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.

Polymer structure and catalytic activity of ion exchangers

1981 ◽  
Vol 46 (7) ◽  
pp. 1577-1587 ◽  
Author(s):  
Karel Jeřábek
Keyword(s):  
Catalytic Activity ◽  
Ethyl Acetate ◽  
Active Sites ◽  
Crosslinking Agent ◽  
Reaction Medium ◽  
Polymer Structure ◽  
Local Concentration ◽  
Ion Exchangers ◽  
Styrene Divinylbenzene ◽  
Kinetics Of

Catalytic activity of ion exchangers prepared by partial sulphonation of styrene-divinylbenzene copolymers in reesterifications of ethyl acetate by methanol and propanol, hydrolysis of ethyl acetate and in synthesis of bisphenol A has been compared with data on polymer structure of these catalysts and with distribution of the crosslinking agent, divinylbenzene, calculated from literature data on kinetics of copolymerisation of styrene with divinylbenzene. It was found that the polymer structure of ion exchangers influences catalytic activity predominantly by changing the local concentration of acid active sites. The results obtained indicated that the effect of transport phenomena on the rate of catalytic reactions does not depend on the degree of swelling of the ion exchangers in reaction medium but it is mainly dependent on the relative affinity of reaction components to the acid groups or to the polymer skeleton.

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.

Product distribution for flash pyrolysis of cellulose in a coil pyrolyzer

1987 ◽  
Vol 10 (3) ◽  
pp. 225-249 ◽  
Author(s):  
T. Funazukuri ◽  
R.R. Hudgins ◽  
P.L. Silveston
Keyword(s):  
Product Distribution ◽  
Flash Pyrolysis

Kinetics of Flash Pyrolysis of [Co(CHZ3](ClO42 and [Ni(CHZ)3](ClO4)2

2006 ◽  
Vol 22 (06) ◽  
pp. 649-652 ◽  
Author(s):  
SUN Yuan-Hua ◽  
◽  
◽  
ZHANG Tong-Lai ◽  
ZHANG Jian-Guo ◽  
...  
Keyword(s):  
Flash Pyrolysis ◽  
Kinetics Of

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
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