Covalent modification of Aramid fibers' surface via direct fluorination to enhance composite interfacial properties

Cheng, Zheng; Li, Baoyin; Huang, Jieyang; Chen, Teng; Liu, Yang; Wang, Xu; Li, Xiangyang

doi:10.1016/j.matdes.2016.05.120

Cited by 67 publications

(35 citation statements)

References 36 publications

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“…The FTIR‐ATR is a characterization technique used to analyze different chemical bonds at the surface of the sample, but the analysis could go beyond the surface layer of fluoride deposition on the aramid fibers. Thus, the C‐F bond from the deposition of fluoride on the aramid was not observed in the FTIR‐ATR bands .…”

Section: Resultsmentioning

confidence: 98%

“…The band intensity at 1,640 cm −1 is related to the stretching vibration of C=O and the intensities at 1,521, 1,398, and 1,319 cm −1 are due to the stretching of C‐N. The bands at 3,050, 1,110, 1,018, 894, 860, 818, and 722 cm −1 are associated with the C‐H bonds of the aromatic ring .…”

Section: Resultsmentioning

confidence: 99%

“…The darker regions represent the areas where the connection with fluoride on the fibers, thus evidencing the presence of C‐F bonds. With the connection of fluoride, grooves and striations are formed on the surface of the fibers, from the polar group C‐F, in order to increase surface reactivity, causing the increase of interfacial adhesion between the fibers and the matrix .…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, aramid fibers exhibit inert and smooth chemical surfaces that lead to poor interfacial adhesion with the polymer matrix. However, various surface treatments for aramid have been reported, varying from chemical methods to plasma, X‐ray radiations and ultrasound .…”

Section: Introductionmentioning

confidence: 99%

“…Interlaminar shear strength has been reported to increase 31% with treatment, related to the presence of polar groups . In another study, surface treatment of the fiber encompassed reaction of fluorine (F 2 /N 2 gas) followed by silanization, yielding up to 46% increase in interlaminar shear strength . However, it is hard to find reports on the treatment of aramid fibers with hydrofluoric acid in compression molded composites with vinyl ester resin.…”

Section: Introductionmentioning

confidence: 99%

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The effect of fluorination of aramid fibers on vinyl ester composites

et al. 2018

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Composite materials are associated with low densities and high mechanical performance, thus favoring protection of personnel, military vehicles and aircrafts. Polyaramid fibers like Kevlar®, are well‐known for their ballistic performance, but their chemically inert and smooth surface hinders interaction with polymeric resins. The objective of this work is to surface treat aramid fibers with fluoride to improve fiber reactivity and interfacial adhesion with a thermoset matrix. The Kevlar®/vinyl ester composites were prepared by compression molding and characterized. Composites with treated fibers had lower void content and higher glass transition temperature, stiffness, storage and loss module. Nevertheless, they showed lower tensile strength, impact strength, damping, and adhesion factors. The treated fiber composites also presented higher adhesion between fibers and matrix, resulting in less chain segment movement and higher energy dissipation. POLYM. COMPOS., 2018. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effect of fluorination of aramid fibers on vinyl ester composites

et al. 2018

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Deep Separation Between In(III) and Fe(III) Ions by Regulating the Lewis Basicity of Adsorption Sites on Electrospun Fibers

Li,

Zhang,

et al. 2023

Adv Funct Materials

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The deep separation between In(III) and Fe(III) ions is considered as an important technological challenge in the engineering fields. The In(III) ions are closer to the soft acid in terms of Lewis acidity due to the smaller polarizability and greater deformability than the Fe(III) ions, which facilitates the possibility of separating them. Herein, the Lewis basicity of the N‐containing adsorption sites is regulated by the fluorine‐containing group to better match with the In(III) ions rather than Fe(III) ions, causing a significant discrepancy in the binding of the adsorption sites to them. Moreover, targeted programmed desorption techniques based on the potential energy differences of the adsorption sites can achieve the deep separation of In(III) and Fe(III) ions, and reach an exceptional concentration of 20.7 mmol L−1 for In(III) ions in the initial desorption solution with extremely high mass ratio (mIn/mFe = 151.7). This work provides a novel technique for in‐depth separation of In(III) and Fe(III) ions from mixed systems, and a new strategy for separating metal ions with similar or close properties.

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Enhanced interfacial adhesion of aramid fiber reinforced rubber composites through bio‐inspired surface modification and aramid nanofiber coating

Zhang

Shao

Liang

et al. 2021

J of Applied Polymer Sci

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In order to improve the interfacial adhesion between aramid fiber (AF) and rubber matrix, a simple and facile method of aramid nanofiber (ANF) coating is demonstrated in this article. Tannic acid (TA) and polyethyleneimine (PEI) are polymerized in an alkaline solution to form a thin TA/PEI (TP) layer that is deposited on the surface of AF to introduce functional groups such as hydroxyl and amino groups. Then, the ANF coating is utilized to construct nanostructures on the surface of AF to improve the interfacial adhesion between the fiber and the rubber. Through hydrogen bonding and/or π‐π stacking between the TP layer and the ANF, the ANF coating is firmly attached to the surface of AF. Compared with the untreated fiber, the interfacial adhesion of AF coated with ANF after 1, 3, 5, 7, 9 deposition cycles is increased by 27.8%, 29.1%, 31.5%, 43.1%, and 30.3%, and the mechanical properties of the fibers remain almost unchanged. This method shows its advantages of simple, facile, and time‐effective, which is of great significance for industrial applications.

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Covalent modification of Aramid fibers' surface via direct fluorination to enhance composite interfacial properties

Cited by 67 publications

References 36 publications

The effect of fluorination of aramid fibers on vinyl ester composites

The effect of fluorination of aramid fibers on vinyl ester composites

Deep Separation Between In(III) and Fe(III) Ions by Regulating the Lewis Basicity of Adsorption Sites on Electrospun Fibers

Enhanced interfacial adhesion of aramid fiber reinforced rubber composites through bio‐inspired surface modification and aramid nanofiber coating

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