Flame retardant modification of acrylic fiber with hydrazine hydrate and sodium ions

Zhou, Wanli; Xiang, Yan; Liu, Pengqing; Jiang, Mengjin; Xu, Jianjun

doi:10.1002/app.41996

Cited by 26 publications

(18 citation statements)

References 25 publications

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“…When exposed to a naked flame, the fibers degrade with negligible output of smoke and toxic gases and form stable chars without melting and shrinking. The chief decomposition products of these fibers are CO 2 , H 2 O, and NH 3 with traces of HCN, HCl, and NO 2 …”

Section: Introductionmentioning

confidence: 99%

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Study of flame‐resistant acrylic fibers reinforced by poly(vinyl alcohol)

Zhou

Xiang

Jiang

et al. 2015

J of Applied Polymer Sci

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Acrylic fibers [polyacrylonitrile (PAN) fibers] have excellent flame-retardant properties after they are modified by hydrazine hydrate and metal ions; however, their widespread applications are restricted because of poor mechanical properties. To improve the mechanical properties of these modified PAN fibers, poly(vinyl alcohol) (PVA) was added to the spinning solution of PAN as an effective reinforcing agent. The structure of the fibers before and after modification was studied by Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, and wide-angle X-ray diffraction. The mechanical properties and flame resistance of the fibers after treatment were also tested by a single-fiber tensile tester and a limiting oxygen index (LOI) analyzer, respectively. We found that the LOI of the modified fibers was reduced from 54.7 to 29.1 after the introduction of 50 wt % PVA; however, the tensile strength was dramatically improved from about 1.50 cN/dtex to more than 4.00 cN/dtex. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43006. Recently, we reported a convenient two-step method for obtaining flame-retardant acrylic fibers. 19 With shorter processing procedures, the tensile strength of the fiber was improved slightly. Empirically, to be used in woven form, the tensile strength of the fiber should be above 2.50 cN/dtex. Therefore, it is still necessary to improve the mechanical properties of these metalbased flame-retardant-modified PAN fibers. Because of the

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Section: Introductionmentioning

confidence: 99%

“…Recently, we reported a convenient two‐step method for obtaining flame‐retardant acrylic fibers . With shorter processing procedures, the tensile strength of the fiber was improved slightly.…”

Section: Introductionmentioning

confidence: 99%

Study of flame‐resistant acrylic fibers reinforced by poly(vinyl alcohol)

Zhou

Xiang

Jiang

et al. 2015

J of Applied Polymer Sci

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“…19,21 Similarly, the flame resistance of Cu-PVAg-AN fibers here may be also closely dependent on the content of copper ions. The LOI values of PVA and PVA-g-AN fibers both ranged from 19.5% to 20.0%, indicating that they are quite easy to burn in air.…”

Section: Flame Resistancementioning

confidence: 73%

“…[15][16][17][18][19] These modified PAN fibers decompose with negligible output of smoke and toxic gases, and form stable chars without melting and shrinking when exposed to a naked flame. [15][16][17][18][19] These modified PAN fibers decompose with negligible output of smoke and toxic gases, and form stable chars without melting and shrinking when exposed to a naked flame.…”

Section: Introductionmentioning

confidence: 99%

A novel method to prepare a flame-retardant polyvinyl alcohol fiber with modified acrylonitrile coatings

Zhou

Liu

et al. 2016

RSC Adv.

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To improve the flame resistance of polyvinyl alcohol (PVA) fibers, the well-designed permanent flame-retardant coatings were introduced on the surface of PVA fibers. Acrylonitrile (AN) was firstly grafted on PVA fibers surface and then the grafted fibers (PVA-g-AN fibers) were reacted with hydrazine hydrate and copper sulfate solution to form the coatings with flame retardant performance. The structure of the fibers was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The flame-retardant performance of the fibers was evaluated by limiting oxygen index (LOI) and micro calorimeter (MCC) tests. It was found that the coatings were effective to improve the flame resistance of PVA fibers. SEM photos of char residues and results of TG-IR technique revealed that flame retardance is mainly provided through the barrier action of the coatings with the partial effect of gaseous phase.A novel fiber with PVA substrate and modified PAN coating was constructed, which has favorable tensile strength and flame retardance.

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“…They have also investigated the effects of reagent concentrations and reaction times on degree of chemical modification and fiber properties using Fourier transform infrared spectroscopy and ion‐exchange measurements. In 2015, Zhou and coworkers introduced a new polymer with enhanced flame retardant property by introducing alkali metal (Na+) ion into hydrazine modified PAN fibers . Adsorption behavior of 2,4‐dinitro‐phenylhydrazine (2,4‐DNPH) 27 modified electrospun PAN nanofiber mats 28 were studied by Supaphol and co‐workers .…”

Section: Nitrile Group Modifications In Polymersmentioning

confidence: 99%

An overview of synthetic modification of nitrile group in polymers and applications

Sruthi

Anas

2020

Journal of Polymer Science

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The physicochemical properties of polymers are mainly dependent on the nature of polymer backbone and/or pendant groups linked to the main chain. Therefore, synthetic modification of these functional groups via post functionalization is an important approach for obtaining novel polymeric systems with improved properties and targeted applications. In this context, the synthetic modifications of nitrile group in polymers into various useful functionalities have received considerable attention and several interesting applications of the resulting polymers have been identified. The majority of the studies are based on Polyacrylonitrile (PAN), and some isolated examples of nitrile functionalization in copolymers such as Poly (Styrene-co-Acrylonitrile) (SAN), Poly (Acrylonitrile-co-Butadiene-co-Styrene (ABS) and Nitrile Rubber (NBR) are available. These synthetic modifications are mainly accomplished by the reactions such as Nucleophilic addition, cycloaddition, reduction, and hydrolysis using various reagents. These studies describing the post-polymerization modifications of nitrile group in polymers reported during the last three decades are covered in this review.

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Flame retardant modification of acrylic fiber with hydrazine hydrate and sodium ions

Cited by 26 publications

References 25 publications

Study of flame‐resistant acrylic fibers reinforced by poly(vinyl alcohol)

Study of flame‐resistant acrylic fibers reinforced by poly(vinyl alcohol)

A novel method to prepare a flame-retardant polyvinyl alcohol fiber with modified acrylonitrile coatings

An overview of synthetic modification of nitrile group in polymers and applications

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