An Approach to Examination of Thermal Decomposition by Novel Evolved Gas Analysis

2008 ◽  
pp. 67-72
Author(s):  
Takahisa Tsugoshi ◽  
Takaaki Nagaoka ◽  
Masaki Yasuoka ◽  
Koji Watari
Keyword(s):  
Thermal Decomposition ◽  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
Evolved Gas

Thermal decomposition studies on polyurethane elastomers reinforced with polyhedral silsesquioxanes by evolved gas analysis

2018 ◽  
Vol 149 ◽  
pp. 129-142 ◽  
Author(s):  
Joanna Pagacz ◽  
Edyta Hebda ◽  
Bartłomiej Janowski ◽  
Dariusz Sternik ◽  
Małgorzata Jancia ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
Polyurethane Elastomers ◽  
Evolved Gas

Thermal evolution of Mg-Al-CO3 hydrotalcites

Clay Minerals ◽  
2004 ◽  
Vol 39 (2) ◽  
pp. 177-191 ◽  
Author(s):  
Ts. Stanimirova ◽  
N. Piperov ◽  
N. Petrova ◽  
G. Kirov
Keyword(s):  
Thermal Decomposition ◽  
Mixed Oxides ◽  
Thermal Evolution ◽  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
Water Molecules ◽  
Evolved Gas ◽  
Al Content ◽  
Dta Curves ◽  
High Al Content

AbstractThe thermal decomposition of hydrotalcite (HT), with chemical composition Mg1-xAlx(OH)2(CO3)x/2.(1-3x/2)H2O, (0.20 < x ≤ 0.33), is a complex sequence of dehydration, dehydroxylation and decarbonization and leads to the formation of a series of metaphases: HT-D (dehydrated HT), HT-B (partially dehydroxylated HT) and MO (mixed oxides with periclase-like structure). The evolution of water and CO2 in natural and synthetic hydrotalcites (a Mg/Al ratio between 2:1and 3.7:1), heated to 800°C, was investigated by differential thermal analysis, thermogravimetry and evolved gas analysis. At least six endothermic and two exothermic effects were established by computer-aided resolving of the curves. The formation of each HT metaphase was related to the release of a discrete number of water molecules depending on the Al content in the samples and each appeared as a corresponding endothermic peak in the DTA curves. The exothermic processes associated with the crystallization of HT-B and MO metaphases were specified by decomposition of DTA curves. The evolution of CO2 during the thermal decomposition of the carbonate groups was found to be different for the samples studied. The preservation of CO3 even at high temperatures was established for synthetic samples with a high Al content. The release of volatile H2O and CO2 (which comprise ~40% of the sample mass) provokes fine cracking both along and across the layers.

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