Thermal decomposition of formaldehyde at high temperatures

1985 ◽  
Vol 89 (14) ◽  
pp. 3109-3113 ◽  
Author(s):  
Ko Saito ◽  
Terumitsu Kakumoto ◽  
Yoshihiro Nakanishi ◽  
Akira Imamura
Keyword(s):  
Thermal Decomposition ◽  
High Temperatures

Experimental Studies and Thermodynamic Modeling of the Interaction of O2 with SiC

2002 ◽  
Vol 742 ◽  
Author(s):  
Y. Song ◽  
F. W. Smith
Keyword(s):  
Phase Diagram ◽  
Thermal Decomposition ◽  
High Temperatures ◽  
Thermodynamic Modeling ◽  
Surface Segregation ◽  
Experimental Studies ◽  
Temperature Phase ◽  
Temperature Phase Diagram

ABSTRACTWe report on experimental studies and thermodynamic modeling of the reaction of O2 with the 4H- and 6H-SiC surfaces at high temperatures. This reaction leads to the growth of passivating SiO2 layers at high O2 pressures, etching of the surfaces at lower pressures, and enhancements of the surface segregation of carbon at still lower pressures. A pressure-temperature phase diagram for the oxidation of SiC is presented. Evidence for the thermal decomposition of the SiO2 layer on SiC is also presented.

Thermal Analysis of Nomex® and Kevlar® Fibers

1977 ◽  
Vol 47 (1) ◽  
pp. 62-66 ◽  
Author(s):  
J. R. Brown ◽  
B. C. Ennis
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Glass Transition ◽  
Melting Point ◽  
Transition Region ◽  
High Temperatures ◽  
High Performance ◽  
Polymer Melt ◽  
Glass Transition Region ◽  
Dta Curves

DTA, TG, and TMA curves of commercial Kevlar® 49 and Nomex® fibers have been used to assess their behavior at high temperatures. The fibers lost absorbed water around 100°C, and a glass transition was reflected in the DTA and TMA curves in the region of 300°C. Difficulties in the interpretation of DTA and TMA curves in the glass-transition region and in the assignments of Tv‘s for these high-performance fibers are discussed. Whereas Kevlar 49 showed both a crystalline melting point (560°C) and a sharp endothermal thermal decomposition (590°C), Nomex showed only the latter (440°C) and no evidence of melting from the DTA curves. The endothermal decomposition peaks apparently correspond to “polymer melt temperatures” reported for related materials, and correlate well with the TG and TMA features. During thermal analysis of Kevlar 49, oxidation occurs more readily than thermal decomposition, but the latter predominates for Nomex. Differences between dyed and undyed Nomex were due to differences in yarn constitution.

The thermal decomposition of chrysotile

1977 ◽  
Vol 41 (320) ◽  
pp. 453-459 ◽  
Author(s):  
C. J. Martin
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Thermal Treatment ◽  
High Temperatures ◽  
Lattice Parameters ◽  
Atomic Arrangement ◽  
Observable Change ◽  
Infra Red ◽  
Magnesium Silicates

SummaryThe decomposition of chrysotile fibres heated in air has been studied in the range 100–1400°C by electron microscopy and infra-red absorption. The first observable change in the structure occurred at 580°C, where cavities started to open up between the (001) layers of chrysotile as the fibres were dehydrated, giving rise to strong low-angle diffraction. There was no evidence of any structure in the remaining material but some degree of the original atomic arrangement was preserved for the magnesium silicates, forsterite, and enstatite, later developed in certain preferred orientations. The manner of this crystallization was determined by the thermal treatment, for in samples held between 600°C and 800°C forsterite developed slowly with little further disruption of the fibre while above 800°C the remaining amorphous areas rapidly recrystallized to a mixture of forsterite and enstatite. It is suggested that the mechanisms described by other investigators to explain the development of forsterite in preferred orientations may serve simply to nucleate the crystallization and a similar mechanism to account for the nucleation of the enstatite crystallization is considered. At high temperatures a possible doubling of some of the lattice parameters of the silicates was observed.

scholarly journals Integration of MnO@graphene with graphene networks towards Li-ion battery anodes

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 96681-96684 ◽  
Author(s):  
Wei Guo ◽  
Xiu Li ◽  
Dickon H. L. Ng ◽  
Jianmin Ma
Keyword(s):  
Thermal Decomposition ◽  
High Temperatures ◽  
Cycling Performance ◽  
Argon Atmosphere ◽  
Li Ion Battery ◽  
Li Ion

We have directly integrated MnO@graphene with graphene networks through the thermal decomposition of Mn–oleate complex in an argon atmosphere at high temperatures. The MnO/graphene composites exhibited superior cycling performance.

Thermal decomposition of formic acid at high temperatures in shock waves

1982 ◽  
Vol 19 (1) ◽  
pp. 89-96 ◽  
Author(s):  
D.S.Y. Hsu ◽  
W.M. Shaub ◽  
Marlana Blackburn ◽  
M.C. Lin
Keyword(s):  
Thermal Decomposition ◽  
Shock Waves ◽  
Formic Acid ◽  
High Temperatures

Mechanism of thermal decomposition of dibenzhydryl oxalates

1967 ◽  
Vol 45 (24) ◽  
pp. 3035-3043 ◽  
Author(s):  
J. Warkentin ◽  
D. M. Singleton
Keyword(s):  
Thermal Decomposition ◽  
Transition State ◽  
High Temperatures ◽  
Diphenyl Ether ◽  
Isotope Effects ◽  
Slow Step ◽  
Radical Process ◽  
First Order ◽  
Mechanism Of Thermal Decomposition ◽  
O Isotope

Dibenzhydryl oxalate and several of its para-substituted analogs were thermally decomposed in diphenylmethane, diphenyl ether, and in α-chloronaphthalene solution. Evolution of gas (mainly CO2) was approximately first order, both rate and stoichiometry being poorly reproducible. Rates are correlated with σ+-substituent parameters, with ρ = −1.6 at 230.2°. The 13C/12C and 18O/16O isotope effects involved in CO2 formation were measured. It is concluded that thermolysis is a radical process with considerable polar character at the transition state and that the slow step involves concerted formation of one CO2 molecule, a diarylmethyl radical, and a carbodiarylmethoxy radical. The fate of the latter is primarily decarboxylation, but there is some decarbonylation and some trapping by diarylmethyl radicals. Tetraaryl ethane and CO2 are major products, the yield of the latter approaching 2 moles at high temperatures.

Thermal decomposition kinetics of ammonium perchlorate at high temperatures

1971 ◽  
Vol 4 (3) ◽  
pp. 169-175
Author(s):  
G. B. Manelis ◽  
A. V. Proshchin ◽  
Yu. I. Rubtsov ◽  
V. A. Strunin ◽  
A. S. Shteinberg
Keyword(s):  
Thermal Decomposition ◽  
Ammonium Perchlorate ◽  
High Temperatures ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Kinetics Of
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