Direct fluorination of para-aramid fibers 1: Fluorination reaction process of PPTA fiber

Luo, Longbo; Wu, Pingbo; Cheng, Zheng; Hong, Dawei; Li, Baoyin; Wang, Xu; Li, Xiangyang

doi:10.1016/j.jfluchem.2016.04.002

Cited by 34 publications

(16 citation statements)

References 28 publications

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“…Moreover, a large number of glycidyl-POSS grafted (or self-assembly) on the surface of the fiber, improved the level of roughness after using 2E4MZ, and was critical for the adhesion. Although the value of IFSS in our research was not better than that of the processing of macromolecules grafting on the aramid fiber (increased by 34%) [1,3], the ILSS also increased significantly with the increase of IFSS. The increment of ILSS (25.33%) was much higher than the reports in the literature (14.7%) [23], which showed that the aramid fiber was modified according to our processing of aramid fiber-reinforced composites, which exhibited better properties.…”

Section: Resultscontrasting

confidence: 62%

“…Aramid fiber (AF), also called aromatic polyamide fiber, is a new type of high performance industrial fiber with high modulus, high strength, low density, high temperature resistance, low elongation at a break and low lag loss. However, AF has disadvantages, such as surface smoothness, high crystallinity, and low chemical activity, which result in weak interfacial adhesion between the fiber and matrix materials [1,2,3]. Therefore, the development of novel and effective modification technology, to improve interfacial adhesion, is an issue.…”

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: Resultscontrasting

confidence: 62%

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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“…41 The direct uorination process needs complex reaction conditions. [45][46][47] In a word, some approaches cannot directly achieve surface activation in high-efficiency or high density of functional groups without sacricing the high property or integrity of chemical structure in PPTA ber, while the others needs special reaction technology and can only be achieved under harsh conditions. 48,49 Besides, hot-pressing under appropriate condition has been also demonstrated to signicantly enhance the mechanical properties as well as the insulation properties of PPTA-based papers.…”

Section: Introductionmentioning

confidence: 99%

Toward high-performance poly(para-phenylene terephthalamide) (PPTA)-based composite paper via hot-pressing: the key role of partial fibrillation and surface activation

Dang

Zhao

et al. 2017

RSC Adv.

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“…The obtained fiber was soaked in different concentrations (1,5,9,15,20, and 25 g L À1 ) of PEI solution at room temperature for 6 h and then washed in a Soxhlet extractor overnight in order to remove excess PEI from the fiber surface. Then, the fiber was washed with water and ethanol, then dried at 110 C.…”

Section: Graftingmentioning

confidence: 99%

“…The most widely used physical modification methods include g-ray radiation, 11 plasma modification, 12 and other methods. 13,14 Zheng Cheng explored the chain breakage of poly-p-phenylene-benzimidazoleterephthalamide (PBIA) fibers after fluorination treatment, [15][16][17] and the chelate formed by benzimidazole and copper (Cu) ions has been used in the microelectronics industry. 18 It was found that the amide bond (-CONH-) and benzene ring in PBIA fiber could be the reaction sites.…”

Section: Introductionmentioning

confidence: 99%

Cu (II) coordination modification of aramid fiber and effect on interfacial adhesion of composites

Wang

Yu³

et al. 2018

High Performance Polymers

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In this article, active groups were introduced to the surface of aramid fiber by building a Cu2+ bridge between the aramid fiber and polyethyleneimine (PEI) to improve adhesion in composites between the aramid fiber and the matrix such as epoxy resin. The changes in the structure and properties of the aramid fiber were verified with Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and the single-fiber pull-out test. The FTIR and XPS results show a significant change in the structure and morphology of the aramid fiber after modification. The results of the single-fiber pull-out test show that the interfacial shear strength (IFSS) of epoxy composites reinforced with PEI-grafted aramid fiber increases by 48.8% compared with the IFSS of epoxy composites reinforced with untreated fiber. Thus, the proposed method can improve the interfacial bonding of composites by creating a copper ion bridge between the aramid fiber and PEI.

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Direct fluorination of para-aramid fibers 1: Fluorination reaction process of PPTA fiber

Cited by 34 publications

References 28 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

Toward high-performance poly(para-phenylene terephthalamide) (PPTA)-based composite paper via hot-pressing: the key role of partial fibrillation and surface activation

Cu (II) coordination modification of aramid fiber and effect on interfacial adhesion of composites

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