Structure and property development of aromatic copolysulfonamide fibers during wet spinning process

Yu, Jinchao; Tian, Feng; Chen, Shenghui; Zhang, Yumei; Wang, Huaping

doi:10.1002/app.42343

Cited by 11 publications

(8 citation statements)

References 20 publications

(32 reference statements)

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“…In general, the greater the mechanical properties, the lower the elongation at break. This situation is similar to the fracture behaviors of other types of fibers reported in many literature studies [32,33,34,35,36,37].…”

Section: Resultssupporting

confidence: 90%

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

et al. 2019

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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.

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Section: Resultssupporting

confidence: 90%

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

et al. 2019

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“…The analysis for the microstructural changes of the thermal‐oxidative aging co ‐PSA fibers at large scale was done by SAXS as shown in Figure . According to previous studies, the equatorial streak of small‐angle diffuse scattering for heat‐drawn co ‐PSA fibers is generally attributed to the presence of fibrils elongated along the fiber axis. Therefore, the average length and misorientation angle Bϕ of fibril can be determined by the method of Ruland, as shown in Figure .…”

Section: Resultsmentioning

confidence: 85%

“…The sample‐to‐detector distances for WAXS and SAXS were 236.49 mm and 1,790 mm, respectively. All data analysis (background correction, radial, and azimuthal integration) was carried out using the Xpolar software (Precision works NY) as reported in our previous paper …”

Section: Methodsmentioning

confidence: 99%

Performance and structure changes of the aromatic co‐polysulfonamide fibers during thermal‐oxidative aging process

Chen

et al. 2016

J of Applied Polymer Sci

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The changes in performance during thermal-oxidative aging process of the aromatic co-polysulfonamide (co-PSA) fibers over a broad temperature range from 250 8C to 320 8C have been investigated. In addition, the mechanism of thermal-oxidative aging process has been studied by using structural information obtained from the fibers at varying length scales. The results showed that a significant reduction in tensile strength was observed compared with that of initial modulus during aging process. Macroscopically, thermal-oxidative aging mainly causes color changes of fibers and thermally induced macro defects begin to appear only at 320 8C for 100 h. On a micro level, the crystal structure of fibers remained stable and did not show significant changes expect that aging at 320 8C. In addition, thermo-degradation as well as crosslinking has been observed primarily in amorphous region. With the increase of temperature and time duration, the crosslinking became more dominant and crosslinking density increases. Correspondingly, the fibril length decreases due to degradation and then increases due to the formation of crosslinked structures within the fibers. The results suggest that molecular degradation is the main cause of strength loss and the formation of crosslinking structure within the fibers contributes to the retention of modulus and improvement of creep resistance. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44078.

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“…7,8 Yu et al. employed heat stretching at temperatures above the glass transition temperature ( T g ), 9 during which crystal structures can be created leading to improved thermal stability and mechanical properties. In order to increase the mechanical strength, Li et al.…”

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confidence: 99%

“…To further improve the performance of PSA fibers, a lot of researchers have made great efforts to investigate the effect of the spinning process on its structure and resultant performance. 7,8 Yu et al employed heat stretching at temperatures above the glass transition temperature (T g ), 9 during which crystal structures can be created leading to improved thermal stability and mechanical properties. In order to increase the mechanical strength, Li et al prepared the all paraposition PSA fibers, 1 which showed better mechanical properties than common ones.…”

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The fire retardant properties and pyrolysis mechanism of polysulfonamide (PSA) fibers

Zhang

Tang

Wang

et al. 2017

Textile Research Journal

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In the present work, the fire retardant properties and pyrolysis mechanism of polysulfonamide (PSA) fibers were investigated by cone calorimetry, scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), and pyrolysis-gas chromatography-mass spectrometry. The fire retardant behaviors were reflected by the cone calorimeter data under heat fluxes of 35, 50, and 75 kW/m 2 . This demonstrated that, when exposed to higher heat flux, PSA fibers were ignited easier and burned more completely, indicated by lower time to ignition and higher peak heat release rate. It was further confirmed from the morphology of the residual chars that the original fiber shape can be kept at lower heat flux, but it changed into coherent carbonaceous chars with holes at higher heat flux. In comparison of the FTIR spectra of raw fibers with residual chars, it was noticed that upon heating, the amide linkage was more liable to be broken than that of sulfone groups. Additionally, with elevated heat flux, most of the absorption bands vanished and transformed into the typical feature of carbonaceous material. The pyrolysis products showed that some volatile products with small molecular weight, such as benzene, benzonitrile, and aniline, can be created at high temperature, which can be easily ignited. With this research, the fire retardant properties of PSA fibers are revealed and the corresponding pyrolysis mechanism is proposed, which can guide its application in practice.Polysulfonamide (PSA) fibers, with superior temperature resistance, high limiting oxygen index (LOI, up to 33%), and excellent chemical properties, were first developed by Shanghai Tanlon Fiber Co, Ltd (China) with the trademark Tanlon Õ . They belong to the fiber series of aromatic polyamides with conjugated aromatic rings and sulfonyl groups in the main backbone, which endow them with outstanding thermal stability and excellent chemical properties. 1 These unique features enable them to be applied in various fields, such as flame retardant protective clothing, high temperature filtration materials, thermal insulation materials, battery membrane, and so on. [2][3][4][5][6] With excellent fire retardant properties, PSA has attracted much attention in both industrial and academic circles, including further performance improvement, extension of practical applications, thermal stability, etc. To further improve the performance of PSA fibers, a lot of researchers have made great efforts to investigate the effect of the spinning process on its structure and resultant performance. 7,8 Yu et al. employed heat stretching at temperatures

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Structure and property development of aromatic copolysulfonamide fibers during wet spinning process

Cited by 11 publications

References 20 publications

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

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

Performance and structure changes of the aromatic co‐polysulfonamide fibers during thermal‐oxidative aging process

The fire retardant properties and pyrolysis mechanism of polysulfonamide (PSA) fibers

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