Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Koizumi, Satoshi; Tominaga, Tetsuo*; Sone, Takuo*; Yuasa, Takeshi*
no journal, ,
For investigating the dispersion state of silica particles in styrene-butadiene rubber composites, we measured its small angle neutron scattering with polarizing its proton spins. By proton spin polarization, we can control the coherent scattering length for neutron beam. As a result, we succeeded in abstracting the scattering profile only from the silica particles.
Zhao, Y.; Koizumi, Satoshi; Rikukawa, Masahiro*; Yoshida, Miru*
no journal, ,
Yamaguchi, Daisuke; Koizumi, Satoshi; Ojima, Hitoshi*; Isoyama, Ryo*; Ishiwatari, Yoshiyuki*; Kodama, Hiroto*; Takeda, Hisanori*; Fukita, Hitoshi*; Takashima, Yoshiyuki*
no journal, ,
Resin-filler composites were investigated by small-angle neutron scattering (SANS). Two types of fillers, talc and TiO
, were employed and compounded with polypropylene in this study. The dispersion state of the fillers was examined by SANS measurements. In addition, the size distribution of the fillers was separately measured through the laser right scattering and SEM. The calculated scattering function including the polydispersity of fillers whose size distribution reflects the results of laser right scattering and SEM consistently reproduced the experimental SANS scattering profiles.
Koizumi, Satoshi; Putra, A.; Noda, Yohei; Yamaguchi, Daisuke; Tokumasu, Takashi*; Kawakatsu, Toshihiro*
no journal, ,
In order to perform a multi-scale observation on a membrane-electrolyte assembly (MEA) of polymer electrolyte fuel cell (PEFC), small-angle neutron scattering (SANS) was recently reinforced by advanced neutron optics. A focusing ultra-small-angle scattering method was developed by using a neutron lens. By combining a double crystal (Bonse-Hart) method, we are able to reach to 10 micron meter length scale, which corresponds to the size of aggregation by carbon powders in an electrode layer. Polarization analysis enables us to selectively remove incoherent scattering from hydrogen atoms and to detect coherent scattering due to ion-cluster of polymer electrolyte (Nafion) and water distribution in it. In order to output structural information in real space, we examined our SANS results by comparing images in real space obtained by low vacuum SEM and multi-scale computer simulations.
Putra, A.; Yamaguchi, Daisuke; Koizumi, Satoshi
no journal, ,
Koshikawa, Hiroshi; Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Yamamoto, Kazuya*; Sampei, Fumihiro*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Yamada, Koji*; Tanaka, Hirohisa*
no journal, ,
We prepared anion-exchange membranes based on 
-ray crosslinked ethylene-tetrafluoroethylene copolymer (ETFE) by -ray-induced graft polymerization of chloromethylstyrene (CMS) and the subsequent quaternization reaction. Little effect of radiation crosslinking was observed for the degree of CMS grafting and the quaternization ratio. Interestingly, however, the crosslinking structure in ETFE was found to lower water uptake of the resulting membranes in the OH form, thereby restricting excessive swelling during hydrazine-fuel-cell operation.
Park, J.; Takayama, Toshio*; Kudo, Kazuaki*; Maekawa, Yasunari
no journal, ,
PEMs for fuel cells prepared by radiation-induced graft polymerization of styrene onto APBI and subsequent sulfonation showed low mechanical property. PBI, exhibited no grafting reactivity, was employed as a blend polymer to APBI to increase mechanical property of PEMs. Polymer blend (1/1) film showed grafting reactivity as high as APBI even though it contained only 50% of APBI. This might be due to the enhanced graft polymerization of styrene on APBI which was promoted by the increased amorphous regions in the polymer blend film. Sulfonated polymer blend film showed similar proton conductivity with PEMs of APBI, while they showed lower water uptakes and higher mechanical property.