The introduction of benzimidazole and ether moieties into poly(<i>p</i>-phenylene terephthalamide): effects on its microstructure, interactions and properties

Xing, Fei; Zhang, Mingjie; Wang, Ziqi; Sun, Guohua; Niu, Hongqing; Wu, Dezhen

doi:10.1039/c9ra07335c

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…The addition of benzimidazole to HPPTA makes the molecular chain more flexible and makes the polymer more soluble in the polymerization solvent, preventing early polymerization as compared to the regular rigid chain of PPTA. Consequently, HPPTA is much more machinable 29,30 . It is worth noting that the HPPTA aerogel can achieve efficient adsorption for anionic dye methyl orange (MO), while its adsorption capacity for cationic dye methylene blue (MB) and neutral dye solvent yellow 2 (SY2) is low.…”

Section: Introductionmentioning

confidence: 99%

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High‐performance heterocyclic para‐aramid aerogels for selective dye adsorption and thermal insulation applications

Song

et al. 2022

J of Applied Polymer Sci

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The high-performance polymer para-aramid (PPTA) is discovered to gel too soon during the polymerization process, resulting in poor processing performance. In this work, a homogeneous polymer solution containing heterocyclic para-aramid (HPPTA) was successfully synthesized by introducing 2,4-aminophenyl-5-aminobenzimidazole groups into the molecular chains of PPTA, and then HPPTA aerogel was prepared using a supercritical drying technique that took advantage of the HPPTA solution's excellent property of slow gelation. When the HPPTA polymer mass fraction was 1 wt%, the aerogel had the lowest density of 0.086 g cm À3 with a BET specific surface area of 376.59 m 2 g À1 . The HPPTA-2 aerogel had better adsorption performance for anionic dye methyl orange, with a maximum adsorption capacity of 319.47 mol g À1 ; however, its adsorption capacity for cationic dye methylene blue and neutral dye dimethyl yellow was very low, at only 19.68 and 0 mol g À1 , respectively. The selective adsorption ability of HPPTA aerogel made it a simple and scalable platform for removing anionic dyes from water solutions. Furthermore, the HPPTA aerogel has outstanding thermal properties for thermal insulation applications in severe environments due to the synergistic effect of the 3D porous structure inside the aerogel and the exceptional thermal stability of the HPPTA.

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Section: Introductionmentioning

confidence: 99%

“…Consequently, HPPTA is much more machinable. 29,30 It is worth noting that the HPPTA aerogel can achieve efficient adsorption for anionic dye methyl orange (MO), while its adsorption capacity for cationic dye methylene blue (MB) and neutral dye solvent yellow 2 (SY2) is low. For this reason, we deeply studied the adsorption mechanism of the aerogel.…”

mentioning

confidence: 99%

High‐performance heterocyclic para‐aramid aerogels for selective dye adsorption and thermal insulation applications

Song

et al. 2022

J of Applied Polymer Sci

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“…27,28 Heterocyclic aromatic polyamides (HAPs) are generally prepared in the dimethylacetamide (DMAc)/LiCl system, which is more conducive to the stability of the synthesized copolymer. 29,30 However, based on the principle of polymerization-induced self-assembly to obtain ANFs, the DMAc/LiCl solvent system is actually not a good choice for the formation of nanofibers. From the perspective of industrial production, it has high cost and complicated aftertreatment.…”

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confidence: 99%

Synthesis of heterocyclic aramid nanofibers and high performance nanopaper

Shi

Tuo

2020

Mater. Adv.

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Preparation of High Strength and Toughness Aramid Fiber by Introducing Flexible Asymmetric Monomer to Construct Misplaced‐Nunchaku Structure

Qiu

Tang

et al. 2021

Macro Materials & Eng

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High performance fibers with high strength and toughness have great potential in composites, but contradiction between tensile strength and elongation at break makes the preparation to become a current challenge. Herein, an asymmetric structure of more flexible diamine, 3,4′‐diaminodiphenyl ether (3,4′‐ODA), is introduced into heterocyclic aramid (PBIA) fibers to replace rigid symmetric p‐phenylenediamine (PDA). By studying the properties of copolymer (mPEBA) fibers with different ratios of diamine, it is found that the mPEBA fiber reached the optimal mechanical properties with the 30% content of 3,4′‐ODA. Compared with homopolymerized heterocyclic aramid fibers, the tensile strength and elongation at break of mPEBA fiber are improved by 26.2% and 38.7%, respectively. Results of X‐ray diffraction show that the introduction of 3,4′‐ODA structure can increase stretchability of mPEBA fibers, improving the orientation degree during hot‐drawing. Molecular dynamics simulations confirm that 3,4′‐ODA structure undergoes a conformation transformation to form a straightened chain during hot‐drawing, while symmetrical 4,4′‐diaminodiphenyl ether (4,4′‐ODA) cannot form the same conformation. The misplaced‐nunchaku structure is formed based on the special meta‐para position of 3,4′‐ODA, achieving the synergy of high strength and high toughness.

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The introduction of benzimidazole and ether moieties into poly(p-phenylene terephthalamide): effects on its microstructure, interactions and properties

Abstract: Co-poly(p-phenylene terephthalamide) fibers containing 4,4′-oxidianiline and 2-(4-aminophenyl)-5-aminobenzimidazole in terephthaloyl chloride and p-phenylene diamine were prepared via a wet spinning method, followed by water washing and drawing at high temperature.

Cited by 5 publications

References 30 publications

High‐performance heterocyclic para‐aramid aerogels for selective dye adsorption and thermal insulation applications

High‐performance heterocyclic para‐aramid aerogels for selective dye adsorption and thermal insulation applications

Synthesis of heterocyclic aramid nanofibers and high performance nanopaper

Preparation of High Strength and Toughness Aramid Fiber by Introducing Flexible Asymmetric Monomer to Construct Misplaced‐Nunchaku Structure

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