Correlating Gas Permeability and Young’s Modulus during the Physical Aging of Polymers of Intrinsic Microporosity Using Atomic Force Microscopy

Mariagiulia Longo, Maria Penelope De Santo, Elisa Esposito, Alessio Fuoco, Marcello Monteleone, Lidietta Giorno, Bibiana Comesaña-gándara, Jie Chen, C. Grazia Bezzu, Mariolino Carta, Ian Rose, Neil B. Mckeown, Johannes C. Jansen

Research output: Contribution to journalArticlepeer-review

Abstract

The relationship, during physical aging, between the transport properties and Young’s modulus for films of polymers of intrinsic microporosity (PIM) was investigated using pure gas permeability and atomic force microscopy (AFM) in force spectroscopy mode. Excellent agreement of Young’s modulus measured for the archetypal PIM-1 with values obtained by other techniques in the literature, confirms the suitability of AFM force spectroscopy for the rapid and convenient assessment of mechanical properties. Results from different polymers including PIM1 and five ultrapermeable benzotriptycene-based PIMs provide direct evidence that size selectivity is strongly correlated to Young’s modulus. In addition, film samples of one representative PIM (PIM-DTFM-BTrip) were subjected to both normal physical aging and to accelerated aging by thermal conditioning under vacuum for comparison. Accelerated aging resulted in a similar decrease in permeability and increase in Young’s modulus as normal aging, however, significant differences suggest that thermally induced accelerated ageing occurs throughout the bulk of the polymer film whereas normal aging occurs predominantly at the surface of the film. For all PIMs, the increased in film rigidity upon aging led to an increase in gas size selectivity.
Original languageEnglish
JournalIndustrial & Engineering Chemistry Research
Early online date20 Nov 2019
DOIs
Publication statusE-pub ahead of print - 20 Nov 2019

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