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Study on Crystallization Behaviors and Properties of F-III Fibers during Hot Drawing in Supercritical Carbon Dioxide

1
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
2
Shanghai Key Laboratory of Lightweight Composite, Shanghai 201620, China
3
School of Materials Engineer, Shanghai University of Engineer Science, Shanghai 201620, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(5), 856; https://doi.org/10.3390/polym11050856
Received: 1 April 2019 / Revised: 4 May 2019 / Accepted: 7 May 2019 / Published: 10 May 2019
(This article belongs to the Special Issue Supercritical Fluid Processing of Polymers)
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Abstract

In order to obtain F-III fibers with high mechanical properties, pristine F-III fibers were hot drawn at the temperature of 250 °C, pressure of 14 MPa, tension of 6 g·d−1, and different times, which were 15 min, 30 min, 45 min, 60 min, 75 min, 90 min, and 105 min, respectively, in supercritical carbon dioxide (Sc-CO2) in this article. All the samples, including the pristine and treated F-III fibers, were characterized by a mechanical performance tester, wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), and thermogravimetric analysis (TGA). The results showed that the thermal stability of F-III fibers was enhanced to some extent, and the tensile strength and modulus of F-III fibers had great changes as the extension of treatment time during hot drawing in Sc-CO2, although the treatment temperature was lower than the glass transition temperature (Tg) of F-III fibers. Accordingly, the phase fraction, orientation factor fc of the (110) crystal plane, fibril length lf, and misorientation angle Bφ of all the samples were also investigated. Fortunately, the hot drawing in Sc-CO2 was successfully applied to the preparation of F-III fibers with high mechanical properties. View Full-Text
Keywords: F-III fibers; hot drawing; wide-angle X-ray scattering; small-angle X-ray scattering; mechanical properties; thermal stability F-III fibers; hot drawing; wide-angle X-ray scattering; small-angle X-ray scattering; mechanical properties; thermal stability
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Ding, X.; Kong, H.; Qiao, M.; Hu, Z.; Yu, M. Study on Crystallization Behaviors and Properties of F-III Fibers during Hot Drawing in Supercritical Carbon Dioxide. Polymers 2019, 11, 856.

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