Structure and dynamics of polymers studied by X-ray, neutron, and muon techniques

Koga, Tadanori; Kanaya, Toshiji

doi:10.1016/j.polymer.2016.08.081

Cited by 1 publication

(1 citation statement)

References 23 publications

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“…First, we measure the samples in grazing-incidence (GI) geometry, where the x-ray beam reflects off the substrate interface at a glancing angle. This geometry improves the overall scattering intensity, owing to beam projection, making GI-XPCS uniquely suited for studying the dynamics of ultrathin film nanostructures [36]. Previous XPCS measurements of polymer-coated gratings [37] were performed at an incident angle less the critical angle, in order to measure surface height fluctuations (capillary waves).…”

Section: Resultsmentioning

confidence: 99%

Nanoscale viscosity of confined polyethylene oxide

et al. 2019

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Complex fluids near interfaces or confined within nanoscale volumes can exhibit substantial shifts in physical properties compared to bulk, including glass transition temperature, phase separation, and crystallization. Because studies of these effects typically use thin film samples with one dimension of confinement, it is generally unclear how more extreme spatial confinement may influence these properties. In this work, we used x-ray photon correlation spectroscopy and gold nanoprobes to characterize polyethylene oxide confined by nanostructured gratings (<100 nm width) and measured the viscosity in this nanoconfinement regime to be ∼500 times the bulk viscosity. This enhanced viscosity occurs even when the scale of confinement is several times the polymer's radius of gyration, consistent with previous reports of polymer viscosity near flat interfaces.

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Section: Resultsmentioning

confidence: 99%