Effective increase in permeability and free volume of PIM copolymers containing ethanoanthracene unit and comparison between the alternating and random copolymers
| Autor: | Nikolay A. Belov, V.P. Shantarovich, Jianyong Jin, Ludmila Starannikova, Yuri Yampolskii, Jian Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Filtration and Separation 02 engineering and technology Polymer Permeation 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences chemistry.chemical_compound Membrane Monomer chemistry Volume (thermodynamics) Chemical engineering Permeability (electromagnetism) Polymer chemistry Copolymer General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy |
| Zdroj: | Journal of Membrane Science. 548:593-597 |
| ISSN: | 0376-7388 |
| Popis: | To investigate possible effects of monomer's sequence distribution along the chain of polymers of intrinsic microporosity the two model PIM copolymers having well-defined alternating fashion (A1) and statistically random distributed fashion (S1), respectively, were prepared. A detailed determination of gas permeation parameters was performed and free volume via positron annihilation lifetime spectroscopy was studied for these materials. Investigation of their gas permeability showed that the alternating copolymer A1 revealed somewhat higher permselectivity and lower permeability coefficients than those of the random copolymer S1. Both copolymers are significantly more permeable than the original PIM-1 due to the inclusion of ethanoanthracene co-monomer. The treatment with ethanol results in increases in gas permeability as is the case for many highly permeable glassy polymers. Higher gas permeability of S1 can be explained by larger free volume as estimated via positron annihilation lifetime spectroscopy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect