Microvoids in aramid-type fibrous polymers

Dobb, M. G.; Johnson, D. J.; Majeed, Aasim; Saville, B.P.

doi:10.1016/0032-3861(79)90157-5

Cited by 99 publications

(69 citation statements)

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“…Aviakan [68] and Ballou [69) have interpreted the transverse structures observed in plasma etched fibers as arising from these pleated sheets and they claim to have observed a "long" period by soft x-ray scattering at small angles. Their data have, however, not been published and the intense SAXS microvoid scatter and lack of discrete meridional scattering observed from CuKa x-rays by Dobb et al [47] and this author (Chapter V) is inconsistent with this interpretation and suggests the need for additional work in this…”

Section: )mentioning

confidence: 85%

Structural Investigations of Fibers and Films of Poly(p-phenylene benzobisthiazole). Volume 1

Minter¹

1982

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Section: )mentioning

confidence: 85%

Structural Investigations of Fibers and Films of Poly(p-phenylene benzobisthiazole). Volume 1

Minter¹

1982

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“…Grujicic et al's length- Figure 28. Micrographs of longitudinal sections through stained Kevlar 29 [60] . scale levels are summarized in Table 3.…”

Section: Ppta Computational Modellingmentioning

confidence: 99%

“…The dark regions shown in Figure 28 are locations of microvoids in Kevlar 29 stained by silver sulphide (Ag 2 S). The reduction in the SAXS intensity notified the presence of moisture in the voids [57][58][59][60] . Grujicic et al 56,61 reported that the insertion of molecular nitrogen will cause voids.…”

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confidence: 99%

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Microstructural developments of poly (p-phenylene terephthalamide) fibers during heat treatment process: a review

et al. 2014

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Poly (p-phenylene terephthalamide) fibers prepared by wet or dry-jet wet spinning processes have a notable response to very brief heat treatment (seconds) under tension. The modulus of the as-spun fiber can be greatly affected by the heat treatment conditions (temperature, tension and duration). The crystallite orientation and the fiber modulus will increase by this short-term heating under tension. Poly (p-phenylene terephthalamide) fibers have a very high molecular orientation (orientation angle 12-20°). Kevlar  and Twaron  fibers are poly (p-phenylene terephthalamide) fibers. This review reports for PPTA fibers the heat treatment techniques, devices and its process conditions. It reports in details the structural relationships between the fiber properties which are influenced by the heat treatment process. In particular, focused deeply on the effect of the crystal structure and the morphology of the fibers on the mechanical properties of PPTA fibers.

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“…Nevertheless, the anisotropic Guinier analysis is still valid so the limiting slope at small angles ( 2 nsRg < 1.5) has been measured and the projected radii of gyration are given in Table 6. All the films examined were processed from PPA The void radius in the Kevlar 49® sample calculated assuming ellipsoidal voids was about 3 times larger than reported by Dobb et al [64]. This must be due to difference in commercial samples or angular ranges used.…”

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confidence: 80%