Diazo-Transfer Reagent 2-Azido-4,6-dimethoxy-1,3,5-triazine Displays Highly Exothermic Decomposition Comparable to Tosyl Azide

2019 ◽  
Vol 84 (9) ◽  
pp. 5893-5898 ◽  
Author(s):  
Sebastian P. Green ◽  
Andrew D. Payne ◽  
Katherine M. Wheelhouse ◽  
Jason P. Hallett ◽  
Philip W. Miller ◽  
...  
Keyword(s):  
Exothermic Decomposition

Ability of Naphthoquinondiazide Photoresists to Exothermic Decomposition

2020 ◽  
pp. 90-96
Author(s):  
A.N. Shushpanov ◽  
◽  
A.Ya. Vasin ◽  
V.M. Raykova ◽  
G.G. Gadzhiev ◽  
...  
Keyword(s):  
Convective Heat Exchange ◽  
Inert Atmosphere ◽  
Necessary Condition ◽  
Critical Temperatures ◽  
Good Convergence ◽  
Measuring Devices ◽  
Explosive Transformation ◽  
Exothermic Decomposition ◽  
Experimental Approaches ◽  
Experimental Values

The article considers two intermediate products of positive photoresists (1,2-naphthoquinonediazide-(2)-5-sulfonic acid of monosodium salt — Dye M and 1,2-naphthoquinonediazide-(2)-5-sulfochloride — Dye N2) from the standpoint of the tendency to explosive transformation. The experimental values of flash points determined on the OTP setup were 130 °C for Dye M and 95 °C for Dye N2. These values are close to the temperatures of the beginning of intensive exothermic decomposition (132 and 111 °C, respectively) obtained by thermogravimetric analysis. In addition, this analysis showed the presence of exothermic peaks in the studied samples both in the air and in an inert atmosphere of helium, which is a necessary condition for the manifestation of a tendency to explosive transformation. To confirm the possibility of explosive transformation, the flash points of substances were also determined by the calculation method according to the formula, which is a consequence of the problem of thermal explosion during convective heat exchange with the environment, and gave a result close to the experimental one (the values were 138 and 105 °C, respectively). For this calculation the following was used: the kinetic parameters determined by the Kissinger method, the values of the density of substances determined on an automatic pycnometer, as well as the values of the heat of explosive transformation obtained with the help of the Real computer thermodynamic program. The research results confirming the tendency of the investigated compounds to explosive transformation, as well as the critical temperatures, exceeding which is unacceptable, were transferred to the production of FGUP GNTs NIOPIK to create a safe technological process, safe storage and transportation conditions. Considering the accuracy of the measuring devices, the process temperature should not exceed 125 °C for Dye M and 90 °C for Dye N2. The conducted studies and calculations show that the computational and experimental approaches have good convergence, give values in a close temperature range, and increase the reliability of the obtained results.

Electrospun PMMA/AB nanofiber composites for hydrogen storage applications

e-Polymers ◽  
2014 ◽  
Vol 14 (5) ◽  
pp. 305-311 ◽  
Author(s):  
Javad Alipour ◽  
Ahmad Mousavi Shoushtari ◽  
Ali Kaflou
Keyword(s):  
Hydrogen Storage ◽  
Composite Structures ◽  
Exothermic Reaction ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Nanofiber Composite ◽  
Practical Solution ◽  
Volatile Products ◽  
Exothermic Decomposition ◽  
By Products

AbstractIn this work, poly(methyl methacrylate) (PMMA)/ammonia borane (AB) nanofiber composites were fabricated and the synergetic nanoconfinement effect of nanofibers on dehydrogenation temperature and the removal of unwanted by-products of AB (NH3 BH3) were studied. The results of the dehydrogenation of PMMA/AB samples showed an exothermic reaction temperature of 112°C, which is significantly lower than that of pure AB (120°C). Furthermore, the interaction between AB molecules and PMMA nanofiber structures decreased the enthalpy of exothermic decomposition, from -21.00 to -10.66 kJ/mol H2, suggesting that this type of AB nanofiber composite can provide a convenient reversible hydrogen storage material. Based on the thermogravimetric analysis curves, the use of PMMA to support AB in composite structures resulted in a decrease in AB weight loss from 60.00 to 11.10 wt.% which, in turn, could vigorously reduce the emission of by-product impurities. Based on the obtained results, the strategy of supporting AB in nanofiber structures can be presented as a practical solution to maintain lower operational temperatures and to reduce undesirable volatile products in the dehydrogenation process of AB.

Kinetics of the Exothermic Decomposition Reaction of N-Methyl-N-nitro-2,2,2-trinitroethanamine

2010 ◽  
Vol 21 (11) ◽  
pp. 1419-1421 ◽  
Author(s):  
San-Ping Chen ◽  
Rong-Zu Hu ◽  
Ji-Rong Song ◽  
De-Suo Yang ◽  
Sheng-Li Gao ◽  
...  
Keyword(s):  
Decomposition Reaction ◽  
Exothermic Decomposition ◽  
Kinetics Of

scholarly journals Cu2[Cu(H2O)4][(CH2)4(NH3)2][C6H2(COO)4]2·4H2O — A Three-Dimensional Coordination Polymer with Negativ Excess Charge and Channel-like Voids

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Aqueous Solution ◽  
Coordination Polymer ◽  
Single Crystals ◽  
Three Dimensional ◽  
Excess Charge ◽  
Ferromagnetic Coupling ◽  
Space Group ◽  
Exothermic Decomposition ◽  
Thermoanalytical Measurements

Triclinic single crystals of Cu2[Cu(H2O)4][(CH2)4(NH3)2][C6H2(COO)4]2·4H2O have beenprepared in aqueous solution at 55 °C. Space group P-1 (no. 2), a = 799.73(7), b = 977.43(8),c = 1086.27(9) pm, α = 87.194(7), β = 84.679(7), γ = 74.744(6)°, V = 0.81540(12) nm3, Z = 1.There are two unique Cu2+ with CN 4+1 (Cu(1)) and CN 4+2 (Cu(2)), respectively. The Cu-Odistances range from 197.4(2) to 214.9(2) pm (Cu(1)) and 191.6(2) to 240.1(4) pm (Cu(2)).There is a short Cu(1)-Cu(1) contact of 267.02(6) pm. A three-dimensional coordinationpolymer with negative excess charge and channel-like voids extending parallel to [-110] ismade up by Cu2+ and [C6H2(COO)4]4-. These voids accomodate [(CH2)4(NH3)2]2+ and watermolecules, which are not coordinated to Cu2+. Thermoanalytical measurements in airindicated a step-wise loss of water of crystallization commencing at 63 °C, which is finishedat approx. 250 °C followed by an exothermic decomposition yielding CuO. The Cu(1) pairsshow anti-ferromagnetic coupling.

Structure and Growth of N2O Gate Oxynitrides

1996 ◽  
Vol 428 ◽  
Author(s):  
K. A. Ellis ◽  
E. C. Carr ◽  
R. A. Buhrman
Keyword(s):  
Flow Rate ◽  
Atomic Oxygen ◽  
Gate Dielectrics ◽  
Total Concentration ◽  
Nitrogen Sources ◽  
Interface State ◽  
Silicon Oxynitride ◽  
Nitrogen Incorporation ◽  
Exothermic Decomposition ◽  
State Generation

AbstractA series of investigations have been conducted into the properties of N2O silicon oxynitride gate dielectrics, and the various methods of their growth. One of the principle advantages of these oxides is their resistance to interface state generation. This is linked to the presense of nitrogen near the substrate interface, where it is triply bonded to silicon. It is also demonstrated that during N2O-based furnace growth, the total concentration of NOx species varies strongly with the flow rate of N2O. This has been correlated to the temperature profile of the furnace, which can be affected by the exothermic decomposition of N2O. This property has been exploited to controllably adjust the rate of nitrogen incorporation by up to a factor of three. Although nitrogen incorporation during furnace processing is generally stable, it is shown that atomic oxygen is capable of removing previously incorporated nitrogen. Sources of atomic oxygen include the decomposition of N2O during RTP treatment, N2O processing in a high flow rate furnace, or from ozone annealing.

Time-Resolved Studies of Surface Melting During Laser-Induced Chemical Vapor Deposition with Laser Intensity Modulation

1989 ◽  
Vol 158 ◽  
Author(s):  
Paul B. Comita ◽  
Peter E. Price ◽  
Toivo T. Kodas
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Laser Intensity ◽  
Chemical Vapor ◽  
Surface Melting ◽  
Gold Deposits ◽  
Laser Source ◽  
Time Resolved ◽  
Exothermic Decomposition ◽  
Reflectance Measurements

ABSTRACTThermal laser-induced chemical vapor deposition of gold deposits has been studied using a modulated Ar+ laser. Deposition of gold from dimethylgold hexafluoroacetylacetonate is accompanied by surface melting of the deposit when laser source is modulated. Time-resolved reflectance measurements have been used to study the surface reflectance during growth with modulated and unmodulated laser source. The reflectance measurements indicated that surface melting does not occur under unmodulated cw irradiation at equivalent laser intensities. Variation in the modulation duty cycle indicates that there is a minimum laser-off cycle time length required for surface melting to be observed. Evidence is presented which suggests that surface melting is due to the heat released by the exothermic decomposition of reactant adsorbed during the time that the laser intensity is off.

Sign in / Sign up

Export Citation Format

Share Document