Decarboxylation Cross-Linking of Triptycene-Based Tröger’s Base Polymers for Gas Separation,Industrial & Engineering Chemistry Research

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Decarboxylation Cross-Linking of Triptycene-Based Tröger’s Base Polymers for Gas Separation
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-09-21 , DOI: 10.1021/acs.iecr.0c03740
Tong Zhang ₁ , Liming Deng ₁ , Pei Li ₁

Affiliation

Previous studies demonstrate that decarboxylation cross-linking improves both the plasticization resistance and gas separation properties of a polymer precursor. However, when the decarboxylation reactions were carried out at low temperatures (350–400 °C), gas permeability was low because of the intrinsically low gas permeability of the polymer precursor. In this work, we synthesized a series of highly permeable polymer precursors having a triptycene-based Tröger’s base (TB) backbone structure and different amounts of carboxylic acid side groups. The TB polymer precursors were heated in a temperature range of 275–400 °C to induce cross-linking. After cross-linking, a more open polymer structure was obtained, resulting in an increase in the free volume fraction and gas permeability. The lowest cross-linking temperature was 350 °C and the separation performances of the cross-linked polymers surpassed the “2008 Robeson Upper Bound” for the CO₂/CH₄ and O₂/N₂ gas pairs. Moreover, the cross-linked polymers were not plasticized by CO₂ at a pressure up to 30 bar.

中文翻译：

三萜系Tröger基础聚合物的脱羧交联用于气体分离

先前的研究表明，脱羧交联可改善聚合物前体的抗塑化性和气体分离性能。但是，当脱羧反应在低温（350–400°C）下进行时，由于聚合物前体的固有气体渗透率较低，因此气体渗透率较低。在这项工作中，我们合成了一系列具有三萜烯基Tröger碱（TB）主链结构和不同量羧酸侧基的高渗透性聚合物前体。TB聚合物前体在275–400°C的温度范围内加热以诱导交联。交联之后，获得了更开放的聚合物结构，导致自由体积分数和气体渗透率的增加。₂ / CH ₄和O ₂ / N ₂气对。此外，交联聚合物在高达30 bar的压力下不会被CO ₂增塑。

更新日期：2020-10-15

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