the Brönsted Site Acidity of Crystalline and Amorphous Aluminosilicates: 2. Thermal Decomposition of Grafted Acetyl Groups

1996 ◽  
Vol 14 (6) ◽  
pp. 359-362 ◽  
Author(s):  
V.V. Brei ◽  
A.V. Brichka
Keyword(s):  
Mass Spectrometry ◽  
Thermal Decomposition ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid Sites ◽  
Desorption Mass Spectrometry ◽  
Temperature Range ◽  
Aerosil Surface ◽  
Brönsted Acid ◽  
Brönsted Acid Sites

A study has been made by desorption mass spectrometry of the destruction of grafted acetyl groups on the surface of H-mordenite, H-ZSM-5, H-Y-faujasite, Al-containing aerosil and aluminosilicate compounds layered on an aerosil surface. It has been established that the thermal decomposition of acetyl groups attached through Brönsted acid sites proceeds with the formation of ketene over the same temperature range (320–360°C) for all the samples. The implications of this result for the strength of acid sites are discussed.

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