Preparation and Characterization of Para-Aramid Fibers with the Main Chain Containing Heterocyclic Units

Chen, Chaofeng; Xu-yi, Wang; Wang, Fengde; Peng, Tao

doi:10.1080/00222348.2019.1694754

Cited by 9 publications

(8 citation statements)

References 9 publications

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“…The absorption peaks around 2900 cm �1 , associated with aliphatic C-H stretching vibrations and O-H stretching vibrations, are due to viscose which also causes broadening of the peak around 3315 cm �1 . The peaks observed from around 510 to 900 cm �1 correspond to C-H out of plane bending [40][41][42][43]45,46]. As expected from Figure 11, IR spectra of thermal liner, which is an aramid felt quilted to Aramid/Viscose FR nonwoven fabric show characteristic peaks originated from the aramid and viscose fibers as explained in Figures 7 and 8 [40][41][42][43]45].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysissupporting

confidence: 59%

“…The peaks observed from around 510 to 900 cm �1 correspond to C-H out of plane bending [40][41][42][43]45,46]. As expected from Figure 11, IR spectra of thermal liner, which is an aramid felt quilted to Aramid/Viscose FR nonwoven fabric show characteristic peaks originated from the aramid and viscose fibers as explained in Figures 7 and 8 [40][41][42][43]45].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysissupporting

confidence: 59%

“…The absorption peaks around 2900 cm −1 , associated with aliphatic C–H stretching vibrations and O–H stretching vibrations, are due to viscose which also causes broadening of the peak around 3315 cm −1 . The peaks observed from around 510 to 900 cm −1 correspond to C-H out of plane bending [40–43,45,46].…”

Section: Resultsmentioning

confidence: 99%

“…The peaks observed at 1475 cm �1 and 1530 cm �1 (Amide II bands) are attributed to the N-H rocking and C-N stretching vibrations and the peaks at 1237 cm �1 and 1407 cm �1 (Amide III bands) are attributed to the asymmetrical C-N stretching and C ¼ O bending vibrations . The peak at 1080 cm �1 confirmed C-O-C bond stretching while peaks observed from 570 to 856 cm �1 correspond to C-H out of plane bending [40][41][42][43][44].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 99%

See 3 more Smart Citations

Heat and moisture transfer properties of a firefighter clothing with a new fire-resistant underwear

Eryuruk

Gidik

Končar

et al. 2021

Journal of Industrial Textiles

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Under dynamic wear conditions, moisture management and heat transfer behaviour of clothing between the human body and its environment are very important attributes for comfort and performance. Especially considering heavy works like firefighting, it is important to analyse liquid moisture management and thermal comfort properties of fabrics that influence moisture sensation and personnel comfort feeling significantly. This study mainly investigates thermal comfort and moisture management properties of a firefighter clothing with a new fire resistant underwear. Analysing single layer fabric (underwear, outer shell, moisture barrier and thermal barrier) performance properties, together with their three-layered and four-layered combinations gives a better understanding of comfort and protective performance. For characterizing the fabric structures, weight, thickness, FTIR analysis and SEM-EDX tests were conducted. Heat and moisture transfer properties were measured with limited flame spread, thermal resistance (skin model), water vapour transmission rate (dish method), thermal conductivity, air permeability, thermal diffusion, water vapour resistance, moisture management transfer (MMT) and water vapour permeability tests.

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Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysissupporting

confidence: 59%

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysissupporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 99%

See 2 more Smart Citations

Heat and moisture transfer properties of a firefighter clothing with a new fire-resistant underwear

Eryuruk

Gidik

Končar

et al. 2021

Journal of Industrial Textiles

View full text Add to dashboard Cite

show abstract

“…[ 4,5 ] Especially, poly(p‐phenylene‐benzimidazole‐terephthalamide) (PBIA) fibers, a kind of heterocyclic aramid fibers that introduce asymmetric heterocyclic units 2‐(4‐aminophenyl)‐5‐aminobenzimidazole (PABZ) into the poly(p‐phenylene‐terephthalamide) main chains, [ 6–8 ] present superior comprehensive performance than other aramid fibers due to their special chemical structures. [ 6,9 ] Since Kamenskvolokno (Russia) first synthesized PBIA fibers (SVM) in 1970s, several versions of PBIA fibers have been developed subsequently. [ 9 ] The upgrading of products is accompanied by continuous improvement in performances, leading to rapid development of preparation technologies.…”

