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Open AccessArticle

Effect of Physical Aging on Gas Transport in Asymmetric Polyimide Hollow Fibers Prepared by Triple-Orifice Spinneret

Institute on Membrane Technology (ITM-CNR), c/o University of Calabria, via P. Bucci 17/C, 87036 Rende (CS), Italy
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Polymers 2020, 12(2), 441; https://doi.org/10.3390/polym12020441 (registering DOI)
Received: 3 December 2019 / Revised: 7 January 2020 / Accepted: 10 February 2020 / Published: 13 February 2020
(This article belongs to the Special Issue Durability of Polymer Micro- and Nano-Composites)
The systematic evaluation of the gas transport properties related to differences in the history of the samples is a useful tool to appropriately design a membrane-based gas separation system. The permeation rate of six pure gases was measured over time in asymmetric hollow-fiber (HF) samples, that were prepared according to the non-solvent-induced phase separation in different operation conditions, in order to identify their response to physical aging. Four types of HFs having a different structure were analyzed, comparing samples spun in a triple-orifice spinneret to HFs prepared using a conventional spinneret. A generalized gas permeance decline, coupled to a maintained permselectivity for the different gas pairs, was observed for all HFs. Instead, H2/N2 permselectivity values were enhanced upon aging. Cross-linked hollow-fiber samples showed a marked size-sieving behavior that favored the separation of small species, e.g., hydrogen, from other larger species and a good stability over time. Some HFs, post-treated using different alcohols, presented a permeance decay independently on the alcohol type and a greater selectivity over time. View Full-Text
Keywords: Hollow-fiber membranes; physical aging; triple-orifice spinneret; crosslinking; gas separation Hollow-fiber membranes; physical aging; triple-orifice spinneret; crosslinking; gas separation
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Clarizia, G.; Tasselli, F.; Bernardo, P. Effect of Physical Aging on Gas Transport in Asymmetric Polyimide Hollow Fibers Prepared by Triple-Orifice Spinneret. Polymers 2020, 12, 441.

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