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Polyimide aerogels with novel bimodal micro and nano porous structure assembly for airborne nano filtering applications

机译：具有新型双峰微纳米多孔结构组件的聚酰亚胺气凝胶，用于空降纳米过滤应用

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摘要

Aerogels have presented a very high potential to be utilized as airborne nanoparticles' filtration media due to their nanoscale pore size and extremely high porosity. The filtering performance of aerogels, such as air permeability and filtration efficiency, is highly related to the configuration of aerogels' nanostructure assembly. However, as aerogel morphology is formed with respect to the intermolecular forces during the gelation stage, tailoring the aerogel nanostructure assembly is still a challenge. In this work, a novel strategy for tailoring polyimide aerogel nanostructure assembly is proposed by controlled disturbing of the intermolecular forces. From the results, the nanostructure assembly of the 4,4 '-oxydianiline (ODA)-biphenyl-tetracarboxylic acid dianhydride (BPDA) polyimide aerogel is tailored to a uniform bimodal micro and nano porous structure. This was achieved by introducing the proper fraction of thermoplastic polyurethane (TPU) chains to the polyimide chains in the solution state and through a controlled process. The fabricated polyimide/TPU aerogels with bimodal morphology presented enhanced filtration performance, with 30% improved air permeability and reduced cell size of 3.51 nm over the conventional ODA-BPDA polyimide aerogels. Moreover, the fabricated bimodal aerogels present the reduced shrinkage, density, and effective thermal conductivity of 6.3% and 0.063 g cm(-3), 28.7 mW m(-1)K(-1), respectively. Furthermore, the bimodal polyimide/TPU aerogels show the higher porosity of 96.5 vol% along with increased mechanical flexibility over the conventional polyimide aerogel with comparable backbone chemistry.
机译：由于其纳米级孔径和极高的孔隙率，Aerogels呈现出非常高的潜力作为空气纳米颗粒过滤介质。与透气性和过滤效率的气凝胶的过滤性能与Aerogels纳米结构组件的配置高度相关。然而，随着在凝胶化阶段期间相对于分子间力形成气凝胶形态，剪裁气凝胶纳米结构组件仍然是一个挑战。在这项工作中，通过控制扰动分子间力来提出一种用于纵向聚酰亚胺气凝胶纳米结构组件的新策略。从结果中，4,4'-氧基苯胺（ODA）-Biphyl-四羧酸二酐（BPDA）聚酰亚胺气凝胶的纳米结构组件被定制为均匀的双峰微和纳米多孔结构。这是通过将热塑性聚氨酯（TPU）链的适当部分与溶液状态和通过受控方法引入聚酰亚胺链来实现的。具有双峰形态的制造的聚酰亚胺/ TPU气凝胶提高了过滤性能，透气渗透率提高了30％，降低了常规ODA-BPDA聚酰亚胺气凝胶的3.51nm的细胞尺寸。此外，制造的双峰气凝胶分别具有6.3％和0.063g cm（-3），28.7mW m（-1）k（-1）的降低的收缩，密度和有效的导热率。此外，双峰聚酰亚胺/ TPU Aerogels显示出96.5体积％的孔隙率高，随着具有相当骨架化学的常规聚酰亚胺气凝胶上的机械柔韧性增加。

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