通过静电纺丝制备微孔聚酰亚胺纳米纤维：静电纺丝参数和盐添加的影响,Materials & Design

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通过静电纺丝制备微孔聚酰亚胺纳米纤维：静电纺丝参数和盐添加的影响
Materials & Design ( IF 7.6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.matdes.2020.109280
Fuat Topuz , Mahmoud A. Abdulhamid , Tibor Holtzl , Gyorgy Szekely

摘要高性能聚酰亚胺 (PI) 的静电纺丝最近引起了人们的极大兴趣。在这项研究中，我们探索了静电纺丝参数——即聚合物浓度、电压、尖端到收集器的距离和流速——以及盐的添加对静电纺 PI 纳米纤维的直径、形态和可纺性的影响。通过 4,4'-（六氟异亚丙基）的缩聚反应合成了三种不同的本征微孔率 (PIM-PI) 聚酰亚胺和两种微孔聚酰亚胺，其高布鲁诺-埃米特-特勒 (BET) 范围为 270 至 506 m2 g-1二邻苯二甲酸酐 (6FDA) 和芳香族二胺。四乙基溴化铵 (TEAB) 盐的加入显着提高了所有 PI 溶液的电导率，显着改善了可纺性，并导致纤维更细。我们还使用分子动力学模拟来研究在铵盐存在下提高可纺性和纤维形态的大分子机制。小液滴与母液滴分离，随后离子通过水合效应快速蒸发，促进了静电纺丝。由于微孔性和疏水性三氟甲基侧基的存在，所得均匀纳米纤维在环境应用中具有巨大潜力，这增强了纤维对疏水性物质的吸附性能。这促进了静电纺丝。由于微孔性和疏水性三氟甲基侧基的存在，所得均匀纳米纤维在环境应用中具有巨大潜力，这增强了纤维对疏水性物质的吸附性能。这促进了静电纺丝。由于微孔性和疏水性三氟甲基侧基的存在，所得均匀纳米纤维在环境应用中具有巨大潜力，这增强了纤维对疏水性物质的吸附性能。

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Nanofiber engineering of microporous polyimides through electrospinning: Influence of electrospinning parameters and salt addition

Abstract The electrospinning of high-performance polyimides (PI) has recently sparked great interest. In this study, we explore the effect of the electrospinning parameters — namely polymer concentration, voltage, tip-to-collector distance and flow rate — and salt addition on the diameter, morphology, and spinnability of electrospun PI nanofibers. Three different polyimides of intrinsic microporosity (PIM-PIs) with high Brunauer–Emmett–Teller (BET) ranging from 270 to 506 m2 g−1, and two microporous polyimides, were synthesized through the polycondensation of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and aromatic diamines. The addition of tetraethylammonium bromide (TEAB) salt considerably increased the conductivity of all the PI solutions, significantly improved spinability, and resulted in thinner fibers. We also used molecular dynamic simulations to investigate the macromolecular mechanism of improved spinnability and fiber morphology in the presence of an ammonium salt. The small droplets detached from the parent droplet, followed by the rapid evaporation of the ions through the hydration effect, which facilitated the electrospinning. The resulting uniform nanofibers have great potential in environmental applications due to the presence of microporosity and hydrophobic pendant trifluoromethyl groups, which enhance the sorption performance of the fibers for hydrophobic species.

更新日期：2021-01-01

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