Synchrotron radiation (SR) produces light that is highly brilliant than conventional X-ray sources. Photon energy covers from soft X-ray, tender X-ray to hard X-ray. By utilizing wide energy range and high quality of light, various scattering and spectroscopic methods can be applied to various soft materials. In this presentation, our recent researches on application of synchrotron X-ray scattering and spectroscopy to soft matter are summarized. Structure of nanocomposite elastomer film consisting of a spherical silica nanoparticle (SiNP) and densely-grafted polymer chains bearing hydrogen-bonding side-groups capable of physically crosslinking, was investigated by in-situ ultra-small angle X-ray scattering(USAXS) during uniaxial stretching process. USAXS revealed that the molded SiNP formed lattice structure. X-ray photon correlation spectroscopy (XPCS) of nanocomposite film showed restricted motion of SiNP in the nanocomposite film. Grazing incidence X-ray diffraction (GIXD) is a powerful tool to characterize the surface molecular aggregation states of polymer films. Tender X-ray with wavelength of 0.25-0.62 nm has potential advantage that penetration depth gradually increases above the critical angle. Tender X-ray GIXD was successfully applied to side chain crystalline polymer films for depth profiling of the crystalline state. Soft X-ray emission spectroscopy (XES) was employed to characterize the local electron structure of water confined in a charged polyelectrolyte brush. The XES spectrum of water confined in a poly(2-(methacryloyloxy)ethyl trimethylammonium chloride) (PMTAC) brush was compared with those of the dry PMTAC brush in vacuum, bulk water and ice. The results indicated that the water confined in the PMTAC brush is highly hydrogen bonded like ice. On the other hand, water molecules in zeitterionic sulfobetaine polymer brush showed hydrogen-bonding configuration similar to bulk water.

Application of synchrotron radiation X-ray scattering and spectroscopy to soft matter

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.