1. Temperature Dependence of Gas Permeation and Diffusion in Triptycene-Based Ultrapermeable Polymers of Intrinsic Microporosity
- Author
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Johannes C. Jansen, Marcello Monteleone, Mariolino Carta, Alessio Fuoco, Neil B. McKeown, Mariagiulia Longo, Ian Rose, Bibiana Comesaña-Gándara, C. Grazia Bezzu, and Elisa Esposito
- Subjects
Materials science ,Thermodynamics ,02 engineering and technology ,010402 general chemistry ,Thermal diffusivity ,01 natural sciences ,chemistry.chemical_compound ,entropic selectivity ,General Materials Science ,Gas separation ,ultrapermeability ,Solubility ,gas separation ,temperature dependence ,chemistry.chemical_classification ,Polymer ,Permeation ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,energetic selectivity ,polymer of Intrinsic microporosity ,chemistry ,Diffusion process ,Permeability (electromagnetism) ,Triptycene ,0210 nano-technology - Abstract
A detailed analysis of the basic transport parameters of two triptycene-based polymers of intrinsic microporosity (PIMs), the ultrapermeable PIM-TMN-Trip and the more selective PIM-BTrip, as a function of temperature from 25 to 55 degrees C, is reported. For both PIMs, high permeability is based on very high diffusion and solubility coefficients. The contribution of these two factors on the overall permeability is affected by the temperature and depends on the penetrant dimensions. Energetic parameters of permeability, diffusivity, and solubility are calculated using Arrhenius-van't Hoff equations and compared with those of the archetypal PIM-1 and the ultrapermeable, but poorly selective poly(trimethylsilylpropyne). This considers, for the first time, the role of entropic and energetic selectivities in the diffusion process through highly rigid PIMs. This analysis demonstrates that how energetic selectivity dominates the gas-transport properties of the highly rigid triptycene PIMs and enhances the strong size-sieving character of these ultrapermeable polymers.
- Published
- 2018
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