Electrospun polyimide nanofiber-coated polyimide nonwoven fabric for hot gas filtration

In the present work, heat-endurable polyimide nanofibrous membrane-coated commercial polyimide nonwoven fabrics were prepared by electrospinning synthesized polyamic acid solution on polyimide mats followed by a thermal imidization process. Polyimide synthesized was confirmed by Fourier-transform infrared spectroscopy and thermogravimetric analysis tests. A higher viscosity of precursor solution resulted in a nanofibrous network coated on the nonwoven fabrics. The coated filter showed lower dimension of pores and greater portion of small pores. The proportion of pores less than 10 mu m reached as high as 71.2%. PM2.5 removal efficiency was increased from 81.4 to 97.2%. However, the pressure drop of air flow over the filters did not show significant changes. It suggested a facile method to improve the filtration performance of commercial polyimide nonwoven fabric filters.

在目前的工作中，通过将合成的聚酰胺酸溶液电纺到聚酰亚胺垫上，然后进行热酰亚胺化工艺，制备了耐热性聚酰亚胺纳米纤维膜涂覆的商品化聚酰亚胺无纺布。 合成的聚酰亚胺通过傅里叶变换红外光谱法和热重分析测试得到证实。 前体溶液的较高粘度导致在非织造织物上涂覆纳米纤维网络。 涂覆的过滤器显示出较小的孔尺寸和较大的小孔部分。 小于10μm的孔的比例高达71.2％。 PM2.5去除效率从81.4％提高到97.2％。 然而，通过过滤器的气流的压降没有显示出明显的变化。 提出了一种简便的方法来改善商用聚酰亚胺非织造布过滤器的过滤性能。

Published: 2018

Journal ：ADSORPTION SCIENCE & TECHNOLOGY

Impact Factor：2.767

Paper link: https://journals.sagepub.com/doi/full/10.1177/0263617418807111