Geopolymers
Inorganic polymeric new materials
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P. Capek
P. Capek
Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences Dúbravská Cesta 9 845 38 Bratislava Slovakia
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M. Drábik
M. Drábik
Institute of Inorganic Chemistry, Slovak Academy of Sciences Dúbravská Cesta 9 845 36 Bratislava Slovakia
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J. Turjan
J. Turjan
Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences Dúbravská Cesta 9 845 38 Bratislava Slovakia
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Abstract
Carboxymethylation of wheat starch and &-cyclodextrin followed by ultrasonic treatment of carboxymethyl wheat starch afforded starch derivatives differing in molecular size. Their degree of substitution was estimated to be 0.6. Starch materials were further sulfated to give hybrid derivatives with carboxymethyl and sulfate groups. A series of wheat starch and &-cyclodextrin derivatives were characterized by FT-IR spectroscopy and thermogravimetric analysis. Thermal analysis of starch and their derivatives revealed information concerning their thermal stability and decomposition. It has been found that carboxymethylation and sulfation decrease the thermal stability of starch materials. Similarly, their hybrid carboxymethyl-sulfate derivatives showed the same effect. Further, it has been found that the thermal stability of cyclic molecules was higher in comparison with linear ones.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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