Thermal Reaction of Silane with Acetylene and The Thermal Decomposition of Ethynylsilane

1984 ◽  
Vol 32 ◽  
Author(s):  
M. A. Ring ◽  
H. E. O'Neal ◽  
J. W. Erwin ◽  
D. S. Rogers
Keyword(s):  
Thermal Decomposition ◽  
Product Yield ◽  
Thermal Reaction ◽  
Yield Curves ◽  
Silyl Radicals ◽  
Volatile Products ◽  
Rule Out

The volatile products from the thermal reaction (414°C) of silane in excess acetylene are hydrogen, ethylene, vinylsilane, ethynylsilane, vinylethynylsilane (possibly divinylsilane) and ethynyl-divinylsilane (1,2). We have reexamined this reaction using a 3 C2 H2/1 SiH4 reaction mixture and have obtained product yield curves for these products versus percent silane loss. We have also found that product curves are unaffected when propylene at pressures equal to that of acetylene is also present. Since only trace quantities of propylsilane are produced in the presence of propylene, we can rule out reactions involving silyl radicals. Thus the SiH4−C2H2 reaction involves silylene and silene intermediates. The products can be explained by a mechanism similar to one proposed by Barton and Burns (3).

scholarly journals Thermal Decomposition and Thermal Reaction Process of PTFE/Al/MnO2 Fluorinated Thermite

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2451 ◽  
Author(s):  
Jun Zhang ◽  
Junyi Huang ◽  
Xiang Fang ◽  
Yuchun Li ◽  
Zhongshen Yu ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Control Systems ◽  
Thermal Reaction ◽  
Reaction Process ◽  
Reaction Products ◽  
Subsequent Reaction ◽  
Comparison Results ◽  
Different Temperatures ◽  
Xrd Phase Analysis ◽  
Two Stages

To better understand the thermal decomposition and reaction process of a fluorine-containing powdery thermite, PTFE/Al/MnO2, reactions at different temperatures were investigated by the TG/DSC-MS technique. The corresponding reaction products were characterized with XRD phase analysis. Another three thermite materials, i.e., PTFE/Al, Al/MnO2, and PTFE/MnO2, were also prepared for comparison. Results showed that PTFE behaved as both oxidizer and reducer in PTFE/Al/MnO2 fluorinated thermite. The thermal decomposition and reaction process of as-fabricated ternary thermite could be divided into two stages—the mutual reaction between each of PTFE, Al, and MnO2 and the subsequent reaction produced between Al and Mn2O3/Mn3O4/MnF2. Compared with the three control systems, the specially designed ternary system possessed a shorter reaction time, a faster energy release rate, and a better heat release performance.

Volatile Products Formed in the Thermal Decomposition of a Tobacco Substrate

2013 ◽  
Vol 52 (42) ◽  
pp. 14984-14997 ◽  
Author(s):  
Federica Barontini ◽  
Alessandro Tugnoli ◽  
Valerio Cozzani ◽  
John Tetteh ◽  
Marine Jarriault ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Volatile Products

Reaction of methyl azidoformate with norbornene

1969 ◽  
Vol 47 (23) ◽  
pp. 4367-4374 ◽  
Author(s):  
A. C. Oehlschlager ◽  
R. S. McDaniel ◽  
A. Thakore ◽  
P. Tillman ◽  
L. H. Zalkow
Keyword(s):  
Thermal Decomposition ◽  
Bond Cleavage ◽  
Thermal Reaction ◽  
Dipolar Cycloaddition ◽  
Carbon Bond ◽  
Heterolytic Cleavage ◽  
Carbon Carbon Bond ◽  
Step Mechanism

The thermal reaction of methyl azidoformate and norbornene has been found to proceed via 1,3-dipolar-cycloaddition yielding exo triazoline adduct, 15a. Thermal decomposition of the triazoline results in the loss of nitrogen and the formation of at least 5 products. The major products of the thermal decomposition in decalin were 3-carbomethoxy-3-azatricyclo(3.2.1.02,4 exo)octane, 18a, and N-carbomethoxy-2-norbornimine, 20. In addition, syn-2-norbornene-7-methyl carbamate, 21, and 3-carbomethoxy-3-azatricyclo(3.2.1.02,3 endo)octane, 19a, were isolated. The thermal decomposition of the triazoline adduct is considered to proceed by a multi-step mechanism. The first step is considered to involve heterolytic cleavage of the N3—N4 bond togive a zwitterion which may lead to products or rearrange via carbon–carbon bond cleavage to give a diazoalkyl imine.

