Silica-Filled Polyacrylonitrile Solutions: Rheology, Morphology, Coagulation, and Fiber Spinning.
| Title: | Silica-Filled Polyacrylonitrile Solutions: Rheology, Morphology, Coagulation, and Fiber Spinning. |
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| Authors: | Varfolomeeva LA; A.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences, Leninsky Av. 29, 119991 Moscow, Russia.; Skvortsov IY; A.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences, Leninsky Av. 29, 119991 Moscow, Russia.; Kuzin MS; A.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences, Leninsky Av. 29, 119991 Moscow, Russia.; Kulichikhin VG; A.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences, Leninsky Av. 29, 119991 Moscow, Russia. |
| Source: | Polymers [Polymers (Basel)] 2022 Oct 27; Vol. 14 (21). Date of Electronic Publication: 2022 Oct 27. |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: MDPI Country of Publication: Switzerland NLM ID: 101545357 Publication Model: Electronic Cited Medium: Internet ISSN: 2073-4360 (Electronic) Linking ISSN: 20734360 NLM ISO Abbreviation: Polymers (Basel) Subsets: PubMed not MEDLINE |
| Imprint Name(s): | Original Publication: Basel : MDPI |
| Abstract: | The fumed silica influence on the morphology, coagulation processes, and rheological properties of suspensions in dimethyl sulfoxide (DMSO) and polyacrylonitrile (PAN)-DMSO solutions has been studied for the production of composite films and fibers. It has been shown that silica-DMSO concentrated suspensions (24 wt%) form a weak gel with a yield point of about 200 Pa. At concentrations of ~5 wt% and above the dispersions, depending on the shear stress, are pseudoplastic or dilatant liquids. It has been found that the silica addition method into a PAN solution has a significant impact on the aggregates dispersibility and the rheological behavior of the obtained systems. A thixotropy appearance and a sharp increase in the relaxation time were observed for PAN solutions at a SiO2 content of more than 3-5 wt%, which indicates the formation of structures with a gel-like rheological behavior. Upon reaching the critical stress their destruction takes place and the system starts to behave like a viscoelastic liquid. Two spinning methods have been used for preparing fibers: standard wet and mechanotropic. By the mechanotropic method it is possible to achieve a higher draw ratio at spinning and to obtain fibers with better mechanical properties. It is possible to spin fibers from PAN solutions containing up to 15 wt% of silica per polymer with a tensile strength up to 600 MPa. |
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| Grant Information: | 17-79-30108 Russian Science Foundation |
| Contributed Indexing: | Keywords: fiber morphology; fiber spinning; polyacrylonitrile; rheology; silica; structured solutions; suspensions |
| Entry Date(s): | Date Created: 20221111 Latest Revision: 20221117 |
| Update Code: | 20260130 |
| PubMed Central ID: | PMC9654655 |
| DOI: | 10.3390/polym14214548 |
| PMID: | 36365543 |
| Database: | MEDLINE |
Journal Article