Simultaneous flow enhancement of high-filled polyamide 66/glass fiber composites

Nanometer-Sized Carbon Black and Fe3O4 Nanoparticles Incorporated into Polyamide-66 Composite Fibers and Woven into Three-Dimensional Fabrics for Electromagnetic Absorption

“…The molecular structures of those composite fibers were further analyzed by FTIR. As shown in Figure f, the absorption peaks of the pristine PA-66 fiber at 3298, 2938, and 2862 cm –1 are attributed to the N–H stretching, the methylene asymmetric stretching, and the methylene symmetric stretching vibration modes, respectively. , The peaks at 1637 and 1537 cm –1 are assigned to the characteristic absorption of amide I and II of the PA-66, respectively. , For the CB-Fe 3 O 4 /PA-66 composite fiber, the characteristic peaks at 1736 and 1401 cm –1 absorption are attributed to CB’s carbonyl stretching vibration and C–H in-plane bending vibration, respectively. , Besides, the infrared absorption peak at 575 cm –1 corresponds to the stretching vibration mode of the Fe–O bond of Fe 3 O 4 . , These results indicated that the carbon black and Fe 3 O 4 nanoparticles were successfully hybridized with PA-66, thus forming the CB-Fe 3 O 4 /PA-66 composite fiber.…”

“…The CB-Fe 3 O 4 /PA-66 fabric was fabricated by a 3D weaving technology based on the above composite fibers. As shown in Figure a, the 3D fabric was designed as a four-layer structure, where the direction of warp ( x ), weft ( y ), and binding warp ( z ) were perpendicular to each other . In this way, better stiffness and strength can be obtained as the inner warp and weft yarns have almost no curl (Figure b) while the z -direction yarns make the multilayer warp and weft yarns tightly bound together (Figure c), suppressing the low fracture toughness and weak interlaminar shear strength of the laminated composites .…”

“…As shown in Figure 3a, the 3D fabric was designed as a fourlayer structure, where the direction of warp (x), weft (y), and binding warp (z) were perpendicular to each other. 25 In this way, better stiffness and strength can be obtained as the inner warp and weft yarns have almost no curl (Figure 3b) while the z-direction yarns make the multilayer warp and weft yarns tightly bound together (Figure 3c), suppressing the low fracture toughness and weak interlaminar shear strength of the laminated composites. 33 As can be seen in Figure 3d, a 3D fabric with a large size of 20 × 20 cm showed good flexibility, bending, and twisting (excellent shape adjustability) capabilities, showcasing the potential in wearable applications.…”

“…As shown in Figure 2f, the absorption peaks of the pristine PA-66 fiber at 3298, 2938, and 2862 cm −1 are attributed to the N−H stretching, the methylene asymmetric stretching, and the methylene symmetric stretching vibration modes, respectively. 25,26 The peaks at 1637 and 1537 cm −1 are assigned to the characteristic absorption of amide I and II of the PA-66, respectively. 27,28 For the CB-Fe 3 O 4 /PA-66 composite fiber, the characteristic peaks at 1736 and 1401 cm −1 absorption are attributed to CB's carbonyl stretching vibration and C−H in-plane bending vibration, respectively.…”

Flexible and customizable three-dimensional woven fabrics using dielectric- magnetic coupled polyamide-66 composite fibers for efficient and controllable electromagnetic wave absorption

“…2e, the infrared absorption peak at 3298 cm -1 , 2938 cm -1 and 2862 cm -1 are attributed to the NH stretching, the methylene asymmetric stretching and the methylene symmetric stretching vibration mode of PA-66, respectively. The infrared absorption peak at 1637 cm -1 is belong to the infrared absorption mode corresponding to PA-66 amide peak I, and the infrared absorption peak at 1537 cm -1 is presumed to to the infrared absorption mode corresponding to PA-66 amide peak II [29]. The fibers contain carbon black and Fe3O4.…”