Membranes with artificial free-volume for biofuel production
Nikos Petzetakis, Cara M. Doherty, Aaron W. Thornton, X. Chelsea Chen, Pepa Cotanda, Anita J. Hill, Nitash P. Balsara
TL;DR
This paper introduces a new method to create polymer membranes with adjustable free-volume for better alcohol separation in biofuel production.
Contribution
A novel method to generate artificial free-volume in polymer membranes using self-assembled triblock copolymers is presented.
Findings
Artificial free-volume improves alcohol permeability in polymer membranes.
The method allows fabrication of membranes with identical composition but varying free-volume.
The membranes show enhanced selectivity for alcohol-water separations relevant to biofuels.
Abstract
Free-volume of polymers governs transport of penetrants through polymeric films. Control over free-volume is thus important for the development of better membranes for a wide variety of applications such as gas separations, pharmaceutical purifications and energy storage. To date, methodologies used to create materials with different amounts of free-volume are based primarily on chemical synthesis of new polymers. Here we report a simple methodology for generating free-volume based on the self-assembly of polyethylene-b-polydimethylsiloxane-b-polyethylene triblock copolymers. We have used this method to fabricate a series of membranes with identical compositions but with different amounts of free-volume. We use the term artificial free-volume to refer to the additional free-volume created by self-assembly. The effect of artificial free-volume on selective transport through the membranes…
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Taxonomy
TopicsAdvanced Chemical Sensor Technologies