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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/12610

Title: Proton conductivity enhancement in oriented, sulfonated polyimide thin films
Authors: Krishnan, Karthik
Iwatsuki, Hiroko
Hara, Mitsuo
Nagano, Shusaku
Nagao, Yuki
Keywords: Proton conduction
Confined thin film
Organized structure
Issue Date: 2014-03-27
Publisher: Royal Society of Chemistry
Magazine name: Journal of Materials Chemistry A
Volume: 2014
Number: 19
Start page: 6895
End page: 6903
DOI: 10.1039/C4TA00579A
Abstract: Studies of proton transport in confined thin polymer electrolytes are essential for providing additional information regarding the structure-property relationships of such materials. Using a combination of proton transport measurements and structural characterization, we explored the effect of proton conductivity in sulfonated polyimide (SPI) under both bulk and nanostructured thin film systems. SPI film confined to a thickness of approximately 530 nm shows significant proton conductivity enhancement to a value of 2.6 × 10^<-1> S/cm (95% RH at 298 K), which is almost one order of magnitude more proton conductive than the bulk system (3.0 × 10^<-2> S/cm at 90% RH and 298 K). In thin film, the preferred chain packing along the in-plane direction can have considerable influence on the charge transport characteristics, which leads to the enhanced proton conductivity. The infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (p-MAIRS) and in situ grazing-incidence small-angle X-ray scattering (GISAXS) were used to investigate the direction of polymer orientation and the changes in the internal polymeric structure under various humidity conditions, respectively. Under high-humidity conditions, the strong interaction between the side-chain sulfonic acid groups and water molecules causes an abrupt change in the internal structure in bulk SPI. Such structural rearrangement results in a liquid-crystal-like ordered polymer structure. The RH dependent FTIR-ATR studies reveal that, the accumulation of large fraction of water molecules with stronger hydrogen bonding at high humidity region causes the huge deviation in the internal morphology of the bulk samples.
Rights: Copyright (C) 2014 Royal Society of Chemistry. Karthik Krishnan, Hiroko Iwatsuki, Mitsuo Hara, Shusaku Nagano and Yuki Nagao, Journal of Materials Chemistry A, 2014(19), 2014, 6895-6903. http://dx.doi.org/10.1039/C4TA00579A - Reproduced by permission of The Royal Society of Chemistry
URI: http://hdl.handle.net/10119/12610
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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