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Synthesis and characteristics of HAB-6FDA thermally rearranged polyimide nanocomposite membranes
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-08-19 , DOI: 10.1002/pen.25788
Harsh D. Patel 1 , Naveen K. Acharya 1
Affiliation  

The thermal rearrangement of polyimides of ortho-positioned functional group membranes improves the gas permselectivity properties of the polyimide precursor. For this experiment, HAB-6FDA polyimide was synthesized from 3,3 dihydroxy-4,4-diamino-biphenyl (HAB) and 2,2-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) by chemical imidization. A sample was modified from a pure polymer to silica nanoparticle composition. Furthermore, a modification was carried out by thermal rearrangement reaction at temperatures of 350, 400, and 450°C. The thermal property of these membrane films was characterized by differential scanning calorimetry (DSC), FTIR, opacity experiment, and free volume analysis. Permeability decreases with an increase in the kinetic diameter of gasses, which is normal behavior for glassy polymers. The composition of silica nanoparticles slightly changes the permeability in the polyimide. The combined effect of silica nanoparticles and thermal rearrangement of the HAB-6FDA membrane has shown an excellent performance. The thermal rearrangement with nanocomposite shows a significant impact on a larger effect on permeation for lighter gases, that is, H2, CO2, and O2, compared with N2 and CH4. Particularly for H2/CH4 gas pair, it lies over Robeson's 2008 upper bound limit, which fits the composition in the novel class for the gas separation membranes.

中文翻译:

HAB-6FDA热重排聚酰亚胺纳米复合膜的合成及特性

邻位官能团膜的聚酰亚胺的热重排提高了聚酰亚胺前体的气体选择性渗透性能。在本实验中,HAB-6FDA 聚酰亚胺是由 3,3-二羟基-4,4-二氨基-联苯 (HAB) 和 2,2-双-(3,4-二羧基苯基) 六氟丙烷二酐 (6FDA) 通过化学酰亚胺化合成的。将样品从纯聚合物改性为二氧化硅纳米颗粒组合物。此外,在350、400和450℃的温度下通过热重排反应进行改性。这些膜的热性能通过差示扫描量热法 (DSC)、FTIR、不透明度实验和自由体积分析进行表征。渗透性随着气体动力学直径的增加而降低,这是玻璃态聚合物的正常行为。二氧化硅纳米粒子的组成略微改变了聚酰亚胺的渗透性。二氧化硅纳米粒子和HAB-6FDA膜的热重排的综合作用显示出优异的性能。纳米复合材料的热重排显示出对较轻气体渗透的更大影响的显着影响,即 H2、CO 2和O 2,与N 2和CH 4相比。特别是对于 H 2 /CH 4气体对,它超过了 Robeson 2008 年的上限,这符合气体分离膜新型类别的组成。
更新日期:2021-08-19
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