IR and Raman Spectra of Modern Aramid Fibers

One Surface Treatment, Multiple Possibilities: Broadening the Use-Potential of Para-Aramid Fibers with Mechanical Adhesion

“…This increases frictional forces at the fiber-matrix interface as well as adhesion through mechanical interlocking. The FTIR spectrum (Figure 3) of the washed aramid fibers reveals characteristic peaks for para-aramid at 3312 cm −1 (-NH, hydrogen bond association states), 1637 cm −1 (C=O stretching vibration band of amide), 1537 cm −1 (N-H curved vibration), and 1305 cm −1 (N-H bending vibration) [39][40][41]. Compared to the FTIR spectrum of W-fibers, the hydrogen band peak of MW-fibers has broadened and moved to a lower wavenumber of 3305 cm −1 indicating increased hydrogen bonding at the surface and weakened hydrogen The increased Z-contrast also implies that the nanostructures are mostly carbon-based compounds with traces of iron from ferrocene used in the microwave treatment.…”

“…The FTIR spectrum ( Figure 3 ) of the washed aramid fibers reveals characteristic peaks for para-aramid at 3312 cm −1 (–NH, hydrogen bond association states), 1637 cm −1 (C=O stretching vibration band of amide), 1537 cm −1 (N–H curved vibration), and 1305 cm −1 (N–H bending vibration) [ 39 , 40 , 41 ]. Compared to the FTIR spectrum of W-fibers, the hydrogen band peak of MW-fibers has broadened and moved to a lower wavenumber of 3305 cm −1 indicating increased hydrogen bonding at the surface and weakened hydrogen bonding in the polymer chains of the aramid fiber skin layer [ 40 ].…”

Comparative Study of the Reinforcement Type Effect on the Thermomechanical Properties and Burning of Epoxy-Based Composites

“…The characteristic absorption bands for each fiber may be observed. The complex FTIR spectra of AF consist of as listed prominent absorption bands 3300 cm −1 (N-H stretching), 1638 cm −1 (C=O stretching, Amid I), 1536 cm −1 (coupled C-N stretching and in-plane N-H bending, Amid II), 1400 cm −1 (primary amine salt), 1306 cm −1 (C-C, C-N group motion and N-H vibrations, Amid III), 1103 cm −1 (C-H in-plane bending), 892 (C-H out of plane), 862 cm −1 (C-H out of plane bending), and 725-844 cm −1 (N-H and aromatic C-H out of plane bending) [51][52][53][54]. For both inorganic fillers, i.e., BF and GF, the most distinct wide absorption band with a maximum at 897 cm −1 was originated from SiO stretching mode [55].…”

Experimental analysis of the impact protection properties for Kevlar® fabrics under different orientation layers and non-Newtonian fluid compositions

“…The spectrum corresponding to the standard sample shows transmittance peaks at 1100 cm −1 (C–C and C–N stretch vibration), 1200 cm −1 (vibrations in the plane of C–H, N–H, and C–N), 1355 cm −1 (stretch vibrations in the plane of C–N and C–H), 1404 cm −1 (NH 2 stretch, 1550 cm −1 (bending and stretching of N–H and C–C of the aromatic ring), 1650 cm −1 (stretching vibrations of C=O) and at 3360 cm −1 (N–H stretch) which are the vibration bands originated from the surface of the Kevlar® standard sample. 36–38 In the other spectra (C1, C2, and C3), the transmittance peak at 1100 cm −1 is derived from the strong and wide asymmetric and symmetrical vibration of Si–O–Si stretching (siloxane) bonds and also at 2850 and 2944 cm −1 show the stretch of C–H and CH 3 , and C–H and CH 2 , originated by the APTES silane agent and PEG dispersant. 31,33

Figure 6.FTIR of the samples (Standard, C1, C2, and C3).

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“…Also, the distribution of the nanoparticles and interaction between the nanoparticles and filaments play a fundamental role in the determination of the impact strength characteristics of the samples C1, C2 and, mainly, C3. [31][32][33][34][35] Figure 6 shows the FTIR spectrum of the Kevlar Õ fabric samples impregnated with STF (C1, C2, and C3) and the Kevlar Õ sample non-impregnated (standard) Table 2 summarizes the main peaks obtained. The spectrum corresponding to the standard sample shows transmittance peaks at 1100 cm À1 (C-C and C-N stretch vibration), 1200 cm À1 (vibrations in the plane of C-H, N-H, and C-N), 1355 cm À1 (stretch vibrations in the plane of C-N and C-H), 1404 cm À1 (NH 2 stretch, 1550 cm À1 (bending and stretching of N-H and C-C of the aromatic ring), 1650 cm À1 (stretching vibrations of C¼O) and at 3360 cm À1 (N-H stretch) which are the vibration bands originated from the surface of the Kevlar Õ standard sample.…”