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Angew Chem Int Ed Engl. 2016 Feb 5;55(6):1998-2001. doi: 10.1002/anie.201508070. Epub 2016 Jan 8.

Hypercrosslinked Additives for Ageless Gas-Separation Membranes.

Author information

1
CSIRO, Bag 10, Clayton South, 3169, VIC, Australia. Cherhon.Lau@csiro.au.
2
CSIRO, Bag 10, Clayton South, 3169, VIC, Australia.
3
School of Chemistry, Bio21 Institute, The University of Melbourne, VIC, 3010, Australia.
4
CSIRO, Bag 10, Clayton South, 3169, VIC, Australia. Matthew.Hill@csiro.au.
5
CSIRO, Bag 10, Clayton South, 3169, VIC, Australia. Colin.Wood@csiro.au.

Abstract

The loss of internal pores, a process known as physical aging, inhibits the long-term use of the most promising gas-separation polymers. Previously we reported that a porous aromatic framework (PAF-1) could form a remarkable nanocomposite with gas-separation polymers to stop aging. However, PAF-1 synthesis is very onerous both from a reagent and reaction-condition perspective, making it difficult to scale-up. We now reveal a highly dispersible and scalable additive based on α,α'-dichloro-p-xylene (p-DCX), that inhibits aging more effectively, and crucially almost doubles gas-transport selectivity. These synergistic effects are related to the intimately mixed nanocomposite that is formed though the high dispersibility of p-DCX in the gas-separation polymer. This reduces particle-size effects and the internal free volume is almost unchanged over time. This study shows this inexpensive and scalable polymer additive delivers exceptional gas-transport performance and selectivity.

KEYWORDS:

Davankov polymers; gas separation; hypercrosslinked polymers; membranes; physical aging

PMID:
26749173
DOI:
10.1002/anie.201508070

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