Condensed-phase kinetics of cyclotetramethylenetetranitramine from confined rapid thermolysis/FTIR spectroscopy

1997 ◽  
Author(s):  
E. Kim ◽  
S. Thynell ◽  
E. Kim ◽  
S. Thynell
Keyword(s):  
Ftir Spectroscopy ◽  
Condensed Phase ◽  
Kinetics Of

The photochemistry of RDX in solid argon at 10 K

1991 ◽  
Vol 69 (10) ◽  
pp. 1535-1538 ◽  
Author(s):  
Jeff Alix ◽  
Susan Collins
Keyword(s):  
Ftir Spectroscopy ◽  
Key Words ◽  
Gas Phase ◽  
Condensed Phase ◽  
Thermal Reactions ◽  
The Matrix ◽  
Intermolecular Reactions ◽  
Argon Matrices ◽  
Solid Argon ◽  
Kinetics Of

The photochemistry of RDX was studied in argon matrices at 10 K and examined by FTIR spectroscopy. The spectra and kinetics of product growth indicate that there are two decomposition pathways: [I]        RDX → 4NO + 2CH2O + N2 + CH2 → 4NO + 2CO + N2 +CH4 + H2 [II]        RDX → N2O + [O3 + N2] or [N2O3] + CO2 + C2H2 +N2 + 2H2 The mechanism II nitrogen products can easily be rationalized for the chair configuration of RDX with axial NO2 groups adjacent (Cs symmetry). When considering the carbon products of II, it may be necessary to postulate intermolecular reactions. Our studies gave no evidence for the symmetric triple fission path, which leads to N2O and CH2O, nor for the NO2 stripping mechanism reported for the gas-phase thermal reactions, which leads to the formation of NO2 and HCN. Rather, our findings were more consistent with the known condensed phase products. The production of CH4, C2H2, N2O3, and O3 are unique to the matrix study. Key words: RDX, photochemistry, argon matrices.

Thermal Decomposition of Li(NTO)·2H2O and Na(NTO)·H2O (NTO = Anion of 3-Nitro-1,2,4-triazol-5-one): Kinetics Derived from T-jump/FTIR Spectroscopy

2006 ◽  
Vol 71 (1) ◽  
pp. 129-137 ◽  
Author(s):  
Yuanhua Sun ◽  
Tonglai Zhang ◽  
Jianguo Zhang ◽  
Xiaojing Qiao ◽  
Li Yang ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Energetic Material ◽  
Burning Surface ◽  
High Sensitivity ◽  
Control Voltage ◽  
Differential Scanning Colorimetry ◽  
Voltage Trace ◽  
Dsc Method ◽  
Phase Chemistry ◽  
Kinetics Of

A "snapshot" simulation of the surface reaction zone is captured by a thin film of material heated rapidly to temperatures characteristic of the burning surface by using the T-jump/FTIR spectroscopy. The time-to-exotherm (tx) kinetics method derived from the control voltage trace of the Pt filament can be introduced to resolve the kinetics of an energetic material owing to its high sensitivity to the thermochemical reactions. The kinetic parameters of the two title compounds are determined under different pressures. The results show that Li(NTO)·2H2O and Na(NTO)·H2O (NTO = anion of 3-nitro-1,2,4-triazol-5-one) exhibit weak pressure dependence, their decomposition is dominated by the condensed phase chemistry irrespective of the pressure in the 0.1-1.1 MPa range. The values of Ea determined here are smaller than those given by a traditional non-isothermal differential scanning colorimetry (DSC) method, which might be resembled as the surface of explosion more closely and enabled the pyrolysis surface to be incorporated into models of steady and possibly unsteady combustion. The kinetics can also be successfully used to understand the behavior of the energetic material in practical combustion problems.

