| Kinetics in Thermal Decomposition of Polymers by Controlled Rate-Thermal Analysis (CRTA) and Simultaneous TG-MS Analysis |
>> Full Text PDF
>> References |
|
* Thermal Analysis Division, Rigaku Corporation (3-9-12 Matsubara-cho, Akishima-shi, Tokyo 196-8666, Japan) |
||
|
Kinetic study in thermal decomposition of polymeric materials has been examined by means of simultaneous thermogravimetric-mass spectrometric (TG-MS) analysis and controlled-rate thermogravimetry (CRTG) which belongs to controlled-rate thermal analysis (CRTA). We proposed rate-jump control (RJC) method in which the preselected two decomposition rates are controlled alternately at the interval of the constant weight loss percentage, in order to estimate the apparent activation energy without preliminary knowledge of the actual mechanism. The reaction models governing the thermal decomposition of poly(caproamide) (Nylon-6) and poly-(methyl methacrylate) (PMMA) will be easily attributed by the shape of curves observed from constant decomposition rate control (CDRC) experiments. The each kinetic parameter sets were estimated from the RJC data and the evolved gas components obtained from simultaneous TG-MS system, and the corresponding kinetic models were reaction of a random scission in the main chain with L = 2 (L is the smallest polymerization degree of polymer that does not evaporate) and 1.5 order reaction of depolymerization, respectively. It is concluded that the combination of analytical techniques by the thermogravimetric curves obtained from CRTG and chemical species obtained from TG-MS, is capable of establishing the uniqueness of kinetic parameters and reaction models, when dealing with thermal decomposition reaction in polymers. | ||
| Key words: Kinetics, Controlled-rate thermal analysis (CRTA), Controlled-rate thermogravimetry (CRTG), Constant decomposition rate control (CDRC), Rate-jump control (RJC), Thermal decomposition, Simultaneous thermogravimetrymass pectrometry (TG-MS), Reaction model | ||
| [ Full Text PDF ] [ References ] |
| © COPYRIGHT by The Mass Spectrometry Society of Japan. All Rights Reserved. |