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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rheological Changes and Kinetics of Water Uptake by Poly(ionic liquid)-Based Thin Films

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Author(s):
Benedetti, Tania M. [1] ; Torresi, Roberto M. [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Langmuir; v. 29, n. 50, p. 15589-15595, DEC 17 2013.
Web of Science Citations: 16
Abstract

Water uptake by thin films composed of the poly(ionic liquid) poly{[}diallyldimethylammonium bis(trifluoromethanesulfonyl)imide] (PDDATf(2)N) and the ionic liquid N,N-butylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr(1.4)Tf(2)N) was studied with a quartz crystal microbalance with dissipation. The data obtained for films with different compositions during the passage of dry and wet N-2 flow through the films were simulated with the Kevin-Voigt viscoelastic model for assessment of the mass of uptake water as well as the viscoelastic parameters. Our results show that the ionic liquid acts as a plasticizer, reducing the rigidity of the film and decreasing the capacity of water uptake. Introduction to a Li salt (LiTf2N) increases the water uptake capacity and also affects both elastic and viscous parameters due to aggregation among the ions from the ionic liquid and Li+. However, due to the preferable interaction of Li+ ions with water molecules, these aggregates are broken when the film is hydrated. In short, the presence of water in such films affects their mechanical properties, which can reflect in their performances as solid state electrolytes and ion-conducting membranes for electrochemical applications. (AU)

FAPESP's process: 09/53199-3 - Molecular recognition and energy storage: fundamental studies concerning geometry, size and synthesis effects on the optimization of the chemical properties of electroactive materials
Grantee:Roberto Manuel Torresi
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 12/02117-0 - Poly(ionic liquids) in electrochemical devices: polyelectrolytes for energy storage and conversion devices and stabilization of graphene and poly(3,4-etylenedioxidethiophene) (PEDOT) for electroactive films obtention
Grantee:Tania Machado Benedetti
Support Opportunities: Scholarships in Brazil - Post-Doctoral