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Synthesis and gas separation properties of OH-functionalized Tröger's base-based PIMs derived from 1,1′-binaphthalene-2,2′-OH
Polymer ( IF 4.1 ) Pub Date : 2020-03-13 , DOI: 10.1016/j.polymer.2020.122369
Shao-Lu Li , Zhiyang Zhu , Jianxin Li , Yunxia Hu , Xiaohua Ma

Two novel OH-functionalized intrinsically microporous polymers were successfully synthesized from a tert-butyldimethylsilyl (TBS) protected 1,1′-binaphthalene-diamine monomer (NH2-BINOL-TBS). Interestingly, the polymerization and the removal of the TBS to form OH group happened at the same time. Polymers with 30% (PIM-HNTB-30) and 60% (PIM-HNTB-60) OH concentration were obtained by controlling the reaction time of 3.5 and 12 h, and confirmed by nuclear magnetic resonance spectroscopy (NMR). PIM-HNTB-30 exhibited higher Brunauer-Emmett-Teller (BET) surface area (432 vs 153 m2 g-1) and thermal stabilities (420 vs 385 °C) than PIM-HNTB-60. Both membranes showed modest gas permeabilities and selectivities, and PIM-HNTB-60 exhibited a relatively higher performance. After long-term aging or thermally annealed above glass transition temperature (Tg), both polymers exhibited a decreased permeabilities combined with a selectivity increase, and the 350 °C treated PIM-HNTB-60 exhibited O2 permeability of 89 Barrer and O2/N2 selectivity of 4.47. In all, the OH functionalization provided a good way to enhance the gas separation performance.



中文翻译:

1,1'-双萘-2,2'-OH衍生的OH-官能化Tröger碱基PIM的合成和气体分离性能

从叔丁基二甲基甲硅烷基(TBS)保护的1,1'-联萘-二胺单体(NH 2 -BINOL-TBS)成功合成了两种新型的OH-官能化的本质上微孔聚合物。有趣的是,聚合和除去TBS形成OH基是同时发生的。通过控制3.5和12小时的反应时间,获得具有30%(PIM-HNTB-30)和60%(PIM-HNTB-60)OH浓度的聚合物,并通过核磁共振波谱法(NMR)确认。PIM-HNTB-30表现出更高的Brunauer-Emmett-Teller(BET)表面积(432 vs 153 m 2  g -1)和热稳定性(420 vs385°C)。两种膜均显示出适度的气体渗透性和选择性,而PIM-HNTB-60表现出相对较高的性能。经过长期老化或在高于玻璃化转变温度(T g)的温度下进行热退火后,两种聚合物的渗透率均降低,而选择性则有所提高,经350°C处理的PIM-HNTB-60的O 2渗透率为89 Barrer和O 2 / N 2的选择性为4.47。总之,OH官能化提供了一种增强气体分离性能的好方法。

更新日期:2020-03-16
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