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Unique Cellulose/Polydimethylsiloxane Blends as Advanced Hybrid Material for Organic Solvent Nanofiltration and Pervaporation Membranes

Abstract

A novel method for the preparation of cellulose-polydimethylsiloxane (PDMS) blend membranes for organic solvent nanofiltration (OSN) and ethanol pervaporation is presented. The elegance of this approach lies on the use of trimethylsilyl cellulose (TMSC), a hydrophobic cellulose derivative, for the blend membrane fabrication followed by a simple hydrolysis to convert the TMSC back into cellulose. The use of TMSC does not only allow cellulose processing in the common organic solvents, but also enables the creation of highly compatible cellulose-PDMS blend membranes. The proper composition of the blend membrane gave the best OSN performance with more than 10 L/m2hbar acetone permeance and around 750 Da molecular weight cut-off. The blend membrane can be used for OSN with any other solvents regardless their polarity. The same membrane also displayed an excellent pervaporation performance with a separation factor of 14 and a flux of 1.6 kg/m2h flux using a 5 wt% ethanol water mixture at room temperature. The blending of PDMS with cellulose resulted in a 100% increase of the separation factor when compared with pure PDMS. This surprising performance is a consequence of the good miscibility of the blending polymers, which can be obtained through this unique pathway. Overall, this study demonstrates a simple, efficient, scalable and the only possible way reported to date to combine the superiority of cellulose and PDMS as a low-cost and stable membrane for solvent separation.

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Publication details

The article was received on 23 Mar 2018, accepted on 05 Jun 2018 and first published on 05 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA02697A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Unique Cellulose/Polydimethylsiloxane Blends as Advanced Hybrid Material for Organic Solvent Nanofiltration and Pervaporation Membranes

    T. Puspasari, T. Chakrabarty, G. Genduso and K. Peinemann, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02697A

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