Unusual Structural Changes of PIM-1 Polymer Detected by Means of Chromatographic Technique
| Autor: | V. E. Shiryaeva, Alexander Kurganov, A. Yu. Kanat’eva, Popova Tamara P, A. A. Korolev |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Chromatography Polymers and Plastics Chemistry Diffusion 02 engineering and technology General Chemistry Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Adsorption Ageing Materials Chemistry Chemical stability 0210 nano-technology Constant (mathematics) Equilibrium constant Chemical decomposition |
| Zdroj: | Polymer Science, Series C. 61:198-204 |
| ISSN: | 1555-614X 1811-2382 |
| DOI: | 10.1134/s1811238219010168 |
| Popis: | Changes in retention factor k of light hydrocarbons on PIM-1 stationary phase with an increase of ageing temperature are tested. Varying the ageing temperature from 50 to 200°C causes a slight decrease in solute retention, which, however, changes to strong increase as soon as the ageing temperature exceeds 200°C. An increase of the solute retention factor k means the proportional increase of the Henry equilibrium constant K, which in turn under constant chromatographic conditions probably points out the thermodynamic changes in the structure of PIM-1 which can be caused either by a chemical decomposition or by a structural rearrangement. Due to high chemical stability of PIM-1, an increase of solute retention with thermal ageing is a consequence of structural rearrangements of polymeric chains, resulting in more adapted adsorption sites. At the same time, accessibility of the adsorption sites decreases as it is indicated by the reduction of column efficiency and diffusion coefficients. |
| Databáze: | OpenAIRE |
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