Synchrotron Radiation SAXS Study of Microvoids Structure of PAN Fiber during Spinning Process

Abstract:

The microvoids structure changes of the PAN fibers were characterized by synchrotron radiation SAXS. The synchrotron radiation SAXS patterns and the changes of scattering intensity show that after various fiber spinning process, microviods were gradually oriented in parallel with the fiber axis, and the number of the microvoids was decreased. Fankuchen tangent method was used to deal with the experimental data. After the first coagulation bath, a large number of microvoids were formed in fibers, the aspect ratio was close to 1.0, the shape was nearly spherical, and the radius of gyration (Rg) was 14nm. During plasticizing drawing and washing process, the dimension of microvoids was decreased. Rg was 10nm, the aspect ratio reached 1.6, the shape of the microvoids was nearly ellipsoidal, and the microvoids exhibited preferred orientation along the fiber axis direction. After the processes drying collapsing and drawing in vapor, the scattering intensity of fiber drastically decreased, the number of microvoids significantly reduced, Rg turned to 12.9nm, and the aspect ratio reached 1.9. During heat setting process, the aspect ratio of microvoids reduced, but Rg slightly increased.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 2923-2927
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.2923
• Online since: January 2013
• Authors: Xue Ping Gao, Bo Zhu, Yang Chen
• Keywords: Microvoids Structure, PAN Fiber, Synchrotron Radiation SAXS

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