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- W2013292006 abstract "A compact low-field NMR rheometer has been developed for process analysis by means of rheometry and NMR relaxometry. On the basis of an NMR capillary rheometer for close to ambient conditions, a flow-through system with an inductively coupled probe head for elevated temperatures (up to 423 K) and pressures (2 MPa) was realised. A fast measurement of the Abel transform of the velocity-dependent phase factor in the capillary is performed using a 2-axes-gradient system. Assuming Ostwald-de Waele or Hershel–Bulkley behaviour the power law index and (if applicable) the rheological yield point is extracted. Values are validated against data from a rotational viscosimeter. During polymerisation the increasing solid content provides information about the progress of reaction while the interaction between the polymer and the water phase manifests itself via the relaxation time of the water phase. Both parameters can be determined from a solid echo followed by a CPMG train. NMR relaxometry on flowing samples of solutions and dispersions is confronted with complex effects as spatially dependent excitation and detection efficiency and incomplete polarisation especially for slow relaxing liquids. A theoretical description of the effects is developed and used for a correction of the magnetisation decay curves. It requires knowledge of the velocity probability density function which is known if the flow profile has been determined. In order to reduce incomplete polarisation effects, a prepolarizer using specially designed Halbach magnets is used." @default.
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- W2013292006 date "2013-09-01" @default.
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- W2013292006 title "Online Rheo-TD NMR for analysing batch polymerisation processes" @default.
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- W2013292006 doi "https://doi.org/10.1016/j.micromeso.2013.03.001" @default.
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