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- W2157178850 abstract "Novel high-performance copolyimide (co-PI) fibers containing benzimidazole and benzoxazole ring in the main chain were prepared by a two-step spinning via the poly(amic acid)s. Effects of the incorporated benzimidazole and benzoxazole units on the micro-structure and properties of co-PI fibers were investigated. Fourier transform infrared (FTIR) results indicated that hydrogen bonding is formed in the co-PI fibers. The co-PI fibers exhibited discernible crystallization peaks at 14°∼15° and 23°∼26° (2θ), showing crystalline-like structure. Moreover, the packing type of benzimidazole-imide units determined the macromolecules packing of co-PIs. It was amazedly found that the co-PI fibers exhibited higher tensile strength and initial modulus than those of corresponding homo-PI fibers, reaching tensile strength of 2.2–2.6 GPa, initial modulus of 99.1–113.2 GPa. The results of dynamic mechanical analysis (DMA) indicated co-PI2 fiber had a positive Tg deviation due to the presence of strong intermolecular hydrogen bonding between benzimidazole-imide and benzoxazole-imide units, which maybe lead to the effective stress transfer between benzimidazole-imide units and benzoxazole-imide units. In addition, the obtained PI fibers exhibited excellent thermal properties with the 10% weight loss temperatures under N2 in the range of 574–585°C. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42001." @default.
- W2157178850 created "2016-06-24" @default.
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- W2157178850 date "2015-02-12" @default.
- W2157178850 modified "2023-09-27" @default.
- W2157178850 title "High-performance copoly(benzimidazole-benzoxazole-imide) fibers: Fabrication, structure, and properties" @default.
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- W2157178850 doi "https://doi.org/10.1002/app.42001" @default.
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