High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology
AB-polybenzimidazole (ABPBI) dissolution kinetics in an eco-friendly complex acid-free solvent based on dimethyl sulfoxide (DMSO), methanol and KOH, and the rheological behavior of their solutions are investigated. The optimal component ratio of solvent providing the complete ABPBI dissolution is de...
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| Format: | Article |
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MDPI AG
2022-11-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/21/4648 |
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| author | Ivan Y. Skvortsov Lydia A. Varfolomeeva Igor I. Ponomarev Kirill M. Skupov Aleksandra A. Maklakova Valery G. Kulichikhin |
| author_facet | Ivan Y. Skvortsov Lydia A. Varfolomeeva Igor I. Ponomarev Kirill M. Skupov Aleksandra A. Maklakova Valery G. Kulichikhin |
| author_sort | Ivan Y. Skvortsov |
| collection | DOAJ |
| description | AB-polybenzimidazole (ABPBI) dissolution kinetics in an eco-friendly complex acid-free solvent based on dimethyl sulfoxide (DMSO), methanol and KOH, and the rheological behavior of their solutions are investigated. The optimal component ratio of solvent providing the complete ABPBI dissolution is determined. Methanol containing dissolved KOH contributes to the creation of a single-phase superbasic medium, which accelerates and improves the polymer solubility in a mixture with DMSO, significantly reducing the viscoelasticity of the resulting solution. The optimum methanol content is up to 60 wt.% related to DMSO. The polymer dissolution rate increases by 5 times in this composition. It found the polymer concentration of 9% is close to the dissolution limit due to the strong solution structuring, which is probably associated with an increase in the amount of water released during the KOH-methanol-DMSO interactions. As a result, the conditions for obtaining high concentrated solutions in a complex, mainly organic solvent for fiber spinning are developed. The viscoelastic properties of solutions are measured in the concentration range of 1–9% at temperatures of 20–50 °C. The flow activation energy for 7 and 9% solutions decreases by 1.5 and 2.3 times, respectively, as the content of methanol in the complex solvent increases from 10 to 60%. |
| first_indexed | 2024-03-09T18:43:32Z |
| format | Article |
| id | doaj.art-d28e30425d41452b965a81b6e3faae0c |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T18:43:32Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-d28e30425d41452b965a81b6e3faae0c2023-11-24T06:29:40ZengMDPI AGPolymers2073-43602022-11-011421464810.3390/polym14214648High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and RheologyIvan Y. Skvortsov0Lydia A. Varfolomeeva1Igor I. Ponomarev2Kirill M. Skupov3Aleksandra A. Maklakova4Valery G. Kulichikhin5A.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences, Leninsky Av. 29, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences, Leninsky Av. 29, 119991 Moscow, RussiaA.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, Bld. 1, 119334 Moscow, RussiaA.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, Bld. 1, 119334 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences, Leninsky Av. 29, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences, Leninsky Av. 29, 119991 Moscow, RussiaAB-polybenzimidazole (ABPBI) dissolution kinetics in an eco-friendly complex acid-free solvent based on dimethyl sulfoxide (DMSO), methanol and KOH, and the rheological behavior of their solutions are investigated. The optimal component ratio of solvent providing the complete ABPBI dissolution is determined. Methanol containing dissolved KOH contributes to the creation of a single-phase superbasic medium, which accelerates and improves the polymer solubility in a mixture with DMSO, significantly reducing the viscoelasticity of the resulting solution. The optimum methanol content is up to 60 wt.% related to DMSO. The polymer dissolution rate increases by 5 times in this composition. It found the polymer concentration of 9% is close to the dissolution limit due to the strong solution structuring, which is probably associated with an increase in the amount of water released during the KOH-methanol-DMSO interactions. As a result, the conditions for obtaining high concentrated solutions in a complex, mainly organic solvent for fiber spinning are developed. The viscoelastic properties of solutions are measured in the concentration range of 1–9% at temperatures of 20–50 °C. The flow activation energy for 7 and 9% solutions decreases by 1.5 and 2.3 times, respectively, as the content of methanol in the complex solvent increases from 10 to 60%.https://www.mdpi.com/2073-4360/14/21/4648Poly(2,5(6)-benzimidazoleABPBIsolubilitycomplex superbasic medium solventsrheologypolymer dopes for spinning |
| spellingShingle | Ivan Y. Skvortsov Lydia A. Varfolomeeva Igor I. Ponomarev Kirill M. Skupov Aleksandra A. Maklakova Valery G. Kulichikhin High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology Polymers Poly(2,5(6)-benzimidazole ABPBI solubility complex superbasic medium solvents rheology polymer dopes for spinning |
| title | High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology |
| title_full | High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology |
| title_fullStr | High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology |
| title_full_unstemmed | High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology |
| title_short | High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology |
| title_sort | high molecular weight ab polybenzimidazole and its solutions in a complex organic solvent dissolution kinetics and rheology |
| topic | Poly(2,5(6)-benzimidazole ABPBI solubility complex superbasic medium solvents rheology polymer dopes for spinning |
| url | https://www.mdpi.com/2073-4360/14/21/4648 |
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