日本ゴム協会誌
Print ISSN : 0029-022X
総説
ゴム製品そのものを観察する新しい顕微装置 ―動的核スピン偏極コントラスト変調による中性子小角散乱―
小泉 智能田 洋平前田 知貴稲田 拓実
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ジャーナル 認証あり

2021 年 94 巻 12 号 p. 387-394

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Ibaraki university developed the novel neutron microscope on the instrument iMATERIA at MLF of J-PARC, which was originally a powder diffractometer, recently reinforced by detecting small-angle scattering. The method of dynamic nuclear polarization (DNP) for protons was combined with small angle neutron scattering (SANS)(DNP-SANS). In a long course of history of DNP, our activity is the world's first challenge to incorporate DNP-SANS for routine industry uses. This “neutron microscope" provides us multiple reciprocal space images by changing scattering lengths of proton, in turn by varying “contrast" of individual scattering components. Conventionally, for the contrast variation, chemical treatments are required to substitute protons with deuterons. The DNP approach is suitable for industry application (for example to observe tire rubbers), because we do not need highly-specialized deuterium substitution. In this article, we describe theoretical background of DNP including scattering functions and the experimental of 7T super-conductive magnet, NMR to evaluate proton spin polarization, and microwave to change polarization. The sample preparation to dope radicals into sample specimens are necessary. We review the studies on homopolymers of polystyrene and polyethylene, poly (styrene-b-isoprene) diblock copolymer, and vulcanized SBR rubber.

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