Effect of surface treatment on the structure and properties of para-aramid fibers by phosphoric acid

Zhao, Jia

doi:10.1007/s12221-013-0059-x

Cited by 74 publications

(49 citation statements)

References 28 publications

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“…The chemical treatment with phosphoric acid was carried out at dosage of 10 mL 85 % H 3 PO 4 per gram adsorbent, and was agitated for 2 h and left to stand for 24 h at room temperature [24]. The washing procedure is similar to the oxalic acid and citric acid method as mentioned earlier.…”

Section: Pre-treatment Of Adsorbentmentioning

confidence: 99%

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Kooh

Lim

Dahri

et al. 2015

Waste Biomass Valor

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Azolla pinnata (AP), a floating aquatic macrophyte, was studied as a potential adsorbent for the removal of methyl violet (MV) in a batch adsorption system. Surface characterisation, effects of particle size, adsorbent dosage, pH, ionic strength and pre-treatments of adsorbent were carried out. The study of the effects of pH and ionic strength suggested that electronic interaction and hydrophobic-hydrophobic interaction might be the major forces of dye interaction. Pseudo 2nd order kinetic model best-fitted the kinetic data indicating that the adsorption process may be controlled by chemical process. The Weber-Morris and Boyd models were used for describing the diffusion mechanism which showed that intraparticle diffusion was not the rate limiting step, and film diffusion or in combination of other mechanisms might be in control. Isotherm modelling showed that the Langmuir model best-fitted the experimental data with q m of 194.2 mg g -1 at 25°C and 323.4 mg g -1 at 65°C. Thermodynamic studies showed that the adsorption process is endothermic, spontaneous and with significant change to the internal structure of adsorbent. The estimated activation energy by Arrhenius equation is 54.8 kJ mol -1 , which indicates that the adsorption process may be controlled by chemical process. Adsorbent regenerated using NaOH displayed retention of high adsorption capability almost similar to fresh adsorbent even after five consecutive cycles. Ability to regenerate coupled with good adsorption capability suggests that AP has great potential to be utilised as a low-cost adsorbent for the removal of MV in real life application.

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Section: Pre-treatment Of Adsorbentmentioning

confidence: 99%

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Kooh

Lim

Dahri

et al. 2015

Waste Biomass Valor

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“…The mechanical properties of Kevlar fiber treated with 5 wt % CaCl 2 with different time were investigated to study the effect of complexation on fiber breaking strength . The results are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Effect of calcium chloride on the surface properties of Kevlar fiber

Zhou

Luo

et al. 2014

J of Applied Polymer Sci

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In this study, we present a new approach to modify the surface of Kevlar-29 fiber by the complexation. The surface of Kevlar-29 fiber was treated by calcium chloride (CaCl 2 ) ethanol solution. The structure and morphology of the modified Kevlar-29 fiber were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction instrument, atomic force microscopy, and scanning electron microscopy. The results showed that CaCl 2 treatment's method can cause changes of the chemical groups of Kevlar-29 fiber. The amino-groups of Kevlar-29 fiber were freed and the contents of -C-N-increased. The changes can improve the surface roughness of Kevlar-29 fibers. This can increase the adhesive of Kevlar fiber/epoxy composites. From the ILSS and mechanical properties values, it can be concluded that treatment with 5 wt % CaCl 2 for 5 h is the optimum complexation condition.

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“…That is, plasma activation is not durable in surface modification with time [23], and most of these methods are only applicable to laboratory-scale researches but not to an industrial production. Recently, it is reported that phosphoric acid functionalization can effectively increase surface roughness and the content of oxygen-containing polar groups on the surface of para-aramid fiber, which can remarkably enhance the para-aramid fiber/polymer matrix interfacial strength [24][25][26]. However, previous studies tend to focus on the effect PA-treatment on the mechanical properties of para-aramid fiber/resin composite material.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Phosphoric Acid Functionalization of Para-aramid Fiber on the Mechanical Property of Para-aramid Sheet

Zhao

et al. 2018

Journal of Engineered Fibers and Fabrics

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The mechanical properties of para-aramid sheet (PAS) are mainly dependent on the interfacial property between para-aramid chopped fibers and fibrids. However, the chemical inertness and smooth surface of para-aramid chopped fiber lead to the poor interfacial adhesion between para-aramid chopped fibers and fibrids. In this study, para-aramid chopped fiber was treated by phosphoric acid (PA) solution with different concentration in order to prepare PAS with high mechanical strength. It was shown that PA-treatment can increase the surface roughness and improve the surface oxygen-containing active groups of para-aramid chopped fibers. In addition, there is a critical value of PA-concentration (20%). Proper PA-treatment gives rise to an increased tensile strength of PAS from 2.41 to 3.41 kN/m by an increment of 41.49%. However, excessive PA-treatment results in a dramatic reduction of tensile strength for para-aramid fibers and also for PAS possibly due to the structure destruction of para-aramid fiber. This work shows a simple but highly-efficient approach for improving the mechanical property of PAS via PA-treatment of para-aramid chopped fibers, and simultaneously elaborating the reinforcing effects for high-performance PAS especially through optimizing the interfacial property between para-aramid chopped fibers and fibrids.

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Effect of surface treatment on the structure and properties of para-aramid fibers by phosphoric acid

Cited by 74 publications

References 28 publications

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Effect of calcium chloride on the surface properties of Kevlar fiber

The Effect of Phosphoric Acid Functionalization of Para-aramid Fiber on the Mechanical Property of Para-aramid Sheet

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