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首页> 外文期刊>RSC Advances >Porphyrinated polyimide honeycomb films with high thermal stability for HCl gas sensing
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Porphyrinated polyimide honeycomb films with high thermal stability for HCl gas sensing

机译：具有高热稳定性的卟啉化聚酰亚胺蜂窝膜，用于HCl气体传感

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摘要

We report thermally stable films with ordered pores from porphyrinated polyimides (PPIs) for HCl gas sensing. PPIs were synthesized by copolymerizing porphyrin units into the polyimide backbone. Thermal analyses reveal that the glass transition temperature and the thermal stability of PPIs are similar to that of the homopolyimide (HPI) without porphyrin units. The PPIs also show typical fluorescence emission behavior of the porphyrin units. Honeycomb films were prepared from PPIs and HPI via the breath figure method. The porous films show decreased pore diameters and change from monolayer to multilayer structures with the incorporation of porphyrin units. These are due to the interaction of porphyrin units with water molecules, as demonstrated by theoretical calculations based on density functional theory (DFT). The well-ordered porous PPI films have outstanding thermal stability. Furthermore, the films treated at different temperatures show remarkable fluorescence quenching behavior toward HCl gas with quenching ratios higher than 72%, whereas it is only about 50% for the corresponding dense film. Moreover, recovery experiments using ammonia gas demonstrate excellent reusability of the films. The PPI honeycomb films provide new opportunities in chemical sensing at high temperature.
机译：我们报道了从卟啉化的聚酰亚胺（PPI）产生有序孔的热稳定膜，用于HCl气体传感。通过将卟啉单元共聚到聚酰亚胺主链中来合成PPI。热分析表明，PPI的玻璃化转变温度和热稳定性与不含卟啉单元的均聚酰亚胺（HPI）相似。 PPI还显示了卟啉单元的典型荧光发射行为。通过呼吸图法从PPI和HPI制备蜂窝膜。多孔膜显示出减小的孔径，并且随着卟啉单元的加入而从单层结构变为多层结构。这些是由于卟啉单元与水分子的相互作用所致，正如基于密度泛函理论（DFT）的理论计算所证明的那样。排列整齐的多孔PPI膜具有出色的热稳定性。此外，在不同温度下处理的薄膜表现出显着的针对HCl气体的荧光猝灭行为，猝灭率高于72％，而对于相应的致密膜，其猝灭率仅为约50％。而且，使用氨气的回收实验证明了膜的极好的可重复使用性。 PPI蜂窝膜为高温化学传感提供了新的机会。

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