The paper of Prof. Masamichi Nishihara (Fuel Cells Research Division, I2CNER) and Prof. Aleksandar Staykov (Hydrogen Production Research Division, I2CNER) was published in online Polymer Physics on Nov 17, 2013, also will be published journal of Polymer Science Part B: Polymer Physics, Volume 52, Issue4, pages on Feb 15, 2014.
The nanostructure of sulfonated polyimide (SPI)/dihydroxynaphthalene (DHN) derivative charge-transfer (CT) complex hybrid films, which are noble alternative polymer electrolyte membranes (PEMs), is determined by a combined visible spectroscopy/quantum mechanical approach. From the visible spectra of SPI/2,6-dihydroxynaphthalene (2,6-DHN) and 1,5-dihydroxynaphthalene (1,5-DHN) CT complex hybrid films, it is confirmed that these films have different maximum wavelength, although difference of the molecular structure is small. From the calculation based on the experimental result, SPI and DHNs form multiple interactions consisting of not only CT interaction, but also hydrogen bonding in multilayered structures. CT interaction between SPI and DHN defines the DHN position in the SPI matrix, with DHN sitting in the cavity formed between SPIs. The molecular structure of the CT films derived from the multiple and complex interactions can recognize small differences in the structural isomers and bring changes of the optical property.
Authors: Masamichi Nishihara, Liana Christiani, Aleksandar Staykov and Kazunari Sasaki
Article first published online: 17 November, 2013