scholarly journals Property of upgraded solid and liquid products from Baganuur lignite by thermal reaction with solvent

2018 ◽  
pp. 39-47
Author(s):  
Ariunaa A ◽  
Otgonchuluun D ◽  
Purevsuren B ◽  
Davaajav Ya
Keyword(s):  
Thermal Decomposition ◽  
Liquid Product ◽  
Thermal Reaction ◽  
Low Rank ◽  
Spectrometric Analysis ◽  
Ftir Analysis ◽  
Constant Mass ◽  
Mass Ratio ◽  
Organic Mass ◽  
Liquid Products

The coal of Baganuur deposit have been investigated to determine its technical characteristics, elemental and petrographical maceral compositions. On the basis of proximate, ultimate, petrographic and FTIR analysis, the obtained results have confirmed that the Baganuur coal is a low rank lignite B2 mark. The liquid tar, produced through thermolysis of Baganuur coal, was investigated by FTIR, 13C and 1H NMR spectrometric analysis. The results of thermolysis of Baganuur coal in tetralin has a constant mass ratio between coal and tetralin (1:1.8) at 450°C, which shows that 40.0% of liquid product can be obtained after thermal decomposition of the coal organic mass.

Investigation on the thermal decomposition and thermal reaction process of PTFE/Al/MoO3 fluorine-containing thermite

2021 ◽  
Vol 241 ◽  
pp. 109676
Author(s):  
Jiaxiang Wu ◽  
Bin Feng ◽  
Zhenru Gao ◽  
Yuchun Li ◽  
Shuangzhang Wu ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Thermal Reaction ◽  
Reaction Process

THE THERMAL DECOMPOSITION OF STYRENE–BUTADIENE POPCORN POLYMER

1950 ◽  
Vol 28b (1) ◽  
pp. 5-16
Author(s):  
C. A. Winkler ◽  
J. Halpern
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Linear Relation ◽  
Frequency Factor ◽  
Thermal Reaction ◽  
Cross Linking ◽  
First Order ◽  
Bond Scission ◽  
Styrene Butadiene ◽  
Kinetics Of

At temperatures of the order of 250 °C., popcorn polymer undergoes decomposition to soluble polymer. The reaction is catalyzed by peroxides present in the popcorn when the latter is formed. These peroxides may be removed by extracting the polymer with benzene. The kinetics of both the catalyzed and purely thermal solubilization reactions were investigated. The rates of both reactions are first order, the catalyzed degradation having a higher activation energy and a higher frequency factor. The rate of the thermal reaction decreases and its activation energy increases with increasing butadiene content of the polymer. A linear relation between the activation energy and the log of the frequency factor, for the decomposition of popcorn polymers of different butadiene contents, was observed. The results indicate that the rate of solubilization is determined by the activation energy of the bond scission process, and is independent of the degree of cross-linking of the polymer.

THE THERMAL DECOMPOSITION OF CARBOHYDRATES

1948 ◽  
Vol 26b (4) ◽  
pp. 415-431 ◽  
Author(s):  
I. E. Puddington
Keyword(s):  
Carbon Dioxide ◽  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Reaction Temperature ◽  
Potato Starch ◽  
Second Step ◽  
Volatile Solids ◽  
Volatile Products ◽  
Separate Step ◽  
Rapid Reaction

The thermal decompositions of cellobiose, maltose, dextrose, and potato starch have been studied over a temperature range, by following the production of volatile products. Carbon dioxide, carbon monoxide, and water with small quantities of acids, aldehydes, and volatile solids were produced in all cases. With cellobiose, the first step of the reaction, which involved the elimination of two moles of water per mole of sugar, could be separated from the second step, where the oxides of carbon were produced, by controlling the reaction temperature. Dextrose first dimerized by a rapid reaction and then decomposed in much the same manner as cellobiose. The behavior of maltose was anomalous and no dehydration by a separate step could be detected. The decomposition of potato starch was similar to the second step of the cellobiose reaction.

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