A Raman spectro-microscopic investigation of ETFE-based radiation-grafted anion-exchange membranes

Varcoe, John A Raman spectro-microscopic investigation of ETFE-based radiation-grafted anion-exchange membranes [Dataset]

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Item Type:	Dataset
Divisions :	Faculty of Engineering and Physical Sciences > Chemistry
Principal Investigator :	Principal Investigator Email varcoe, john j.varcoe@surrey.ac.uk
Description :	This study used Raman spectro-microscopy to investigate the synthesis and degradation of radiation-grafted anion-exchange membranes (RG-AEM) made using 50 μm thick poly(ethylene-co-tetrafluoroethylene) (ETFE) films, vinylbenzyl chloride (VBC) monomer, and 1-methylpyrrolidine (MPY) amination agent. The data obtained confirmed the operation of the grafting-front mechanism. VBC grafting times of 1 and 4 h led to low degrees of grafting homogeneity, while 72 h led to extreme levels of grafting that resulted in mechanically weak RG-AEMs due to the excessive H2O contents. A grafting time of 16 h was optimal yielding a RG-AEM with an ion-exchange capacity (IEC) of 2.06 ± 0.02 mmol g-1 (n = 3). An excess of grafting was detected at the surface of this RG-AEM (at least within the first few μm of the surface). This RG-AEM was then degraded in O2-purged aqueous KOH (1.0 mol dm-3) for 14 d at 80 °C. Degradation was detected throughout the RG-AEM cross-section, where the Raman data was quantitatively consistent with the loss of IEC. A slight excess of degradation was detected at the surface of the RG-AEM. Degradation involved the loss of whole benzyl-1-methypyrrolidinium grafted units as well as the direct attack on the pendent (cationic) pyrrolidinium groups by the hydroxide anions.
:	Name Email ORCID Varcoe, John J.Varcoe@surrey.ac.uk
Publication Year of Data :	2017
Creation Dates :	03/10/2017
Funder :	EPSRC
Identification Number :	10.15126/surreydata.00842458
Grant Title :	High Spec Raman Spectrometer Regional Facility
Access Statement :	All data is freely available with no restrictions.
Copyright License :	CC BY
Data Access Contact :	Data Access Contact Email UNSPECIFIED researchdata@surrey.ac.uk
External Data Location :	Internal location
Data Format :	Excel files and spectrometer native file formats
Contributors :	Contribution Name Email ORCID Bance-Soualhi, Rachida r.bance-soualhi@surrey.ac.uk
Discipline :	Materials Chemistry
Keywords :	Radiation-grafting; anion-exchange membranes; Raman microscopy; alkali degradation
Version :	1
Depositing User :	Simon Smith
Date Deposited :	04 Oct 2017 08:05
Last Modified :	19 Jun 2018 06:13
URI:	http://epubs.surrey.ac.uk/id/eprint/842458

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