Facile preparation of aramid nanofibers from Twaron fibers by a downsizing process

Ifuku, Shinsuke; Maeta, H.; Izawa, Hironori; Morimoto, Minoru; Saimoto, Hiroyuki

doi:10.1039/c4ra06924b

Cited by 52 publications

(31 citation statements)

References 13 publications

(16 reference statements)

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“…XRD patterns for pure aramid and Ar-Zr10 composite film were recorded in Figure 3. The diffraction peaks of the pure aramid showed a crystalline nature with main diffraction peaks at 2θ = 20.6 • , 22.7 • , 28.1 • corresponding to 110, 200, and 004 planes, respectively (Ifuku et al, 2014). The pattern for Ar-Zr10 composite showed the appearance of new additional peaks related to ZrO 2 .…”

Section: Resultsmentioning

confidence: 95%

Aramid-Zirconia Nanocomposite Coating With Excellent Corrosion Protection of Stainless Steel in Saline Media

Nazeer¹,

Al‐Sagheer

Bumajdad

2020

Front. Chem.

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Resistance to stainless steel corrosion in marine-based industries requires more research into materials with an improved surface and enhanced protection by utilizing surface coatings. Herein, a thermally stable aramid-zirconia nanocomposite has been successfully prepared using the sol-gel method to produce a zirconia network-structure bonded to the polymer chain. Using thermal gravimetric analysis (TGA), the residue mass of zirconia retained after the thermal degradation of aramid-zirconia film was determined and found to be 10% by mass. The investigated nanocomposite (using 10% zirconia) was coated on the stainless-steel surface through a facile and effective spin coating method and its protection was examined in saline solution (3.5% NaCl). The aramid-zirconia nanocomposite coating (Ar-Zr10) was found to provide an outstanding corrosion resistance to steel surfaces which led to protecting it against the corrosive marine environment. The electrochemical impedance (EIS) measurements were carried out to evaluate steel resistance against dissolution in chloride solution in the absence and presence of the investigated coatings showed a corrosion protection efficiency of 99.3% using Ar-Zr10 compared to 92.1% using pure aramid. Moreover, the potentiodynamic polarization (PDP) plots showed a pronounced decrease in the corrosion current values which confirmed the formation of a passive layer which mitigated the corrosion reaction and ions diffusion. The water contact angle of stainless-steel coated with pure aramid and the aramid-zirconia was found to be 84.2 • and 125 • , respectively, confirming the hydrophobic nature of the hybrid coating Ar-Zr10. On the other hand, the results achieved through the electrochemical and surface techniques were used to clarify the protection mechanism. The aramid-zirconia nanocomposite coating showed a remarkable protection performance by controlling the charge transfer at the interface between the steel alloy and the electrolyte which prevented the alloy dissolution.

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Section: Resultsmentioning

confidence: 95%

Aramid-Zirconia Nanocomposite Coating With Excellent Corrosion Protection of Stainless Steel in Saline Media

Nazeer¹,

Al‐Sagheer

Bumajdad

2020

Front. Chem.

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“…Similarly, Ifuku et al used mechanical force to promote fiber splitting and obtained ANFs based on alkali treatment. [31] To relieve the problems of long process and time-consuming, there are also some solutions such as ultrasonic treatment and proton donor-assisted deprotonation. [32,33] In order to produce nanofibers more efficiently, in previous work, a totally "bottom-up" approach was proposed to prepare ANFs through a polymerizationinduced self-assembly method.…”

Section: Introductionmentioning

confidence: 99%

The bottom‐up synthesis for aramid nanofibers: The influence of copolymerization

Shi

Qiu

Tuo

2020

J of Applied Polymer Sci

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Aramid based on poly (p‐phenylene terephthalamide) (PPTA) is widely concerned as high‐performance materials. Herein, copolymerized aramid nanofibers (CANFs) were prepared for the first time by a direct bottom‐up polymerization method without additives. Three kinds of third monomers of m‐phenylenediamine, 4,4′‐diaminodiphenyl ether, and 2,5‐dichloro‐1,4‐phenylenediamine were separately copolymerized in PPTA and transformed into nanofiber dispersions in water medium. The characterization results revealed the relationship between the morphology of products and the structure as well as dosages of the different kinds of monomers, which was explained by the influence on conjugate regularities of the PPTA molecules. Furthermore, CANFs were used to build aramid paper blended in pure PPTA nanofibers, and the mechanical and insulation properties of composite paper were improved significantly, which would be of potential use as the new building block for aramid composite materials.

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“…First of all, direct blending has shown to cause phase separation and thus limited mechanical property enhancement as a result of the poor adhesion between aramid fibers and the polymer matrix (Leal et al, 2009;Chen et al, 2012;Sa et al, 2014). Moreover, nanofiber preparation methods such as drawing (Ondarcuhu and Joachim, 1998), templated synthesis (Feng et al, 2002), and electro-spinning (Ramakrishna et al, 2006), are not suitable for aramid nanofibers (ANFs) owing to the inherent inertness of aramid (Ifuku et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Aramid Nanomaterials of Various Morphologies: Preparation and Mechanical Property Enhancement

et al. 2020

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Aramid nanofibers (ANFs) are a novel type of promising nanoscale building blocks for high-performance nanocomposites. Conventionally, ANFs are used to composite with polymers containing polar groups such as-OH and-NH 2 since those polymers can interact with the amide groups in ANFs through polar-polar interaction such as hydrogen bonding. In this study, ANFs were derivatized with non-polar alkyl groups including ethyl, octyl and dodecyl groups and used as a performance-enhancing additive to polyvinyl chloride (PVC) with weak polarity. Interestingly, it was observed that the morphologies of the resulting alkyl-derivatized aramid nanomaterials (R-ANMs) varied significantly including nanofibers, nanobranches, nanosheets, and nanospheres, all of which depended on the degree of substitution (DS) and the chain length of the alkyl group. As an additive, R-ANMs improved the Young's modulus, toughness and yield strength of the PVC films. This study proves the concept that ANFs can be used to composite weakly polar or non-polar polymers.

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Facile preparation of aramid nanofibers from Twaron fibers by a downsizing process

Abstract: We introduce a simple preparation procedure for aramid nanofibers from Twaron fibers by using a downsizing process.

Cited by 52 publications

References 13 publications

Aramid-Zirconia Nanocomposite Coating With Excellent Corrosion Protection of Stainless Steel in Saline Media

Aramid-Zirconia Nanocomposite Coating With Excellent Corrosion Protection of Stainless Steel in Saline Media

The bottom‐up synthesis for aramid nanofibers: The influence of copolymerization

Aramid Nanomaterials of Various Morphologies: Preparation and Mechanical Property Enhancement

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