Thermal analysis for the assessment of antioxidant content in polyethylene
| Autor: | U.W. Gedde, K. Karlsson, C. Assargren |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Arrhenius equation
Antioxidant Polymers and Plastics medicine.medical_treatment Organic Chemistry Inorganic chemistry Concentration effect Polyethylene Redox chemistry.chemical_compound symbols.namesake Reaction rate constant chemistry Differential thermal analysis symbols medicine Organic chemistry Thermal analysis |
| Zdroj: | Polymer Testing. 9:421-431 |
| ISSN: | 0142-9418 |
| DOI: | 10.1016/0142-9418(90)90033-a |
| Popis: | Dynamic differential thermal analysis (DTA) data on a series of polyethylene (PE) samples containing known contents of two primary (phenol and amine) and two secondary (thioester and phosphite) antioxidants are presented. It is shown that the dynamic method, in which the temperature of the start of an exothermal oxidation reaction is measured during a constant heating rate experiment performed in an oxygen atmosphere, can be used as an analytical tool by which the antioxidant content can be determined. A relationship between the oxidation temperature and the concentration of antioxidant is derived on the assumption that the antioxidant consumption follows zero-order kinetics and that the rate constant may be defined in accordance with the Arrhenius equation. This equation fits the presented experimental data for samples with intimately mixed antioxidant. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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