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Synthesis of organ-soluble copolyimides by one-step polymerization and fabrication of high performance fibers.
- Source :
-
Journal of Materials Science . Nov2013, Vol. 48 Issue 21, p7594-7602. 9p. 1 Black and White Photograph, 2 Diagrams, 3 Charts, 7 Graphs. - Publication Year :
- 2013
-
Abstract
- A series of organ-soluble copolyimides (co-PIs) were synthesized from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), 2,2′-bis(trifluoromethyl)-4, 4′-diaminobiphenyl (TFMB), and 2-(4-aminophenyl)-5-aminobenzimidazole (BIA) via a one-step polymerization in N-methyl-2-pyrrolidone (NMP). The polyimide solutions were used to fabricate as-spun polyimide fiber by a wet-spinning process. SEM images of the round cross-section of the fibers indicated that a homogeneous and dense fibrous structure was produced in the coagulation bath of HO /NMP = 90/10 (v/v) and many microfibrils appeared on the surface. The drawn fibers exhibit excellent mechanical properties, and the strength and modulus of BTDA/TFMB/BIA co-PI fibers (TFMB/BIA = 50/50) reached 2.25 and 102 GPa with a draw ratio of 3.0. The 5 % weight loss temperature of the co-PI fibers in thermogravimetric analysis spectra achieved 548-563 °C in an air atmosphere. The glass transition temperatures were found to be between 340 and 366 °C according to the DMA results. Annealed BTDA/TFMB/BIA co-PI fibers displayed distinct wide-angle X-ray patterns, and crystallinity and crystal orientation with various draw ratios were observed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 48
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 89702901
- Full Text :
- https://doi.org/10.1007/s10853-013-7576-2