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Fixed window scans

Dynamics of local methyl groups and extended segments of a polymer in a porous material

Elastic or inelastic fixed window scans give a quick overview of the onset of motions faster than the time scale corresponding to the energy resolution (∼4 ns).

The elastic scans shown illustrate how local methyl group dynamics and extended segmental dynamics of a polymer are differently influenced by spatial restrictions in a porous material. It can also be seen that the crystallisation (upwards jump for bulk) is suppressed when confinement volume is sufficiently small (see figure).

Ref.: Schönhals, A., Goering, H., Schick, C., Frick, B. & Zorn, R.; European Physical Journal E, 2003, 12, 173-178.