Section: Introductionmentioning

confidence: 99%

Holey Reduced Graphene Oxide Scaffolded Heterocyclic Aramid Fibers with Enhanced Mechanical Performance

Wen

Xiao

et al. 2022

Adv Funct Materials

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Poly(p‐phenylene‐benzimidazole‐terephthalamide) (PBIA) fibers, a kind of heterocyclic aramid fibers, possess extraordinary mechanical properties and advanced applications in aerospace, military protection, and other civilian areas. However, harsh application scenarios are putting forward even stringent requirements for the mechanical performances and environmental compatibility of PBIA fibers. Strengthening lateral interactions between polymer chains are approachable methods but ongoing challenges to obtain PBIA fibers with high‐performance. This work develops a novel holey reduced‐graphene‐oxide (HrGO)/PBIA composite fiber with a scaffolded structure, in which the HrGO plays a role of clamp to effectively band plentiful PBIA chains through the in‐plane holes. A small amount of HrGO (0.075 wt%) is able to improve the tensile strength and Young's modulus of HrGO/PBIA fibers by 11.5% and 8.3%, respectively. The small amount of well dispersed HrGO improves the crystallinity and serves as the topological constraint that enhances the lateral interaction of the PBIA chains, which is unveiled by the wide‐angle X‐ray scattering and the coarse‐grained molecular dynamics simulations. In addition, the favorable compatibility of HrGO/PBIA fibers in complex application scenarios is demonstrated by the dynamic and cyclic‐loading measurements.

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Carbon Nanotube‐Directed 7 GPa Heterocyclic Aramid Fiber and Its Application in Artificial Muscles

et al. 2023

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Poly(p‐phenylene‐benzimidazole‐terephthalamide) (PBIA) fibers with excellent mechanical properties are widely used in fields that require impact‐resistant materials such as ballistic protection and aerospace. The introduction of heterocycles in polymer chains increases their flexibility and makes it easier to optimize the fiber structure during spinning. However, the inadequate orientation of polymer chains is one of the main reasons for the large difference between the measured and theoretical mechanical properties of PBIA fibers. Herein, carbon nanotubes (CNTs) are selected as an orientation seed. Their structural features allow CNTs to orient during the spinning process, which can induce an orderly arrangement of polymers and improve the orientation of the fiber microstructure, including in the crystalline and amorphous regions. To ensure the complete one‐dimensional topology of long CNTs (∼10 μm), PBIA is used as an efficient dispersant to overcome dispersion challenges. The p‐CNT/PBIA fibers (10 μm‐SWNT 0.025 wt%) exhibit an increase of 22% in tensile strength and 23% in elongation, with a maximum tensile strength of 7.01±0.31 GPa and a reinforcement efficiency of 893.6. The artificial muscle fabricated using CNT/PBIA fibers exhibits a 34.8% contraction and a 25% lifting of a 2 kg dumbbell, providing a promising paradigm for high‐performance organic fibers as high‐load smart actuators.This article is protected by copyright. All rights reserved

show abstract

Preparation and Characterization of Para-Aramid Fibers with the Main Chain Containing Heterocyclic Units

Cited by 9 publications

References 9 publications

Heat and moisture transfer properties of a firefighter clothing with a new fire-resistant underwear

Heat and moisture transfer properties of a firefighter clothing with a new fire-resistant underwear

Holey Reduced Graphene Oxide Scaffolded Heterocyclic Aramid Fibers with Enhanced Mechanical Performance

Carbon Nanotube‐Directed 7 GPa Heterocyclic Aramid Fiber and Its Application in Artificial Muscles

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