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- W2023409727 abstract "Melt spinning behavior of polyimide filaments and their mechanical properties at temperature range up to 400°C were investigated. The region of elongational deformation was narrow and was less than 2cm from the spinneret under the spinning condition at the extruded temperature of 404°C, the extrusion rate of 1.88×10-3cm3/s and the take-up velocity of 47.2cm/s. Elongational viscosity of the deformation region ranged from 105 to 107 poise. Activation energy for the elongational flow was calculated to 80kcal/mol and it was much larger than that of a linear type PPS. The narrow deformation region, and the large elongational viscosity and activation energy were discussed with molecular rigidity of the polyimide. Temperature dependence of dynamic storage modulus (E′) of the annealed filaments taken up above 47.1cm/s showed plateau and terminal zone at temperatures higher than the primary dispersion temperature of about 240°C. E′ in the plateau zone and the temperature at the beginning of the terminal zone of the filaments increased with increasing the take-up velocity. Maximum value of E′ at 325°C was 2×109 dyn/cm2. It was indicated that the different features of E′ above the primary dispersion temperature were associated with not only crystallinity but also molecular orientation in the filaments." @default.
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- W2023409727 date "1992-01-01" @default.
- W2023409727 modified "2023-09-25" @default.
- W2023409727 title "Melt spinning and mechanical properties of polyimide." @default.
- W2023409727 doi "https://doi.org/10.2115/fiber.48.3_105" @default.
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