Relationship between Crystallization Behavior and Mechanical Performance of F-III Fibers under Different Tensions in Supercritical Carbon Dioxide

Abstract:

In this article, the supercritical carbon dioxide (Sc-CO₂) was used as a medium for hot-drawing of F-III fibers. The conditions of hot-drawing were selected to be the temperature of 250 °C, pressure of 14 MPa, time of 60 min, and different tensions, which were 0, 3, 4.5, 6, and 7.5 g·d^-1, respectively. All samples including the untreated and treated F-III fibers were characterized by a mechanical tester and X-ray diffraction (XRD). Results showed that the Sc-CO₂ and applied tension could both promote the crystallinity and degree of orientation of F-III fibers at a temperature below the Tg of F-III fibers in Sc-CO₂. Moreover, compared with the untreated, the tensile strength and modulus of treated F-III fibers tended to increase with the increase of tension in the range of 0 ~ 6 g·d^-1. In summary, this provided a new treatment mode for the hot-drawing of fibers.

• Periodical: Materials Science Forum (Volume 976)
• Pages: 77-83
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.976.77
• Online since: January 2020
• Authors: Xiao Ma Ding, Hai Juan Kong, Meng Meng Qiao, Zhi Feng Hu, Mu Huo Yu*
• Keywords: Crystallinity, Degree of Orientation, F-III Fibers, Mechanical Performance, Supercritical Carbon Dioxide

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