The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films
Changes of the spectral characteristics of absorption bands depending on the films’ treatment method were registered for polyetherimide Ultem films. The possibility of selection of structural criteria (the ratio of the functional groups absorption bands intensities) showing all conformational change...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-07-01
|
| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/12/7/1578 |
| _version_ | 1797562302194515968 |
|---|---|
| author | Julia Kostina Sergey Legkov Alexander Kolbeshin Roman Nikiforov Denis Bezgin Alexander Yu. Nikolaev Alexander Yu. Alentiev |
| author_facet | Julia Kostina Sergey Legkov Alexander Kolbeshin Roman Nikiforov Denis Bezgin Alexander Yu. Nikolaev Alexander Yu. Alentiev |
| author_sort | Julia Kostina |
| collection | DOAJ |
| description | Changes of the spectral characteristics of absorption bands depending on the films’ treatment method were registered for polyetherimide Ultem films. The possibility of selection of structural criteria (the ratio of the functional groups absorption bands intensities) showing all conformational changes in elementary unit with metrological processing of the results is shown. It is demonstrated that film formation from chloroform solution leads to elementary unit fragments, Ph–O–Ph′, which have an effect on macromolecule conformation and result in increasing of space between fragments of macromolecules (local polymer matrix packing loosening). Desorption of residual chloroform from films by ethanol or supercritical CO<sub>2</sub> leads to a change of conformers set in Im–Ph–Im′ units. Quantum chemical modeling showed the possibility of convergence of these fragments in neighboring macromolecules, and consequently of interchain π–π interaction (local densification of chain packing of the polymer matrix). After annealing at a temperature higher than glass transition temperature, the polyetherimide film exhibits the most disordered (amorphous) state at all of the fragments. It is demonstrated that the results, obtained by the combination of theoretical and experimental vibrational spectroscopy methods, are in good agreement with data of chain packing ordering found by analysis of gas separation parameters. |
| first_indexed | 2024-03-10T18:26:21Z |
| format | Article |
| id | doaj.art-0bd51194cd25492cba6307c03706cc8d |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T18:26:21Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-0bd51194cd25492cba6307c03706cc8d2023-11-20T06:55:43ZengMDPI AGPolymers2073-43602020-07-01127157810.3390/polym12071578The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem FilmsJulia Kostina0Sergey Legkov1Alexander Kolbeshin2Roman Nikiforov3Denis Bezgin4Alexander Yu. Nikolaev5Alexander Yu. Alentiev6A.V. Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences, 119991 Moscow, RussiaA.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119334 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences, 119991 Moscow, RussiaChanges of the spectral characteristics of absorption bands depending on the films’ treatment method were registered for polyetherimide Ultem films. The possibility of selection of structural criteria (the ratio of the functional groups absorption bands intensities) showing all conformational changes in elementary unit with metrological processing of the results is shown. It is demonstrated that film formation from chloroform solution leads to elementary unit fragments, Ph–O–Ph′, which have an effect on macromolecule conformation and result in increasing of space between fragments of macromolecules (local polymer matrix packing loosening). Desorption of residual chloroform from films by ethanol or supercritical CO<sub>2</sub> leads to a change of conformers set in Im–Ph–Im′ units. Quantum chemical modeling showed the possibility of convergence of these fragments in neighboring macromolecules, and consequently of interchain π–π interaction (local densification of chain packing of the polymer matrix). After annealing at a temperature higher than glass transition temperature, the polyetherimide film exhibits the most disordered (amorphous) state at all of the fragments. It is demonstrated that the results, obtained by the combination of theoretical and experimental vibrational spectroscopy methods, are in good agreement with data of chain packing ordering found by analysis of gas separation parameters.https://www.mdpi.com/2073-4360/12/7/1578gas separationpolyetherimideFTIR spectroscopyconformational orderquantum chemical calculationsnon-covalent interactions |
| spellingShingle | Julia Kostina Sergey Legkov Alexander Kolbeshin Roman Nikiforov Denis Bezgin Alexander Yu. Nikolaev Alexander Yu. Alentiev The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films Polymers gas separation polyetherimide FTIR spectroscopy conformational order quantum chemical calculations non-covalent interactions |
| title | The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films |
| title_full | The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films |
| title_fullStr | The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films |
| title_full_unstemmed | The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films |
| title_short | The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films |
| title_sort | effect of conformation order on gas separation properties of polyetherimide ultem films |
| topic | gas separation polyetherimide FTIR spectroscopy conformational order quantum chemical calculations non-covalent interactions |
| url | https://www.mdpi.com/2073-4360/12/7/1578 |
| work_keys_str_mv | AT juliakostina theeffectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT sergeylegkov theeffectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT alexanderkolbeshin theeffectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT romannikiforov theeffectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT denisbezgin theeffectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT alexanderyunikolaev theeffectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT alexanderyualentiev theeffectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT juliakostina effectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT sergeylegkov effectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT alexanderkolbeshin effectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT romannikiforov effectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT denisbezgin effectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT alexanderyunikolaev effectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms AT alexanderyualentiev effectofconformationorderongasseparationpropertiesofpolyetherimideultemfilms |