3 years ago

Effects of coating solvent and thermal treatment on transport and morphological characteristics of PDMS/Torlon composite hollow fiber membrane

Effects of coating solvent and thermal treatment on transport and morphological characteristics of PDMS/Torlon composite hollow fiber membrane
Dharmik S. Mikkilineni, Ali A. Rownaghi, Steven K. Burgess, Dhaval Bhandari
A new approach for formation of the polydimethylsiloxane (PDMS) layer on Torlon polyamide-imide hollow fiber (PAI-HF) support has been developed by directly after fiber spinning without the need to undergo the final conventional solvent exchange and drying step, thereby saving postspinning processing steps. The produced PDMS/PAI-HF composite membranes were found to have high CO2 permeance (i.e., 1100 GPU) and exhibited good CO2/N2 selectivities of 8–10 which is close to 90% of that of a PDMS dense film. The effects of coating solution, rewetting and crosslinking temperature on the PAI-HF morphological features, that is, gas transport, skin thickness, skin integrity, and substructure resistance are investigated. The rewetting and thermal treatment of the PAI-HF caused the densification of the skin layer and reduced the pore sizes on the top layer. In addition, the potential use of the PAI-HF support with polymers that are insoluble in hexane is also considered. Effects of water, methanol, and hexane exposure of PAI-HF to these solvents are considered. This evaluation calls attention to issues that must be addressed in any eventual use of the PAI-HF with water-soluble or methanol-soluble selective layer polymers, rather than simple hexane-soluble polymers such as PDMS. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45418.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.45418

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