Transparent and mechanically robust poly (para-phenylene terephthamide) PPTA nanopaper toward electrical insulation based on nanoscale fibrillated aramid-fibers

Lu, Zhaoqing; Si, Lianmeng; Dang, Wanbin; Zhao, Yongsheng

doi:10.1016/j.compositesa.2018.10.009

Cited by 82 publications

(41 citation statements)

References 53 publications

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“…So far, AP has been applied in the eld of specialty/functional and high-performance paper. [19][20][21] Another important application of AP is as a reinforcement in the preparation of polymerbased composites. These composites have been widely used in adhesives, 22 packaging material, 23 thermal insulators, [24][25][26] wind turbine generator blades, 27 tires 28,29 and braking systems.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of aramid pulp/acrylonitrile-butadiene rubber composites

Zhang

et al. 2020

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Preparation and properties of aramid pulp/acrylonitrile-butadiene rubber composites

Zhang

et al. 2020

RSC Adv.

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“…In addition, they have been rotary jet spun from a solution of sulfuric acid yielding fibers in the 500–1000 nm range . Without sulfuric acid, the ability to synthesize dispersions of PPTA nanofibers was developed via deprotonation in dimethyl sulfoxide (DMSO), but isolation from DMSO and/or extrusion of individual aramid nanofibers (ANFs) was not possible due to limited solubility . To build on that approach, a scalable and practical method was developed to electrospin ANFs via side chain substitutions that enhance polymer solubility in organic solvents .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and mechanical properties of para‐aramid nanofibers

Trexler

Hoffman

Smith

et al. 2019

J Polym Sci B Polym Phys

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Scalable, bottom‐up chemical synthesis and electrospinning of novel Cl‐substituted poly(para‐phenylene terephthalamide) (PPTA) nanofibers are herein reported. To achieve Cl‐PPTA nanofibers, the chemical reaction between the monomers was precisely controlled, and dissolution of the polymer into solvent was tailored to enable anisotropic solution formation and sufficient entanglement molecular weight. Electrospinning processing parameters were studied to understand their effects on fiber formation and mat morphology and then optimized to yield consistently high quality fibers. Importantly, the control of relative humidity during the fiber formation process was found to be critical, likely because water promotes hydrogen bond formation between the PPTA chains. The fiber and mat morphologies resulting from different combinations of chemistry and spinning conditions were observed using scanning electron microscopy, and observations were used as inputs to the optimization process. Tensile properties of single Cl‐PPTA nanofibers were characterized for the first time using a nanomanipulator mounted inside a scanning electron microscope (SEM), and fiber moduli measuring up to 70 GPa, and strengths exceeding 1 GPa were achieved. Given the excellent mechanical properties measured for the nanofibers, this chemical synthesis procedure and electrospinning protocol appear to be a promising route for producing a new class of nanofibers with ultrahigh strength and stiffness. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 563–573

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“…In order to improve the mechanical properties of OBCs, with the aim of broadening its applications, two main approaches were used, including blending with homo-polymers and reinforcing by adding fillers. On the one hand, polypropylene (PP), polyethylene with different molecular weight (PE), poly(lactic acid) (PLA), Kevlar, and PP fibers were blended with OBC to enhance its tensile strength [15,16,17,18,19]. On the other hand, various fillers, such as carbon nanotubes (CNTs), graphene, quaternary ammonium salt functionalized grapheme oxide (CTAB-GO), and nanoclay were added into the OBC to nucleate and promote its crystallization kinetics [20,21,22].…”

Section: Introductionmentioning

confidence: 99%

The Influence of DMDBS on Crystallization Behavior and Crystalline Morphology of Weakly-Phase-Separated Olefin Block Copolymer

Zhao

Yao²,

Chang³

et al. 2019

Polymers

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Olefin block copolymer (OBC), with its low hard segments, can form unique space-filling spherulites other than confined-crystallization morphologies, mainly due to its weak phase-separation. In this work, 1,3;2,4-Bis(3,4-dimethylbenzylidene) sorbitol (DMDBS), a well-known nucleating agent, was used to tailor the crystallization behavior and crystalline morphology of OBC. It was found that DMDBS can precipitate within an OBC matrix and self-assemble into crystalline fibrils when cooling from the melt. A non-isothermal crystallization process exhibited an increased crystallization rate and strong composition dependence. During the isothermal crystallization process, DMDBS showed a more obvious nucleating efficiency at a higher crystallization temperature. OBC showed typical spherulites when DMDBS was added. Moreover, a low addition of DMDBS significantly decreased the crystal size, while a large addition of DMDBS induced aggregates, due to the limited miscibility of DMDBS with OBC. The efficient nucleating effect of DMDBS on OBC led to an increased optical transparency for OBC/DMDBS composites.

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Transparent and mechanically robust poly (para-phenylene terephthamide) PPTA nanopaper toward electrical insulation based on nanoscale fibrillated aramid-fibers

Cited by 82 publications

References 53 publications

Preparation and properties of aramid pulp/acrylonitrile-butadiene rubber composites

Preparation and properties of aramid pulp/acrylonitrile-butadiene rubber composites

Synthesis and mechanical properties of para‐aramid nanofibers

The Influence of DMDBS on Crystallization Behavior and Crystalline Morphology of Weakly-Phase-Separated Olefin Block Copolymer

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