Surface modification of aramid fibers by amino functionalized silane grafting to improve interfacial property of aramid fibers reinforced composite

The poor interfacial adhesion between the aramid fiber (AF) and the matrix limits the application of the final composites. In this study, a novel coating method was adopted to modify AF Through metallization/grafting reaction, the copolymer synthesized by the low-temperature poly-condensation of p-phenylenediamine (PPDA), 4,4′-diaminodiphenyl ether (ODA) and terephthaloyl dichloride (TPC), was added into the dimethyl sulfoxide/sodium hydride (DMSO/NaH) solution, and a nano AF solution was obtained. Then epoxy groups were introduced to the amide bond by grafting Epichlorohydrin (ECH). By further grafting on Poly (propylene glycol) bis (2-aminopropyl ether) (PEA), more functional groups were introduced, which could increase the polarity of the fiber and the interfacial adhesion of the composites. The results show that not only the interfacial shear strength (IFSS) and the flexural strength of the aramid-reinforced composites has a significant increase compared with the untreated fibers, but the modification still maintains the mechanical properties of the fiber, indicating that building nanoscale coating solution is a very effective method to achieve non-destructive modification to ehance its interfacial adhesion with epoxy resin.

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“…Comparison of IFSS and tensile strength in this work and other work (blue 29 ; green 30 ; yellow 31 ; red 32 ; purple: this work).…”

Section: Resultsmentioning

confidence: 75%

Non-destructive modification of aramid fiber by building nanoscale-coating solution to enhance the interfacial adhesion properties of the fiber-reinforced composites

Wang

Zhang

et al. 2020

Journal of Composite Materials

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“…Recently, aramid fiber, one of the representatives in the high-performance engineered fibers family, has attracted wide attention due to its specific properties with soft texture, low density, high strength, and excellent thermal stability. It has been widely used in the field of aircraft, aerospace, tanks, missile, and so on [31,32]. Poly-p-phenylene terephthalamide (PPTA) fiber is the most common type of aramid fiber.…”

Section: Introductionmentioning

confidence: 99%

Carbonized Aramid Fiber as the Adsorbent for In-Tube Solid-Phase Microextraction to Detect Estrogens in Water Samples

Zhu

Zhang

Liu

et al. 2021

Journal of Chemistry

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Carbonized aramid fiber was prepared as a new type of adsorbent for in-tube solid-phase microextraction. The surface structure, chemical composition, and graphitization degree of the resulted fiber was determined and characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectrometry. The prepared fiber was packed in a stainless-steel tube instead of the sample loop of a six-port and tested for the extraction of five environmental estrogen hormones coupled with high-performance liquid chromatography. Several parameters affecting the estrogens’ extraction including the sampling volume, sampling rate, NaCl content, and desorption time were investigated in detail. The extraction tube with carbonized aramid fiber exhibited remarkable extraction performance towards five estrogen targets. The analysis method was established, and it exhibited a wide linear range (0.5–10.0 μg/L) with good linearity (correlation coefficient ≥0.9906), low limits of detection (0.011–0.13 μg/L), and high enrichment factors (178–1335) for the five analytes. Relative standard deviations (n = 3) for intraday (≤4.8%) and interday (≤4.0%) tests indicated that the extraction material had satisfactory repeatability. Bisphenol A released from a polycarbonate (PC) bottle was quantitatively detected with a concentration of 8.3 μg/L. The relative recoveries spiked at 5 and 10 μg/L were investigated, and the results were in the range of 74.3–121% for real water samples.

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“…[14,15] This versatile surface modification method has significant advantages such as simple ingredients, mild reaction conditions, and applicability to various materials regardless of types, sizes, and shapes. [16][17][18] Furthermore, the polydopamine layer acts as a versatile platform for secondary reactions for further increase of surface activity or functionality. [19][20][21][22] Another aspect is that the dispersion homogeneity extensively influences the composite's performance, especially for the composites of short fiber-reinforced composites, which strongly depends on the surface characteristic of fillers and the processing method.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile dispersion of aramid pulp by matrix sizing agent and reinforced rubber composites

et al. 2020

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The properties of Kevlar fiber-reinforced composites strongly depend on the dispersion homogeneity of the fiber in matrix and their adhesion. Dispersing fibers into a rubber is more challenging than using traditional fillers, especially for aramid pulp (AP) with a highly branched structure. Herein, we reported a facile pre-dispersion method to disperse AP in rubber and to enable efficient reinforcement. AP was firstly modified using dopamine to enhance the surface characteristics, and then the modified AP was dispersed in a solution of nitrilebutadiene rubber (NBR) in ethanol, followed by drying to obtain the AP pre-dispersion. This pre-dispersion was incorporated into NBR by a traditional rubber processing method to produce composites. The measurements of Fourier transform infrared, optical and electric microscopies, X-ray photoelectron spectroscopy, and dynamic mechanical analysis on the composites demonstrate that surface modification using dopamine and the pre-dispersion method obviously improved the AP dispersabiligy and the interfacial interaction between the pulp and NBR, resulting in the enhanced mechanical and oil-resistance properties of the composites.

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Surface modification of aramid fibers by amino functionalized silane grafting to improve interfacial property of aramid fibers reinforced composite

Cited by 50 publications

References 22 publications

Non-destructive modification of aramid fiber by building nanoscale-coating solution to enhance the interfacial adhesion properties of the fiber-reinforced composites

Non-destructive modification of aramid fiber by building nanoscale-coating solution to enhance the interfacial adhesion properties of the fiber-reinforced composites

Carbonized Aramid Fiber as the Adsorbent for In-Tube Solid-Phase Microextraction to Detect Estrogens in Water Samples

Facile dispersion of aramid pulp by matrix sizing agent and reinforced rubber composites

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