An automated dynamic viscometer with air bearing and inductive transducers for angular displacement detection |
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Authors: | H. J. E. Smits D. van den Ende G. J. Beukema E. G. Altena P. H. J. Spitteler |
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Affiliation: | (1) Rheology Group Faculty of Applied Physics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;(2) Present address: General Electric Plastics, Bergen op Zoom, The Netherlands |
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Abstract: | A dynamic viscometer is described, with which the dynamic moduli in the frequency range from 2 × 10–3 to 10 Hz can be determined for liquids with 10–3 Pa< |G* | <102 Pa. Due to the application of an air bearing and inductive transducers for the detection of the angular displacement of both the drive and the measuring cylinder a sensitive apparatus has been made. Very small strains (0 10–3) can be applied and only a small amount of sample (4 ml) is needed. The operation of the apparatus is fully computer-controlled, thus, long runs at various frequencies and temperatures are possible without operator intervention. The theoretical background, calibration procedure, and operation window are described. A presentation of some measurements on two polyisoprene/polystyrene triblock copolymer solutions concludes the work. |
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Keywords: | Complexviscosity dynamicviscometer rheometer triblockcopolymer transducer |
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