NDLI: Proton conductivity enhancement in oriented, sulfonated polyimide thin films

Content Provider	Royal Society of Chemistry (RSC)
Author	Nagano, Shusaku Nagao, Yuki Krishnan, Karthik Iwatsuki, Hiroko Hara, Mitsuo
Copyright Year	2014
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. A 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−1 (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−1 at 90% RH and 298 K). In thin films, 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. 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 a structural rearrangement results in a liquid-crystal-like ordered polymer structure. The RH dependent FTIR-ATR studies reveal that the accumulation of a large fraction of water molecules with stronger hydrogen bonding at high humidity regions causes the huge deviation in the internal morphology of the bulk samples.
Starting Page	6895
Ending Page	6903
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	2
Issue Number	19
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta00579a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Proton Polymer Polyimide Proton (rocket family) Small-angle X-ray scattering Humidity Strong interaction Acid Hydrogen bond
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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