Self-enhancement in aramid fiber by filling free hydrogen bonding interaction sites in macromolecular chains with its oligomer

Yang, Cheng; Wu, Hang; Dai, Yu; Tang, Siyi; Luo, Longbo; Li, Xiangyang

doi:10.1016/j.polymer.2019.121687

Cited by 24 publications

(14 citation statements)

References 26 publications

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“…This is because DA-IPVA sizing liquids penetrate into the paper and the adhesion strength of the paper bers is improved. The cross-linking reaction between IBMA and paper ber and the distance between the bers is reduced to form more hydrogen bond (Yang et al 2019). The macromolecular chains of sizing liquids approach and ketone carbonyl of DA-IPVA reacts with ADH accompanied by dehydration to form hydrazone.…”

Section: In Uence Of Daam Dosage On Surface Roughness Of Da-ipva Sizing Papermentioning

confidence: 99%

Preparation of Modified PVA Copolymer by DAAM/ADH and Cross-Linking Mechanism for Paper

Li¹,

Li²,

Wang³

et al. 2021

Preprint

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Herein, a novel modified polyvinyl alcohol(DA-IPVA) used as sizing agent was prepared by using diacetone acrylamide(DAAM) as graft monomer and N-(isobutoxymethyl)acrylamide(IBMA) as self-cross-linking monomer. The effect of the amount of DAAM on the properties of emulsion, film and sizing paper was discussed. The surface micro-structure of the sizing paper was characterized by SEM and AFM. The addition of DAAM/ADH and IBMA endowed DA-IPVA with cross-linked active group and increased cross-linking density and hydrophobicity after ADH was added into the emulsion and the cross-linking structure was formed. The enhancing mechanism of surface sizing agent for paper was revealed. The DA-IPVA can be cross-linked on the surface and inside of the paper to form a dense network structure, which improves the bonding force between the fibers. When the mole fraction of DAAM of the cross-linking monomer is 8%, the surface sizing performance of the paper is obviously improved compared with the base paper. The dry and wet strength is increased by 266.5% and 334.3% respectively, and the folding resistance is increased 2946.67%. This study can have a profound impact on the development of the technology of cross-linking surface sizing agent for paper.

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Section: In Uence Of Daam Dosage On Surface Roughness Of Da-ipva Sizing Papermentioning

confidence: 99%

Preparation of Modified PVA Copolymer by DAAM/ADH and Cross-Linking Mechanism for Paper

Li¹,

Li²,

Wang³

et al. 2021

Preprint

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“…Such a PANF aerogel would be one suitable choice for the aerogel core. For the skin material, a heterocyclic aramid (HA) has already been known to exhibit more excellent properties than PPTA when the third monomer of 2-(4-aminophenyl)-1 H -benzimidazol-5-amine (APBZ) is properly introduced into the copolymerization. − But, the composite of HA and aerogel of aramid nanofibers has never been seen in the literature according to our knowledge.…”

Section: Introductionmentioning

confidence: 99%

The Aramid-Coating-on-Aramid Strategy toward Strong, Tough, and Foldable Polymer Aerogel Films

et al. 2022

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Aerogel has been much highlighted as an emerging lightweight thermal insulation material, but problems such as fragility, low strength, liquid permeability, and lack of flexibility greatly limit further applications. In this work, a facile aramid-coating-on-aramid (ACoA) method is demonstrated to fabricate all-aramid aerogel composite films for thermal insulation. The method started from the bottom-up synthesis of polymerization-induced para-aramid nanofibers (PANF), which were easily transformed into aerogel films through the vacuum-assisted filtration followed by the freeze-drying techniques. Then, the heterocyclic aramid (HA) solution prepared through the low-temperature-solution polycondensation was used as the coating to be applied onto the PANF aerogel films, and composite films of HA/PANF aerogel were simply achieved with HA contributed to the dense and continuous surface layer. The bulk HA film is of superior mechanical and thermal properties to those of the PANF film. Moreover, reliable interfacial interlocking structures were developed beneath the outermost surface via the interpenetration of the infiltrated HA with PANF network. The comprehensive result was the 15 times enhanced tensile strength, 33 times enhanced fracture toughness, the high thermal decomposition temperature, and the additional flexibility for the foldable films of HA/PANF aerogel. The sealing of the surface macropores greatly suppressed the surface chalking and high water absorption. However, the survival of the tiny pores inside the composite maintained the low enough level of the thermal conductivity to provide effective protections against high temperature not only in air but also under wet or even liquid conditions, suggesting the broader applications for thermal insulation.

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“…High‐performance aromatic polymers (HPAPs), such as aromatic polyamide, polyimide, and polybenzimidazole (PBI), is a kind of special engineering plastics composed of aromatic/heterocyclic rings with excellent mechanical, thermal, and chemical‐resistant properties, which have been widely used in fields of aerospace, automobile, microelectronics, separation membranes, and so on. [ 1–4 ] The main technical challenge of such polymers is their insoluble and unmelting feature because of the rigid backbone and strong intermolecular interactions. Making the polymer segments flexible is the most frequently applied strategy for addressing the processibility issues of HPAPs.…”

Section: Introductionmentioning

confidence: 99%

Super Strong and Tough Polybenzimidazole/Metal Ions Coordination Networks: Reinforcing Mechanism, Recyclability, and Anti‐Counterfeiting Applications

Liu

Huang

Wang

et al. 2021

Macromol. Rapid Commun.

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Nature has provided many delicate strategies for optimizing the structural characteristics of biological materials. One such strategy is the strengthening and toughening of matrix materials by aduandant and hierarchically arranged non‐covalent crosslinking. However, efficient strengthening and toughening of high‐performance aromatic polymers by non‐covalent bonds has rarely been reported yet. Herein, we report the preparation and characterizations of a metal coordination bonds crosslinked polybenzimidazole (PBI) network. By optimizing the synthetic parameters, the strength of copper ion (Cu2+) crosslinked PBI is improved from 87.8 to 218.4 MPa, and the toughness is increased from 19.4 to 111.9 MJ m−3, corresponding to increments of 148.7 % and 476.8 %, respectively, which surpass all previously reported non‐covalent bonds crosslinked high‐performance polymers. PBI with varied chain flexibility are then synthesized to deeply understand the stregnening and toughening mechanism. In addition, the glass transition temperature of PBI is dramatically increased by 75 °C after Cu2+ crosslinking. Moreover, the chemical recycling of PBI from crosslinekd network, and the development of a novel high‐temperature resistant or high‐temperature rewritable anti‐counterfeiting films based on Cu2+ crosslinked PBI are also demonstrated. This study is expected to shed light on design principle for future supramolecularly crosslinked and recyclable high‐performance polymers.

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Self-enhancement in aramid fiber by filling free hydrogen bonding interaction sites in macromolecular chains with its oligomer

Cited by 24 publications

References 26 publications

Preparation of Modified PVA Copolymer by DAAM/ADH and Cross-Linking Mechanism for Paper

Preparation of Modified PVA Copolymer by DAAM/ADH and Cross-Linking Mechanism for Paper

The Aramid-Coating-on-Aramid Strategy toward Strong, Tough, and Foldable Polymer Aerogel Films

Super Strong and Tough Polybenzimidazole/Metal Ions Coordination Networks: Reinforcing Mechanism, Recyclability, and Anti‐Counterfeiting Applications

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