Porous structure of polysulfonamide fibres

Sokira, A. N.; Efimova, S. G.; Щетинин, А. М.; Frenkel, G; Iovleva, M. M.

doi:10.1007/bf00546091

Cited by 6 publications

(6 citation statements)

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“…The macrostructure of PSA fibers such as cross‐section, defects, pores, or densification has attracted much attention. However, the micro‐nano structures (e.g., fibrils, crystal structure) of these fibers have not been fully explored …”

Section: Introductionmentioning

confidence: 99%

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

Tian

Chen³

et al. 2015

J of Applied Polymer Sci

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The structure and performance changes of aromatic copolysulfonamide (co-PSA) fibers that occurred during wet spinning process have been studied. While using different length scale characterization, including scan electron microscopy (SEM), wide-angle X-ray scattering (WAXS), and small-angle X-ray scattering (SAXS), it was found that the molecular chains of co-PSA formed an isotropic network during coagulation which further lead to extension and orientation of these chains during the subsequent stretching. As a result, only after heat stretching and heat setting the molecular chains tended to pack into crystal lattice in the fibrils. This gave rise to a much denser structure along the spinning line and the glass transition temperature of co-PSA fibers increased a little after heat setting. Before heat stretching, the co-PSA fibers were in amorphous state, and only the amorphous orientation was observed within the fibers. After heat stretching at the temperature higher than T g , the fraction of amorphous region decreased, and the crystal structure formed in the fibers, which became more perfect during heat setting. The structure development during spinning process contributed toward the improvement of thermo-mechanical stability, tenacity and modulus of the co-PSA fibers. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42343.

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Section: Introductionmentioning

confidence: 99%

“…and Muraveva and Konkin also investigated the influence of precipitation conditions on the structure and property of pt ‐PSA and poly (3,3′‐diphenylsulfonyl terephthalamide) ( mt ‐PSA) fibers prepared by wet spinning. Sokira et al . investigated the porous structure changes of PSA fibers during spinning process.…”

Section: Introductionmentioning

confidence: 99%

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

Tian

Chen³

et al. 2015

J of Applied Polymer Sci

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“…In addition to the α transition, a sub‐glass transition ranging from 100 to 250 °C is observed for pre‐drawn co ‐PSA fibers; however, it does not appear for heat‐drawn co ‐PSA fibers. As we know, a porous structure of fibers is inevitable in the wet‐spinning process, which leads to weak interactions between molecular chains in pre‐drawn fibers, and therefore provides enough space for the motion of small segments like side and end groups. In the subsequent heat‐stretching process, the ordering of the structure and intermolecular interactions in the amorphous region increase, suggesting an increase in molecular packing density.…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, research on the spinning process as well as the properties and structures of PSA fibers has been insufficient. Many efforts have been focused on exploring the effect of the coagulation conditions during the wet‐spinning process, such as coagulation bath composition and temperature, on the porous structure and mechanical behavior of PSA fibers or films . Only few reports have referred to the structural changes of PSA fibers during the spinning process.…”

Section: Introductionmentioning

confidence: 99%

Morphology and structure changes of aromatic copolysulfonamide fibers heat‐drawn at various temperatures

Wang

Yang

et al. 2014

Polymer International

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“…Hitherto, extensive studies have been carried out on the optimization of spinning process during the formation of PSA fibers in order to improve their performance . In fact, the utility of fibers is also an important issue that worth full concern, because it is likely that while in use, the fibers will be exposed to their relative utility environments (e.g.…”

Section: Introductionmentioning

confidence: 99%

Performance and structure changes of the aromaticco‐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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Porous structure of polysulfonamide fibres

Cited by 6 publications

References 1 publication

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

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

Morphology and structure changes of aromatic copolysulfonamide fibers heat‐drawn at various temperatures

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

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