Hierarchically self-organized dissipative structures of filler particles in poly(styrene--butadiene) rubbers

Yamaguchi, Daisuke; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*; Noda, Yohei*; Koizumi, Satoshi*; Hashimoto, Takeji*

Macromolecules, 50(19), p.7739 - 7759, 2017/10

https://doi.org/10.1021/acs.macromol.7b01052

We elucidated the spatial distribution of filler particles in cross-linked poly(styrene--butadiene) rubbers (SBR) developed under a typical fillers/rubbers compounding process as one of dissipative structures formed under a stress field imposed on the given system. The dispersion state of the fillers in SBR was clarified on the basis of hierarchical structures consisting of five structure levels. More specifically, it has the following characteristics depending on the specific interactions: Small, compact clusters build up compact mass-fractal structures, while large, loose clusters build up open mass-fractal structures.

Mechanical properties of fuel debris for defueling toward decommissioning

Hoshino, Takanori; Kitagaki, Toru; Yano, Kimihiko; Okamura, Nobuo; Ohara, Hiroshi*; Fukasawa, Tetsuo*; Koizumi, Kenji

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 6 Pages, 2015/05

Bacterium organizes hierarchical amorphous structure in microbial cellulose

Koizumi, Satoshi; Zhao, Y.; Tomita, Yoko*; Kondo, Tetsuo*; Iwase, Hiroki; Yamaguchi, Daisuke; Hashimoto, Takeji

European Physical Journal E, 26(1-2), p.137 - 142, 2008/05

https://doi.org/10.1140/epje/i2007-10259-3

no abstracts in English

A Complemental use of SANS and SAXS for the analysis of multi-component hierarchical structure

Yamaguchi, Daisuke; Noda, Yohei; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*; Yuasa, Takeshi*; et al.

no journal, , 

Nowadays industrial materials tend to include a variety of additives and to be a composite of them to satisfy a high request for intelligent function and durability. Elucidation of such a multi-component and hierarchical structure is really a tough work but indispensable to learn the fundamentals of relation between the structure and property and to attain a reasonable improvement of those materials. Combined use of small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) often gives a good clue to decompose the total scattering of the organic/inorganic composite into the partial scattering from a particular component. Two examples will be demonstrated here for extracting the structural information from the composite specimen via this method; one is the distribution of the dopant nitrogen atoms in the porous photocatalyst and the other is the dispersion state of fillers in the rubber matrix.

Structural analysis of fuel-efficient tire rubber in nanometer scale by spin contrast variation technique

Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Shamoto, Shinichi; Koizumi, Satoshi; Yuasa, Takeshi*; Tominaga, Tetsuo*; Sone, Takuo*

no journal, , 

We applied proton spin contrast variation technique to silica filled SBR rubber, which is widely used for a fuel-efficient tire. In this technique, vapor sorption of TEMPO radical as an electron spin source played an important role for achieving high degree of proton spin polarization. As a result, we successfully evaluated the dispersion state of silica particles, which is known to be a key factor for tire's fuel efficiency.

Contrast variation in small angle neutron scattering by polarizing proton spins; Structural analysis of silica-filled SBR rubber

Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Shamoto, Shinichi; Koizumi, Satoshi*; Yuasa, Takeshi*; Tominaga, Tetsuo*; Sone, Takuo*

no journal, , 

The outline of contrast variation method by dynamic nuclear polarization, which we have developed, will be explained. As a recent achievement, we applied this technique to silica-filled SBR rubber, which is widely used for fuel-efficient tire, and succeeded in revealing its detail structure which have not been obtained. Additionally, we will mention merits which will be obtained by introducing new techniques in solid state NMR field.

Small-angle neutron scattering as a useful tool for green innovation materials

Yamaguchi, Daisuke; Noda, Yohei; Koizumi, Satoshi*; Yuasa, Takeshi*; Sone, Takuo*; Tominaga, Tetsuo*; Takenaka, Mikihito*; Amino, Naoya*

no journal, , 

Using a combined ultra-small-angle and small-angle scattering methods with both of neutron and X-ray probes, we characterized hierarchical structures of silica and/or carbon black filler particles dispersed in solution polymerized poly(styrene-random-butadiene) rubber (SBR). Two types of SBR were employed for the preparation of filler/rubber compounds; one possesses a newly developed functionalized chain-end (f-SBR), which has an affinity for filler particles and the other is a conventional SBR (n-SBR) without any special interaction with fillers. Combined small-angle scattering measurements clarified that the average-size of aggregated fillers dispersed in f-SBR matrix is smaller than that dispersed in n-SBR matrix.

Small angle neutron scattering study with contrast variation by dynamic nuclear polarization; Application to silica-filled styrene-butadiene rubber

Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Shamoto, Shinichi; Koizumi, Satoshi; Tominaga, Tetsuo*; Sone, Takuo*; Yuasa, Takeshi*

no journal, , 

We will report the result of the small angle neutron scattering study of silica-filled SBR rubber with contrast variation by dynamic nuclear polarization. As a result of this study, we succeeded in precise evaluation of silica particles' dispersion state in composite rubber materials, which has been known to have strong effect on the fuel-efficiency or tire rubber.

Measurements of ion detection efficiencies of a tapered microchannel-plate with a high open-area-ratio

Matoba, Shiro; Narumi, Kazumasa; Saito, Yuichi; Yamada, Keisuke; Chiba, Atsuya; Koizumi, Tetsuo*; Takahashi, Karin*; Ishikawa, Manabu*; Shiromaru, Haruo*; Kato, Ryoya*; et al.

no journal, , 

no abstracts in English

Study of silica particle dispersion in styrene-btadiene rubber by spin contrast variation technique

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.