Thermogravimetric analysis of the decomposition characteristics of two kinds of calcium based organic compounds

Decomposition characteristics of the products of the modified calcium hydroxide by propionic acid (named as MCP) and the modified calcium hydroxide and magnesium oxide by propionic acid (named as MCMP) have been investigated through the thermogravimetric analysis. Thermal decomposition process of MCP and MCMP mainly consists of two mass loss segments which are the release of organic radical in low temperature zone and carbon dioxide in high temperature zone, respectively. As temperature heating rate is increased from 10 K min− 1 to 17.5 K min− 1, the decomposition process is shifted to higher temperature zone, but not distinctly. However, the maximum mass loss rate is obviously increased at the higher temperature heating rate. Model free approaches of the Ozawa–Flynn–Wall method and the Vyazovkin method are used to calculate the activation energy and Avrami theory is used to estimate the reaction order. Variations of these two parameters at different reaction degrees demonstrate the multistage and complicated characteristics of MCP and MCMP during the thermal decomposition process.

Decomposition characteristics of two kinds of calcium based organic compounds have been investigated through thermogravimetric analysis. The Ozawa -Flynn -Wall method and Vyazovkin method are used to calculate the activation energy and the Avrami theory is used to estimate the reaction order. Fig.1(a) shows the typical TG and DTG curves of MCP.Figure optionsDownload as PowerPoint slideResearch Highlights
► Thermal decomposition characteristics of two new kinds of calcium based organic compounds are investigated through thermogravimetric analysis. These two compounds are chemically synthesized from magnesium oxide, calcium hydroxide and propionic acid.
► Thermal decomposition process consists of the release of organic radical and carbon dioxide. As temperature heating rate is heightened, the decomposition process is shifted to higher temperature zone and the maximum mass loss rate is increased.
► Ozawa–Flynn–Wall method and Vyazovkin method are used to calculate activation energy and Avrami theory is used to estimate reaction order. Variations of these two parameters demonstrate the multistage of MCP and MCMP during the thermal decomposition process.