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Kumada, Takayuki; Noda, Yohei; Hashimoto, Takeji; Koizumi, Satoshi
no journal, ,
We carried out small-angle neutron scattering (SANS) study of dynamically proton-spin polarized polyethylenes (PE) doped with TEMPO. Coherent scattering profiles, which reflect crystalline domain structures in PE samples, were kept unchanged by the proton polarization, but their intensities increased by 3 or 6 at P = +0.26 and -0.26, respectively. The increase is only 1/13 of theoretical prediction on the assumption that polarization is homogeneous through the PE sample. This result suggests that P in amorphous parts of PE, where TEMPOs were localized and dynamic nuclear polarization (DNP) took place, should be higher than that in crystalline parts by 0.03.
Noda, Yohei; Kumada, Takayuki; Hashimoto, Takeji; Koizumi, Satoshi
no journal, ,
For the determination of meso-scale (1 
100 nm) distribution of radicals, we have developed a small-angle neutron scattering (SANS) system with polarizing spins of a sample by a dynamic nuclear polarization (DNP) technique, in which a sample is irradiated by a milliwave (94GHz) at 1.4K and 3.3Tesla. We will report the result of the measurement of PE samples doped with TEMPO, whose SANS profile is expected to increase remarkably by prolarizing the protons. As a result, the SANS profile increased by polarizing the protons, and the neutron transmission and the incoherent scattering intensity agreed well with the theoretical prediction.