Effects of Drawing and Heat-Treatment Conditions on the Structure and Mechanical Properties of Polyhydroxyamide and Polybenzoxazole Fibers 


Vol. 19,  No. 8, pp. 1626-1631, Aug.  2018
10.1007/s12221-018-8241-9


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  Abstract

We report the preparation of polybenzoxazole (PBO) fiber from polyhydroxyamide (PHA) precursor fiber which is free from strong acid such as polyphosphoric acid. We prepared the PHA fibers with different spin-draw ratios (SDRs) using a wet-spinning method and the PBO fibers with an SDR of 3.5 (SDR-3.5 PBO fibers) were prepared by various heattreatment temperatures, and investigated their morphology, crystalline structure, and mechanical properties. The simultaneous thermogravimetric analysis-mass spectrometry (STA-MS) and field-emission scanning electron microscopy (FE-SEM) results confirmed that the diameter of the SDR-3.5 PBO fiber was much smaller than that of the SDR-3.5 PHA fiber, due to the release of water during the thermal cyclization reaction which forms the PBO structure. The wide-angle X-ray diffraction (WAXD) pattern of the SDR-3.5 PBO fiber heat-treated at 350 oC (SDR-3.5 PBO 350 fiber) showed two peaks, at 2罐=14.83 o and 24.38 o, and the diffraction angles dropped with increasing heat-treatment temperature. In addition, the initial modulus and tensile strength of the SDR-3.5 PBO fiber heat-treated at 550 oC (SDR-3.5 PBO 550 fiber) were found to be 19.1 GPa and 449.2 MPa, which were much higher than those of the SDR-3.5 PHA fiber, 9.3 GPa and 227.0 MPa, respectively.

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  Cite this article

[IEEE Style]

C. S. Kang, M. H. Jee, M. J. Yeo, D. H. Baik, "Effects of Drawing and Heat-Treatment Conditions on the Structure and Mechanical Properties of Polyhydroxyamide and Polybenzoxazole Fibers," Fibers and Polymers, vol. 19, no. 8, pp. 1626-1631, 2018. DOI: 10.1007/s12221-018-8241-9.

[ACM Style]

Chan Sol Kang, Min Ho Jee, Moon Jin Yeo, and Doo Hyun Baik. 2018. Effects of Drawing and Heat-Treatment Conditions on the Structure and Mechanical Properties of Polyhydroxyamide and Polybenzoxazole Fibers. Fibers and Polymers, 19, 8, (2018), 1626-1631. DOI: 10.1007/s12221-018-8241-9.

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pISSN : 1229 - 9197
eISSN : 1875 - 0052

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