Properties of Aramid Fibers And Their Composites Based on Atomic/Molecular Scale Simulation Technology: A Review

Xu, Jingli; Shu-hu, LI; Guo, Jianfen; Haiyan, Z.; Zhang, Jianqin; Zhang, Haiyun; Wang, Danyong; Chen, Yiwei

doi:10.1088/1742-6596/2478/4/042008

Cited by 2 publications

(3 citation statements)

References 33 publications

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“…Rigid polymer chains crystallize more easily and arrange themselves more easily during spinning, thanks to which the obtained fibers have a very ordered microstructure. The most famous aramids from the para-aramid group (poly(terephthaloyl terephthalamide, PPTA) is poly(phenylene-1,4-diamide) (known as Kevlar), and from the meta-aramid group (PMTA) is poly(phenylene-1,3 -diamide) (known as Nomex) [48][49][50][51]. Single Kevlar fibers tested in laboratory conditions have a tensile strength of 3620 MPa.…”

Section: Discussionmentioning

confidence: 99%

“…Generally speaking, aramids are also substances that are very resistant to most chemicals, such as acids, bases and solvents. However, they degrade due to the action of ultraviolet rays, which is why they are rarely used outdoors without protection against sunlight [48][49][50][51]. The aramid bond is characterized by hydrophilicity, which leads to the absorption of moisture by all aramids.…”

Section: Discussionmentioning

confidence: 99%

“…For example, at a temperature of 20 °C and a relative humidity of 55%, the Kevlar 149 module (Density 1.47 g/cm 3 , Tenacity 18) absorbs moisture at a level of ~1 %, while the Kevlar 29 (Density 1.43 g/cm 3 , Tenacity 20-23 ) at the level of ~7 % [51]. Aramid fibers also easily absorb hydrophobic substances, such as paraffin [48][49][50][51][52]. For this reason, aramid fibers are used in the processes of sorption and extraction of PAHs from solutions [52,53].…”

Section: Discussionmentioning

confidence: 99%

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Fire-Resistant Fabrics for Special Applications – Analysis of Results

Rabajczyk,

Gniazdowska,

Stojek

et al. 2024

Preprint

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Fires constitute a significant threat due to the pollutants emitted and the destruction they cause. People who take part in fire-fighting operations must be equipped with appropriate tools, including special clothing that will allow them to work and guarantee safety. One of the threats are compounds from the PAH group, which are characterized by high toxicity and carcinogenicity. Therefore, it is important that the materials used constitute a barrier to contamination. Various materials from which individual elements of special firefighter's clothing are made were tested. Additionally, the importance of height on the possibility of sorption of PAH compounds on a given type of material was analyzed. Based on the results obtained, it was found that the type of material and the zone in which the clothing items are used are important in the sorption processes of pollutants. Data in this area may be important for taking further actions regarding the modification of materials used in special fire brigade clothing and in their cleaning processes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Fire-Resistant Fabrics for Special Applications – Analysis of Results

Rabajczyk,

Gniazdowska,

Stojek

et al. 2024

Preprint

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Composites based on polymeric blends reinforced with TiO₂ modified aramid fibers

Pelin,

Sonmez,

Pelin

et al. 2024

Polymer Composites

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The paper presents a study on composites based on 50:50 (PP:LLPE‐g‐MA) reinforced with 0.5, 1, and 2 wt% aramid fibers unmodified/modified with TiO2, processed by melt compounding. Micronic aramid fibers were acetone washed to remove impurities and treated with Ti(IV)isopropoxide precursor via sol–gel method, adding microcellulose for TiO2 particle dimension control. Composites were hot‐pressed into 4 mm‐thick plates for sampling and 0.5 mm‐thick sheets for thermoforming. All composites were successfully thermoformed, fibers‐based samples showing improved thermoforming ability without wrinkling. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Energy dispersive X‐ray spectroscopy (EDS) analysis confirmed the formation of TiO2 particles on the fiber surface. Optical microscopy, SEM and FTIR analysis exhibit the fibers' strong embedment into the matrix due to physical interlocking, generating surface defect reduction. Water absorption decreased from 0.195% (control) to 0.075 and 0% for 1 TiO2 and 2 TiO2 samples, due to material compactization. Contact angles increased from 95.18° (Control) to 108° (1 TiO2) and 112.89° (2 TiO2). The highest flexural strength and modulus were exhibited by 1 TiO2 sample that increased by 44.88% and 47.6% compared to the control sample, due to higher intrinsic rigidity of fibers and TiO2 modifying surface rugosity and phase interaction. The impact strength of the control sample improved by 139% compared to PP due to brittleness reduction, 1 TiO2 by 209% compared to PP, 29% compared to the control sample. The results and excellent thermoformability recommend the materials for encapsulation of electronic/expensive parts in automotive or drone applications, offering viable, facile, rapid, and cost‐effective solutions to easily replace damaged parts.Highlights Aramid fibers were successfully modified using isopropoxide precursor; Strong embedment of fibers in the polymer diminishes crack propagation/damage; Improved impact and bending properties and water contact angle; The composites showed a high ability to thermoform into complex shapes; Potential to replace non‐reusable materials as encapsulation solutions.

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Properties of Aramid Fibers And Their Composites Based on Atomic/Molecular Scale Simulation Technology: A Review

Cited by 2 publications

References 33 publications

Fire-Resistant Fabrics for Special Applications – Analysis of Results

Fire-Resistant Fabrics for Special Applications – Analysis of Results

Composites based on polymeric blends reinforced with TiO₂ modified aramid fibers

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Properties of Aramid Fibers And Their Composites Based on Atomic/Molecular Scale Simulation Technology: A Review

Cited by 2 publications

References 33 publications

Fire-Resistant Fabrics for Special Applications – Analysis of Results

Fire-Resistant Fabrics for Special Applications – Analysis of Results

Composites based on polymeric blends reinforced with TiO2 modified aramid fibers

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Product

Resources

About

Composites based on polymeric blends reinforced with TiO₂ modified aramid fibers