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Ishikawa, Hirotaku*; Kai, Tetsuya; Sato, Hirotaka*; Kamiyama, Takashi*
Journal of Nuclear Science and Technology, 56(2), p.221 - 227, 2019/02
Times Cited Count：3 Percentile：31.89(Nuclear Science & Technology)
-ray irradiated polyethylene with KOH treatment and SEM-EDSShimada, Akihiko; Sugimoto, Masaki; Yoshikawa, Masahito
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 30, 2015/03
In case of the accelerated ageing test on polymer cable insulation used for the nuclear power facility, it is very important to recognize whether oxygen penetrates in the polymer wholly or not. To confirm this, there are the method by which polymer is soaked in the KOH solution at 70
C for 5 minutes, dried and observed by a SEM-EDS, only for ethylene propylene rubber, one of the polymers. This study is to apply that method for polyethylene. Polyethylene sheet of 2 mm thickness was irradiated by ray at a dose rate of 2 kGy/h for 400 h. A piece of irradiated polyethylene was picked up and the piece was soaked in the KOH solution for 24 h. After that, the piece was observed by a SEM-EDS. At the region within 70 micro meters from the surface, potassium is observed. It means that oxidation is occurred in this region. From now on, optimum soaking time will be examined.
Hakoda, Teruyuki; Kojima, Takuji
Radiation Physics and Chemistry, 74(5), p.302 - 309, 2005/12
Times Cited Count：0 Percentile：0.01(Chemistry, Physical)no abstracts in English
-poly(alkyl vinyl ether) membranes for polymer electrolyte membrane fuel cells by radiation processingChen, J.; Asano, Masaharu; Yamaki, Tetsuya; Yoshida, Masaru
Journal of Membrane Science, 256(1-2), p.38 - 45, 2005/06
New polymer electrolyte membranes having sulfonic acid groups for polymer electrolyte membrane fuel cell applications were prepared by simultaneous radiation-induced grafting method. The poly(tetrafluoroethylene) (PTFE) films, crosslinked by electron-beam radiation at molten temperature, were used as substrates for grafting of two alkyl vinyl ether monomers, propyl vinyl ether (nPVE) and isopropyl vinyl ether (iPVE), under controlled grafting conditions followed by sulfonation reactions. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), water contact angle and Fourier transform infrared (FTIR) were used to characterize the crosslinked PTFE (cPTFE) and grafted cPTFE films. The degree of grafting was found to be dependent on the grafting parameters such as irradiation temperature and Lewis acid catalyst, in which in the presence of Lewis acid catalyst or at a temperature close to the boiling point of each monomer, the grafting reaction significantly accelerated even when the relatively low dose was irradiated. Finally, the grafted cPTFE films were sulfonated in a chlorosulfonic acid solution. In spite of the lower ion-exchange capacity (0.75 mmol/g), the membrane synthesized in this study showed a proton conductivity as high as the Nafion 112.
Yamaki, Tetsuya; Kobayashi, Kazuhiro; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
Polymer, 45(19), p.6569 - 6573, 2004/09
Times Cited Count：56 Percentile：82.78(Polymer Science)We prepared proton exchange membranes by the -ray-induced post grafting of styrene into crosslinked polytetrafluoroethylene (PTFE) films and subsequent sulfonation. The degree of grafting was controlled in the range of 7-75% by the crosslinking density of the PTFE matrix as well as the grafting conditions. Under our preparation conditions, the films at the grafting yield of 
30% were found to produce ion exchange membranes with a homogeneous distribution of sulfonic acid groups. The resulting membranes showed a large ion exchange capacity up to 2.9 meq g
, which exceeded the performance of commercially-available perfluorosulfonic acid films such as Nafion; nevertheless, they appeared to be dimensionally stable in water. These should undoubtedly result from the use of the crosslinked PTFE films as graft substrates and make our ion exchange membranes promising for applications to polymer electrolyte fuel cells.
Zhu, Z.; Maekawa, Yasunari; Koshikawa, Hiroshi; Suzuki, Yasuyuki; Yonezawa, Noriyuki*; Yoshida, Masaru
Nuclear Instruments and Methods in Physics Research B, 217(3), p.449 - 456, 2004/05
Times Cited Count：20 Percentile：76.55(Instruments & Instrumentation)The pretreatment effects using UV light illumination and DMF soaking on bulk and track etching rates of PET films were investigated. The wavelength of illuminated UV light plays an important role in sensitizing track etching. Illumination with the light at wavelengths longer than 320nm showed strong enhancement in the track etching rates without influence on the bulk etching rates, whereas light with the wavelengths lower than 320nm causes large enhancement in both track and bulk etching rates even in the interior of the material. The track etching rate is found to be not constant along ion tracks, which is attributed to the inhomogeneous distribution of reactive chemical species induced during post-UV light illumination. Furthermore, the DMF soaking of PET after UV light illumination can enhance the etching sensitivity of the track by more than 100 times. The phenomenon is attributed to the high diffusion of organic solution along tracks after UV light illumination.
