Journal article

Physical Aging Investigations of a Spirobisindane-Locked Polymer of Intrinsic Microporosity

Min Liu, Xinxin Lu, Mitchell D Nothling, Cara M Doherty, Lianhai Zu, Judy N Hart, Paul A Webley, Jianyong Jin, Qiang Fu, Greg G Qiao

ACS Materials Letters | AMER CHEMICAL SOC | Published : 2020

Abstract

Polymers of intrinsic microporosity (PIMs) have exceptional gas separation performance for a broad range of applications. However, PIMs are highly susceptible to physical aging, which drastically reduces their long-term performance over time. In this work, we leverage complementary experimental and density functional theory (DFT) studies to decipher the inter-/intrachain changes that occur during aging of the prototypical PIM-1 and its rigidified analogue PIM-C1. By elucidating this hereto unexplored aging behavior, we reveal that the dramatic decrease in gas permeability of PIM materials during aging stems from a loss of fractional free volume (FFV) due to PIM chain relaxations induced by π..

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Grants

Awarded by China Scholarship Council-University of Melbourne Research Scholarship


Awarded by Australian Research Council under the Future Fellowship


Funding Acknowledgements

The authors appreciate the Bio21 Advanced Microscopy Facility for the assistance with material characterization. M.L. acknowledges supports from the China Scholarship Council-University of Melbourne Research Scholarship (No. 201606260063) and the PhD Write Up Award from Melbourne School of Engineering. Q.F. acknowledges the Australian Research Council under the Future Fellowship (FT180100312). C.D. acknowledges support from the Veski Inspiring Women Fellowship. This research was also carried out with the assistance of computational resources provided by the Australian Government through the National Computational Infrastructure (NCI) under the National Computational Merit Allocation Scheme.