Study of meso-scale structure of soft-matter materials using dynamic nuclear polarization and small-angle neutron scattering

Kumada, Takayuki   ; Noda, Yohei; Hashimoto, Takeji; Koizumi, Satoshi

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.