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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/16672

Title: Lyotropic ordering for high proton conductivity in sulfonated semialiphatic polyimide thin films
Authors: Takakura, Kensaku
Ono, Yutaro
Suetsugu, Kota
Hara, Mitsuo
Nagano, Shusaku
Abe, Takashi
Nagao, Yuki
Keywords: Sulfonated polyimide
Thin film
Molecular orientation
Organized structure
Proton conductivity
Lyotropic liquid crystalline property
Issue Date: 2018-08-03
Publisher: Springer Nature
Magazine name: Polymer Journal
Volume: 51
Start page: 31
End page: 39
DOI: 10.1038/s41428-018-0111-1
Abstract: Influence of the semi-aliphatic backbone on the molecular ordering and proton conductivity was investigated compared to the rigid aromatic backbone in highly proton-conductive organized polyimide thin films. We newly synthesized two alkyl sulfonated semi-aliphatic polyimides (ASSPIs) with different molecular weights and investigated their molecular organized structure, proton conductivity, water uptake, and dissociation state of protons from sulfonic acid groups in thin films by in-situ measurements for grazing incidence small-angle X-ray scattering (GISAXS), quartz crystal microbalance (QCM), Fourier transform infrared (FT-IR) spectra, and impedance spectra. Declining of planarity in the semi-aliphatic backbone reduced the aggregative character and molecular ordering in the lyotropic liquid crystalline (LC) structure. However, the higher molecular weight ASSPI exhibited the oriented lamellar structure in spite of lower planarity of the main chain. The proton conductivity of the oriented lamellar thin film displayed a more than half order of magnitude higher value of 1.5 × 10^<-1> S cm^<-1> than that of the non-oriented lamellar thin film (3.0 × 10^<-2> S cm^<-1>) at 25°C and 95% RH. These results indicate that, in sulfonated polyimide thin films, the lamellar orientation greatly contributes to the high proton conductivity in the ASSPI thin films.
Rights: This is the author-created version of Springer, Kensaku Takakura, Yutaro Ono, Kota Suetsugu, Mitsuo Hara, Shusaku Nagano, Takashi Abe, and Yuki Nagao, Polymer Journal, 51, 2018, 31-39. The original publication is available at www.springerlink.com, https://doi.org/10.1038/s41428-018-0111-1
URI: http://hdl.handle.net/10119/16672
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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