Hydrophilicity modification of aramid fiber using a linear shape plasma excited by nanosecond pulse

Yuan, Hao; Wang, Wenchun; Yang, Dezheng; Zhou, Xiongfeng; Zhao, Zhiyao; Zhang, Li; Wang, Sen; Feng, Jing

doi:10.1016/j.surfcoat.2018.03.057

Cited by 46 publications

(18 citation statements)

References 30 publications

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“…One was a physical method [4,5], and the other was chemical modification. The commonly used chemical modification methods include surface grafting [6,7], surface modification by plasma [8,9], and ultrasonic infiltration [10]. The surface coating as a physical method has been widely used because of simple equipment and convenient operation.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the high crystallinity on the surface layer of AF, it is difficult for glycidyl-POSS to penetrate into the surface layer of the fiber. Supercritical carbon dioxide (scCO 2 ) not only has great solubility and permeability, but also has a relatively high diffusion coefficient, which caused the polymers and fibers to bulge [8,12]. The study on AF modification in scCO 2 processing by an interfacial reaction between glycidyl-POSS and the polar groups on AF surface has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

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Study on Surface Properties of Aramid Fiber Modified in Supercritical Carbon Dioxide by Glycidyl-POSS

Luo

Yang

et al. 2019

Polymers

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The outstanding diffusivity and permeability of supercritical carbon dioxide (scCO2) are extremely beneficial for grafting reaction. In this work, aramid fibers (AF) are modified in scCO2 by glycidyl-polyhedral oliomeric silsesquioxane (POSS) with 2-ethyl-4-methylimidazole (2E4MZ) on the basis of cleaning with acetone. The surface morphology and chemical structure of the modified AF were measured and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM), Thermogravimetric (TG), and Atomic force microscope (AFM). The interfacial shear strength (IFSS) was measured by a micro-bond pull-out test, then the modified AF/EP composites were prepared and the interlaminar shear strength (ILSS) was characterized. Research has shown that some of the glycidyl-POSS molecular chains permeated into the surface of the fiber and grafted onto the surface of the AF after modification, and the other glycidyl-POSS self-assembled on the surface of the fiber. XPS indicated the introduction of C–O and –COO–, which confirmed the existence of chemical reactions between AF and glycidyl-POSS. AFM and SEM images revealed that 2E4MZ, not only promoted the grafting reaction of glycidyl-POSS, but also intensified the self-assembly of glycidyl-POSS, both of which increased the roughness of the fiber. A monofilament tensile test and micro-bond pull-out test showed that there was a negative effect on the tensile strength after scCO2 processing. The tensile strength of modified AF, with glycidyl-POSS, increased the highest strength of 25.7 cN dtex−1, which was 8% higher than that of pristine AF. The improvement of ILS roughness and the polar chemical groups produced in grafting reaction. These results indicated that AF, treated in scCO2, with glycidyl-POSS, which is a suitable way of fiber modification, can significantly improve the surface adhesion of AF reinforced composites.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Surface Properties of Aramid Fiber Modified in Supercritical Carbon Dioxide by Glycidyl-POSS

Luo

Yang

et al. 2019

Polymers

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“…Therefore, high energy efficiency, excellent thermal stability, and good discharge plasma distribution can be reached in nanosecond pulsed dielectric barrier discharge (NPDBD) [3,4]. Moreover, some applications have been widely exhibited in volatile organic compounds (VOCs) removal [5], sewage treatment [6,7], polymer modification [8,9], aerospace [10], biomedical [11], etc. More recently, the nanoparticles, such as silver [12], carbon [13], and cobalt [14], have been synthetized by NPDBD.…”

Section: Introductionmentioning

confidence: 99%

Discharge Regimes Transition and Characteristics Evolution of Nanosecond Pulsed Dielectric Barrier Discharge

et al. 2019

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Discharge regime transition in a single pulse can present the breakdown mechanism of nanosecond pulsed dielectric barrier discharge. In this paper, regime transitions between streamer, diffuse, and surface discharges in nanosecond pulsed dielectric barrier discharge are studied experimentally using high resolution temporal–spatial spectra and instantaneous exposure images. After the triggering time of 2–10 ns, discharge was initiated with a stable initial streamer channel propagation. Then, transition of streamer-diffuse modes could be presented at the time of 10–34 ns, and a surface discharge can be formed sequentially on the dielectric plate. In order to analyze the possible reason for the varying discharge regimes in a single discharge pulse, the temporal–spatial distribution of vibrational population of molecular nitrogen N2 (C3Πu, v = 0,1,2) and reduced electric field were calculated by the temporal–spatial emission spectra. It is found that at the initial time, a distorted high reduced electric field was formed near the needle electrode, which excited the initial streamer. With the initial streamer propagating to the dielectric plate, the electric field was rebuilt, which drives the transition from streamer to diffuse, and also the propagation of surface discharge.

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“…Liu et al [6] modified the aramid fiber surface properties by using the Friedel-Crafts reaction and found that this method can increase the number of active groups on the fibers without reducing the tensile strength of the fibers. More recently, surface coating [7,8], coupling-agent modification [9], and fluorination modification [10] have also been used to improve the surface activity of the aramid fibers. Enhanced surface activity promotes the dispersion of aramid fibers in water and improves the evenness of aramid paper to some extent.…”

Section: Introductionmentioning

confidence: 99%

On the Network Strength of Meta-Aramid Fiber Suspension and Its Relationship to Formation

Sha

Gao

Wang

et al. 2022

Advances in Polymer Technology

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Because of poor surface hydrophilicity, meta-aramid fibers readily form flocs by intertwining or interlacing, and this severely affects the uniformity of meta-aramid paper. To investigate the flocculation mechanism of meta-aramid fiber suspensions, the critical flocculant concentration, shear, and compressive network strength of meta-aramid fiber suspensions were examined. A hand sheet former was used to study the influence of the yielding properties of suspensions on the uniformity of meta-aramid paper, and the relationship between the formation index and rheological properties was determined. The results showed that the critical gel concentration ranged from 0.37 to 0.68 g/L, which was much lower than that of plant fiber suspensions. In addition, the compressive yield stress ( P y ) and shear yield stress ( τ y ) of the meta-aramid fiber suspensions were found to increase linearly and exponentially, respectively, with an increasing concentration, and the uniformity index of the paper sheets was found to depend on a power of τ y ⋅ P y . This provides an effective method for predicting paper sheet uniformity.

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Hydrophilicity modification of aramid fiber using a linear shape plasma excited by nanosecond pulse

Cited by 46 publications

References 30 publications

Study on Surface Properties of Aramid Fiber Modified in Supercritical Carbon Dioxide by Glycidyl-POSS

Study on Surface Properties of Aramid Fiber Modified in Supercritical Carbon Dioxide by Glycidyl-POSS

Discharge Regimes Transition and Characteristics Evolution of Nanosecond Pulsed Dielectric Barrier Discharge

On the Network Strength of Meta-Aramid Fiber Suspension and Its Relationship to Formation

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