Maekawa, Yasunari; Koshikawa, Hiroshi; Yoshida, Masaru
Polymer, 45(7), p.2291 - 2295, 2004/03
Times Cited Count：8 Percentile：28.48(Polymer Science)Ion track membranes of poly(ethylene terephthalate) (PET) are applied to the production of anisotropically conducting films possessing copper wires of less than sub-micron in diameter. The membranes possessing cylindrical pores of 1.9 
m and 200 nm in diameter were prepared by irradiation of 
Xe
ion beams followed by etching in an aqueous NaOH. Copper wires were deposited into the pores by electrochemical plating in aqueous copper sulfate solution to prepare the PET/Cu hybrid membranes. The copper wires with 1.9 m in diameter showed wavelike surface roughness, resulting from the roughness of the pore side wall, whereas the copper wires with 200 nm in diameter showed smooth surfaces. The resistances of the membranes measured by a four terminal resistance method are in good agreement with the calculated values, indicating that the hybrid membranes possess conductivity perpendicular to the membrane surfaces but not parallel to the surfaces.
Maekawa, Yasunari; Suzuki, Yasuyuki; Maeyama, Katsuya*; Yonezawa, Noriyuki*; Yoshida, Masaru
Chemistry Letters, 33(2), p.150 - 151, 2004/02
Times Cited Count：4 Percentile：21.74(Chemistry, Multidisciplinary)Since well-characterized chemical modification of pore inner surfaces in polymer membranes should be very important from the view point of synthetic chemistry of polymer surfaces as well as designing materials for application such as separation membranes and nanoscopic electronic devices, we reported herein the chemical modification of internal surfaces of the cylindrical pores with 0.31 and 0.54 m in diameter through the reaction of the carboxylic acids on the surfaces with the alkylation reagent bearing a pyrene fluorophore. The incorporation of the fluorophore on the pore internal surfaces were successfully confirmed by the fluorescence microscope images of the membrane reacting with the alkylation reagent bearing a pyrene fluorophore.
Haruyama, Yasuyuki; Sunaga, Hiromi; Arakawa, Kazuo; Seguchi, Tadao
JAERI-Tech 2002-084, 105 Pages, 2002/11
JAERI-Tech-2002-084.pdf:2.01MB
no abstracts in English
Yamazaki, Takanori*; Seguchi, Tadao
Journal of Polymer Science, Part A; Polymer Chemistry, 38(17), p.3092 - 3099, 2000/09
no abstracts in English
-irradiated acetyloxy end-capped poly(oxymethylene)Hasegawa, Shin; Takeshita, Hidefumi; Yoshii, Fumio; Sasaki, Akira; Makuuchi, Keizo; Nishimoto, S.*
Polymer, 41(1), p.111 - 120, 2000/01
Times Cited Count：54 Percentile：83.35(Polymer Science)no abstracts in English
Li(p,n) reactionNakao, Noriaki*; Nakashima, Hiroshi; Nakao, Makoto*; Sakamoto, Yukio; Nakane, Yoshihiro; ; Tanaka, Shunichi; Nakamura, Takashi*
JAERI-Data/Code 98-013, 46 Pages, 1998/03
JAERI-Data-Code-98-013.pdf:2.14MB
no abstracts in English
Sato, K.*; *; Takayanagi, Toshiyuki; *; Yokoyama, Atsushi
Journal of Chemical Physics, 106(24), p.10123 - 10133, 1997/06
Times Cited Count：31 Percentile：71.53(Chemistry, Physical)no abstracts in English
Teraoka, Yuden; Sasaki, Teikichi
Photon Factory Activity Report, (13), P. 347, 1996/00
no abstracts in English
Ito, Yasuo*; F.M.H.Mohamed*; Seguchi, Tadao; *
Radiation Physics and Chemistry, 48(6), p.775 - 779, 1996/00
Times Cited Count：19 Percentile：80.29(Chemistry, Physical)no abstracts in English
Tabata, Yoneho*; *; *; Seguchi, Tadao
Radiation Physics and Chemistry, 48(5), p.563 - 568, 1996/00
no abstracts in English
Arai, Hidehiko
Genshiryoku Kogyo, 41(7), p.36 - 40, 1995/00
no abstracts in English
*; *; ; Hatada, Motoyoshi
Journal of Applied Polymer Science, 55, p.1643 - 1649, 1995/00
Times Cited Count：0 Percentile：0.01(Polymer Science)no abstracts in English
*; Tabata, Yoneho*; Kudo, Hisaaki; Seguchi, Tadao
Radiation Physics and Chemistry, 45(2), p.269 - 273, 1995/00
Times Cited Count：186 Percentile：99.73(Chemistry, Physical)no abstracts in English
Tokunaga, Okihiro; Arai, Hidehiko
Radioisotopes, 43(12), p.781 - 790, 1994/12
no abstracts in English
