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Rotational rheometry is a powerful technique for the measurement of complex shear rheology across all material types – sensitive enough to measure the viscosity of dilute polymer solutions, and yet robust enough to measure the viscoelasticity of high modulus polymers or composites. Rotational rheometry is ideal for discerning structural and compositional changes of materials, which can be critical controlling factors in flow and deformation properties, and ultimately product stability and performance.
The basics of the rotational rheometry technique are as follows:
Rotational rheometry also enables other rheological properties to be evaluated, including yield stress, thixotropy, creep and recovery and stress relaxation.
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Squeeze flow rheometry involves compressing a material between two parallel plates in order to determine its rheological properties. Squeeze flow measurements can be made with a rotational rheometer having suitable axial capabilities (normal force an...
This Whitepaper discusses the various approaches available to measure yield stress, and the practical measurement set-up and test parameters to obtain relevant, robust and reliable yield stress data using a rotational rheometer.
Dr Steve Carrington of Malvern Instruments and Prof. D. J. McClements of the University of Massachusetts describe the use of rheology to measure how food changes during mastication and to compare the rheological behaviour of low fat sauces with consu...
This whitepaper discusses the use of rheology for optimizing the performance of paints and coatings
This application note shows how using a solvent trap can be used to prevent sample drying/solvent loss during extended testing, helping to ensure that only rheological changes are being measured and not artifacts resulting from drying of the sample a...
(Webinar - Recorded)
Making squeeze flow measurements on a rotational rheometer
(September 24 2015)
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