Publication | Open Access
Highly Permeable Benzotriptycene-Based Polymer of Intrinsic Microporosity
183
Citations
32
References
2015
Year
A novel polymer of intrinsic microporosity (PIM) was prepared from a diaminobenzotriptycene monomer using a polymerization reaction based on Tröger's base formation. The polymer (PIM-BTrip-TB) demonstrated an apparent Brunauer, Emmet, and Teller (BET) surface area of 870 m<sup>2</sup> g<sup>-1</sup>, good solubility in chloroform, excellent molecular mass, high inherent viscosity and provided robust thin films for gas permeability measurements. The polymer is highly permeable (e.g., <i>P</i>H<sub>2</sub> = 9980; <i>P</i>O<sub>2</sub> = 3290 Barrer) with moderate selectivity (e.g., <i>P</i>H<sub>2</sub>/<i>P</i>N<sub>2</sub> = 11.0; <i>P</i>O<sub>2</sub>/<i>P</i>N<sub>2</sub> = 3.6) so that its data lie over the 2008 Robeson upper bounds for the H<sub>2</sub>/N<sub>2</sub>, O<sub>2</sub>/N<sub>2</sub>, and H<sub>2</sub>/CH<sub>4</sub> gas pairs and on the upper bound for CO<sub>2</sub>/CH<sub>4</sub>. On aging, the polymer demonstrates a drop in permeability, which is typical for ultrapermeable polymers, but with a significant increase in gas selectivities (e.g., <i>P</i>O<sub>2</sub> = 1170 Barrer; <i>P</i>O<sub>2</sub>/<i>P</i>N<sub>2</sub> = 5.4).
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