Study of the Polymerization Kinetic of Lactic Acid
| Autor: | Andrés F. Vargas, Betty L. López, Víctor H. Orozco |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Condensation polymer Polymers and Plastics Organic Chemistry Sulfonic acid Condensed Matter Physics Biodegradable polymer Lactic acid Gel permeation chromatography chemistry.chemical_compound chemistry Polylactic acid Polymerization Chemical engineering Materials Chemistry Organic chemistry Fourier transform infrared spectroscopy |
| Zdroj: | Macromolecular Symposia. 258:45-52 |
| ISSN: | 1521-3900 1022-1360 |
| Popis: | Biodegradable polymers production is growing, mainly poly (lactic) acid, due to the fact that it is environmentally friendly and might be used in different fields i.e. medicine, agriculture, textiles, etc. Hence the importance of studying the polymerization process and its kinetic parameters. The polymerization process is performed by polycondensation of lactic acid using different kinds and amounts of tin based catalysts. This process is monitored during 12 hours and samples are taking for analyses every hour. Each sample is measured by gel permeation chromatography (GPC) to determine its molecular weight and by Fourier transformed infrared (FTIR) to study the evolution of alkyl absorption bands and the disappearing of hydroxyl ones. Modulated differential scanning calorimetric analysis (MDSC) is used to study the thermal behavior of every sample during each period, such as Tg displacement and changes in crystallization and melting. These data are used for the construction of the kinetic curve. |
| Databáze: | OpenAIRE |
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