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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]

Full text not available from this repository.
Item Type: Dataset
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Principal Investigator :
Principal InvestigatorEmail
varcoe, johnj.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.
:
NameEmailORCID
Varcoe, JohnJ.Varcoe@surrey.ac.ukUNSPECIFIED
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 ContactEmail
UNSPECIFIEDresearchdata@surrey.ac.uk
External Data Location : Internal location
Data Format : Excel files and spectrometer native file formats
Contributors :
ContributionNameEmailORCID
UNSPECIFIEDBance-Soualhi, Rachidar.bance-soualhi@surrey.ac.ukUNSPECIFIED
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 : 04 Oct 2017 08:06
URI: http://epubs.surrey.ac.uk/id/eprint/842458

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