Aggregation kinetics of bovine serum albumin studied by FTIR spectroscopy and light scattering

2004 ◽  
Vol 107 (2) ◽  
pp. 175-187 ◽  
Author(s):  
Valeria Militello ◽  
Carlo Casarino ◽  
Antonio Emanuele ◽  
Antonella Giostra ◽  
Filippo Pullara ◽  
...  
Keyword(s):  
Light Scattering ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Ftir Spectroscopy ◽  
Bovine Serum ◽  
Aggregation Kinetics ◽  
Kinetics Of

Spectroscopy and kinetics of germylene and digermene reactions photogenerated in the condensed phase

2007 ◽  
Vol 76 (10) ◽  
pp. 931-949 ◽  
Author(s):  
V F Plyusnin ◽  
M V Kaletina ◽  
T V Leshina
Keyword(s):  
Condensed Phase ◽  
Kinetics Of

Products and Kinetics of Flash Pyrolysis of Peg: A Minimum Smoke Binder

1995 ◽  
Vol 418 ◽  
Author(s):  
H. Arisawa ◽  
T. B. Brill
Keyword(s):  
Ftir Spectroscopy ◽  
Product Distribution ◽  
Polymer Structure ◽  
Flash Pyrolysis ◽  
Volatile Products ◽  
Kinetics Of

AbstractFlash pyrolysis of polyethyleneglycol by T-Jump/FTIR spectroscopy to temperatures of the surface during combustion reveals that volatile products arise from approximately equal amounts of C-O and C-C homolysis. Nine volatile products are discussed. The average number of repeating units in the volatile oligomers is 2.5. A shift in product distribution occurs at 420–480°C resulting from a change in the polymer structure. Below 420°C, di- and mono-ether oligomers and diethyleneglycol dominate. Above 480°C, the mono-ethers and ethyleneglycol dominate. The Arrhenius constants for decomposition reflect this difference: Ea=8.8 kcal mol−1, In (A, s−1) =2.0 at 370–420°C and Ea=19 kcal mol−1, In (A, s−1)=10 at 480–550°C.

scholarly journals Simultaneous DSC-FTIR spectroscopy: Comparison of cross-linking kinetics of an epoxy/amine resin system

2012 ◽  
Vol 543 ◽  
pp. 9-17 ◽  
Author(s):  
Surya D. Pandita ◽  
Liwei Wang ◽  
Ramani S. Mahendran ◽  
Venkata R. Machavaram ◽  
Muhammad S. Irfan ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Cross Linking ◽  
Resin System ◽  
Epoxy Amine ◽  
Kinetics Of

scholarly journals Нуклеация и рост зародышей новой фазы в гетерогенных реакциях

2019 ◽  
Vol 61 (12) ◽  
pp. 2412
Author(s):  
Н.М. Корценштейн
Keyword(s):  
Complex Systems ◽  
Condensed Phase ◽  
Growth Rates ◽  
Heterogeneous Reaction ◽  
Nucleation And Growth ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Definite Kind ◽  
Kinetics Of ◽  
Development Mechanism

Abstract Expressions for the nucleation and growth rates for condensed particles in a heterogeneous reaction of a definite kind have been derived, which allows the kinetics of the formation of the condensed phase in some complex systems to be described. Methods of the classical nucleation theory and an assumption about the reaction development mechanism were used.

scholarly journals Structural changes evidenced by FTIR spectroscopy in cellulosic materials after pre-treatment with ionic liquid and enzymatic hydrolysis

BioResources ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 400-413
Author(s):  
Iuliana Spiridon ◽  
Carmen-Alice Teacă ◽  
Ruxanda Bodîrlău
Keyword(s):  
Ionic Liquids ◽  
Ftir Spectroscopy ◽  
Structural Changes ◽  
Asclepias Syriaca ◽  
Structural Modifications ◽  
Pre Treatment ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Cellulose Materials ◽  
Cellulase Hydrolysis

Attempts were made to enhance the hydrolysis of Asclepias syriaca (As) seed floss and poplar seed floss (PSF) by cellulase after pre-treatment with ionic liquids. Two ionic liquids, namely 1-butyl-3-methylimidazolium chloride [BMIM]Cl and 1-ethyl-3-methylimidazolium tetrachloroaluminate [EMIM]Cl-AlCl3, were used. In comparison with conventional cellulose pretreatment processes, the ionic liquids were used under a milder condition corresponding to the optimum activity of cellulase. Hydrolysis kinetics of the IL-treated cellulose materials was significantly enhanced. The initial hydrolysis rates for IL-treated cellulose materials were greater than those of non-treated ones. The structural modifications of hydrolyzed cellulose materials were analyzed using FTIR spectroscopy.

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