97/00975 Studies of initial stage in coal liquefaction. Radical formation and structural change with thermal decomposition of coal

1997 ◽  
Vol 38 (2) ◽  
pp. 82
Keyword(s):  
Thermal Decomposition ◽  
Structural Change ◽  
Radical Formation ◽  
Coal Liquefaction ◽  
Initial Stage

Thermal Decomposition and Flame Retardance Behavior of Nanometer Magnesium Oxychloride Crystal Salt Involved in SMC

2009 ◽  
Vol 66 ◽  
pp. 163-166 ◽  
Author(s):  
Jian Li ◽  
Zhi Xiong Huang ◽  
Ying Zhao
Keyword(s):  
Thermal Decomposition ◽  
Flame Retardance ◽  
Scanning Calorimetry ◽  
Structural Water ◽  
Crystal Water ◽  
Molding Compound ◽  
Sheet Molding Compound ◽  
Initial Stage ◽  
Magnesium Oxychloride ◽  
Decomposition Behavior

A detailed study of thermal decomposition behavior of nanometer magnesium oxychloride crystal salt involved in sheet molding compound has been carried out using differential scanning calorimetry, thermogravimetry and X-ray diffraction. The decomposing temperature changed from 112°C at the initial stage to 559°C at the end of the process. The results indicated that the thermal decomposition was carried out in the following three steps: releasing crystal water, then HCl secondly and finally structural water, the residua was magnesia. Nanometer magnesium oxychloride crystal salt addictives was used as flame retardance in sheet molding compound.

Koordinationsverhalten des Pentafluorphenylxenonium Salzes [C6F5Xe]+[AsF6]- gegenüber Pyridinen unterschiedlicher Basizität / Co-ordinative Behaviour of the Pentafluorophenylxenonium Salt [C6F5Xe]+[AsF6]- to Pyridines of Different Basicity

1995 ◽  
Vol 50 (12) ◽  
pp. 1799-1810 ◽  
Author(s):  
Hermann Josef Frohn ◽  
Thorsten Schroer ◽  
Gerald Henkel
Keyword(s):  
Thermal Decomposition ◽  
Structure Analysis ◽  
Coupling Constants ◽  
Radical Formation ◽  
Pyridinium Salts ◽  
X Ray

The arylxenonium cation in the salt [C6F5Xe]+ [AsF6]- is isoelectronic to C6F5I, but coordinatively unsaturated with respect to N-bases like MeCN and pyridines. Co-ordination of strongly basic pyridines causes weakening of the Xe-C bond and C6F1 radical formation. The thermal decomposition of pyridine co-ordinated arylxenonium cations gives three groups of products: C-pentafluorophenylated pyridines, N-pentafluorophenylated pyridinium and N-protonated pyridinium salts. The co-ordination ability of the different pyridines shows a good correlation (C6F5 group) with the 19F NMR shift values of the p-F atom and the coupling constants 3J (19F-129Xe). An X-ray structure analysis was performed for the co-ordination product [C6F5Xe · 2,6-C5H3F2N ]+ [AsF6]- and for [C6F5-C5H5N]+ [(C6F5)2BF2]-, which was obtained by thermolysis of the corresponding adduct.

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