Downy feather-like para-aramid fibers and nonwovens with enhanced absorbency, air filtration and thermal insulation performances

Xu, Kangli; Deng, Jixia; Tian, Guangliang; Zhan, Lei; Ma, Jiajia; Wang, Lijun; Ke, Qinfei; Huang, Chen

doi:10.1007/s12274-022-4155-3

Cited by 20 publications

(11 citation statements)

References 58 publications

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“…Para‐aramid fibers are high‐performance fibers composed of highly oriented and rigid poly(terephthaloyl‐p‐phenylenediamine) with strong hydrogen bonding which exhibits considerably high strength and modulus, acid and alkali resistance, durability, flame, and heat resistance 1–5 . Para‐aramid paper, which is normally prepared with aramid chopped fibers (ACFs) and fibrid or pulp fiber by wet papermaking and hot‐pressing, 6–8 is widely used in national defense, aerospace, electromechanical components, automotive parts, high‐temperature fume filtration, and other areas 9–15 .…”

Section: Introductionmentioning

confidence: 99%

Thermal oxygen aging mechanism and assessment of aramid chopped fibers/polyphenylene sulfide composite paper

Xia

Yan

et al. 2023

Polymer Composites

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Aramid chopped fibers/polyphenylene sulfide (ACFs/PPS) composite paper exhibits great potential for application in several cutting‐edge areas because of their excellent comprehensive properties. However, the mechanism underlying thermal aging and the role it plays in the performance of ACF/PPS composite paper remain poorly characterized. Herein, we studied the change in the chemical structure of ACFs/PPS composite paper during thermal oxidative aging and investigated the correlation between the evolution of chromophore/auxochrome groups and the development of color appearance in the ACFs/PPS composite paper. Using the color space theory, we established a correlation model among the degrees of thermal aging, the evolution of color appearance, and the changes in the mechanical properties of ACFs/PPS composite paper. On the basis of this model, the degree of aging and the corresponding mechanical strength of ACFs/PPS composite paper under different conditions could be rapidly received by estimating the change in color factor only. This study sheds new light on elucidates and provides a method for the study of polymer thermal oxidative aging.

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Section: Introductionmentioning

confidence: 99%

Thermal oxygen aging mechanism and assessment of aramid chopped fibers/polyphenylene sulfide composite paper

Xia

Yan

et al. 2023

Polymer Composites

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“…Fire hazards and sudden emergencies involving high temperature and heat radiation are seriously threatening public and social safety. , Thermal protective clothing (TPC) is an effective protection against excessive heat exposure to minimize burn injuries. , At present, thermal insulation is mainly provided by woven or nonwoven fabrics of fire-retardant fibers, such as aramids , and poly( p -phenylene sulfide) (PPS) fibers. , However, these fabrics suffer from inadequate thermal insulation due to the micron-sized fiber diameters (>10 μm) and low porosity (<60%). , Thus, thick insulation layers are commonly required, which inevitably result in problems of hardness in mobility, slow moisture diffusion, and increased extra thermal stress. , …”

Section: Introductionmentioning

confidence: 99%

Hierarchical PBO Nanofiber/PPS Melt-Blown Mats with a Controllable Porous Microstructure for Thermal Protection under Harsh Conditions

Yang

et al. 2023

ACS Appl. Polym. Mater.

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Thermal insulation is critical in protecting against excessive heat exposure to minimize burn injuries. However, the current thermal insulation fabrics are still limited because of their inadequate thermal insulation, poor wearability, and a complicated process. Herein, a fibrous network-confined sol–gel transition strategy is developed to fill poly(p-phenylene benzobisoxazole) nanofibers into poly(p-phenylene sulfide) melt-blown mats. The obtained hierarchical nano/microfiber mats (HNMMs) show typical features of high porosity, a low packing density, small pore sizes, and high thermal stability. Benefiting from the synergistic effect, HNMMs demonstrate low thermal conductivity (0.029 W/mK), outstanding heat resistance (43.7 cal/cm2), high air permeability (115 mm/s), and high water vapor transmission [1568 g/(m2·d)]. The comprehensive performances indicate that such HNMMs have promising potential in personal and industrial thermal insulation in harsh environments.

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“…Compared with the woven filters, the nonwoven filters have higher porosity and more uniform pore size, so they have higher air filtration performance. 5 Commonly, nonwoven filters are processed by electrospinning, meltblowing, and needlepunching nonwoven techniques, where electrospun and meltblown nonwovens have excellent air filtration efficiency due to their fine fiber diameter. 6 However, the high pressure drops and poor mechanical properties of electrospun and meltblown nonwovens limit their application in industrial exhaust gas filtration.…”

Section: Introductionmentioning

confidence: 99%

“…The filtration performance of the fabric filters depends on how the fabrics are processed and the diameter of the fibers. Compared with the woven filters, the nonwoven filters have higher porosity and more uniform pore size, so they have higher air filtration performance . Commonly, nonwoven filters are processed by electrospinning, meltblowing, and needle-punching nonwoven techniques, where electrospun and meltblown nonwovens have excellent air filtration efficiency due to their fine fiber diameter .…”

Section: Introductionmentioning

confidence: 99%

OPPS Fibers with High Temperature Resistance and Excellent Antioxidant Properties by an Oxidation Method

Yang

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Polyphenylene sulfide (PPS) fiber products have been widely used for separation and filtration in harsh environments due to their excellent chemical resistance and relatively economical price. However, the poor temperature and weak oxidation resistance of PPS significantly shorten its service life under high temperature and strong oxidation environments. Herein, we report a type of oxidation-modified PPS (OPPS) fibers with excellent high temperature and oxidation resistance. This is achieved by oxidizing the thioether sulfide groups in PPS molecular chains into sulfoxide and sulfone groups and cross-linking the intermolecular chains. Both experiments and density functional theory (DFT) calculations indicate that hypochlorous acid (HClO) molecules can rapidly oxidize the PPS fiber surface. In addition, molecular dynamics (MD) simulations prove that there are strong hydrogen bonds and van der Waals interactions between HClO molecules and OPPS molecular chains, which promote the penetration of HClO molecules into the interior of the fiber to complete the layer-by-layer oxidation. The prepared OPPS-20 fibers exhibit excellent structural stability under high temperature and strong oxidant environments. Impressively, the OPPS-20 nonwoven filter still exhibits a high dust filtration efficiency of 99.95% after aging at 320 °C for 12 h, and the corresponding pressure drop is 24 Pa. In addition, the OPPS-20 nonwoven filter also maintains excellent filtration performance after aging in 60% HNO3 solution for 12 h, and the filtration efficiency and pressure drop are 99.96% and 29 Pa, respectively. This work demonstrates that the novel OPPS fibers have excellent application prospects in the field of separation and filtration in harsh environments.

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Downy feather-like para-aramid fibers and nonwovens with enhanced absorbency, air filtration and thermal insulation performances

Cited by 20 publications

References 58 publications

Thermal oxygen aging mechanism and assessment of aramid chopped fibers/polyphenylene sulfide composite paper

Thermal oxygen aging mechanism and assessment of aramid chopped fibers/polyphenylene sulfide composite paper

Hierarchical PBO Nanofiber/PPS Melt-Blown Mats with a Controllable Porous Microstructure for Thermal Protection under Harsh Conditions

OPPS Fibers with High Temperature Resistance and Excellent Antioxidant Properties by an Oxidation Method

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