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Journal Articles

Electron-beam-induced chromism combined with photo- or thermal reverse reaction for color imaging

Enomoto, Kazuyuki; Maekawa, Yasunari; Kono, Sachiko*; Iwasaki, Masakazu*; Narita, Tadashi*

Journal of Photopolymer Science and Technology, 23(2), p.217 - 224, 2010/06

https://doi.org/10.2494/photopolymer.23.217

Times Cited Count：0 Percentile：0.01(Polymer Science)

Reversible color imaging on polymer films with spiropyran (SP-NO $_{2}$ ) or diarylethene (DE) has been examined by electron-beam (EB) induced chromism combined with a photo- or thermal reverse reaction. Colorless SP-NO $_{2}$ in a film transformed into red-colored merocyanine (MC-NO $_{2}$ ), which subsequently converted to the original SP-NO $_{2}$ via thermal treatment. In contrast, a photo reverse reaction could be applied for EB-induced color imaging using DE in the polymer films, where the thermally stable colored close-form can be converted to the original colorless open-form via photoreaction. The color images of 200 nm L/S patterns were produced in the PMMA film containing SP-NO $_{2}$ ; the images could be faded upon the thermal treatment. It is noted that these reactions are the first example for reversible transformation of color imaging induced by EB radiation together with heat or light treatment.

Oral presentation

Polymerization mechanism of radiation-induced grafting of styrene into alicyclic polyimides films for synthesis of polymer electrolyte membranes

Paku, S.; Enomoto, Kazuyuki; Yamashita, Takashi*; Maekawa, Yasunari

no journal, ,

Alicyclic polyimides (API) films, showing similar thermal and mechanical properties to those of aromatic PI films such as Kapton, were successfully converted to polymer electrolyte membranes (PEMs) for fuel cell using radiation-induced grafting polymerization with styrene and subsequent sulfonation. The API-PEM has higher ion conductivity and mechanical and thermal properties, compared with conventional PEM (Nafion). Using UV-VIS the long-lived intermediates in irradiated A-PI films were observed. In comparison with the decay profile of ESR spectra of irradiated A-PI films, the initiation species for the graft polymerization were identified to be the long-lived intermediate with max = 420 nm, and about 10% of the radicals could be acted as an initiator in grafting polymerization.