Claisen-type degradation mechanism of cellulose triacetate membranes in ethanol-water mixtures

Wang, David K., Zhang, Xiwang and Diniz da Costa João C. (2014) Claisen-type degradation mechanism of cellulose triacetate membranes in ethanol-water mixtures. Journal of Membrane Science, 454 119-125. doi:10.1016/j.memsci.2013.12.010


Author Wang, David K.
Zhang, Xiwang
Diniz da Costa João C.
Title Claisen-type degradation mechanism of cellulose triacetate membranes in ethanol-water mixtures
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
1873-3123
Publication date 2014-03-15
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.memsci.2013.12.010
Open Access Status Not Open Access
Volume 454
Start page 119
End page 125
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 1606 Political Science
2500 Materials Science
1303 Specialist Studies in Education
1506 Tourism
Formatted abstract
Highlights
• Long term ethanol exposure study of cellulose triacetate (CTA) matrices over 4 weeks.
• Elucidated degradation mechanism of CTA membranes via XPS and ATR-FTIR.
• Membrane degradation proceeded via a classical Claisen-type and water condensations.
• Formation of the acetoacetate and ether pendant groups on the CTA backbone.
• Consequence of membrane degradation leads to loss of membrane stability and performance.

This work reports for the first time the degradation mechanism of cellulose triacetate membranes exposed to ethanol–water mixtures. The process of membrane degradation is elucidated by XPS, ATR-FTIR, NMR to proceed via a classical Claisen-type condensation followed by water condensation reactions leading to the formation of the acetoacetate and ether pendant groups in the polymeric matrix. This work provides vital insight into the chemical stability and durability of the cellulose ester-based membranes for long term operation in liquid separation applications involving ethanol solutions.
Keyword Cellulose triacetate
Membranes
Degradation mechanism
Ethanol separation
Claisen-type condensation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 16 December 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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