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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:

  • The sample is loaded into the gap of a measuring system, or geometry – such as a cone and plate or a concentric cylinder system – specifically designed to impose simple shear flow when rotated.
  • The measuring system is supported by a virtually frictionless air-bearing, and driven by an ultra-low inertia motor, coupled to an ultra-high precision position encoder. The sample and measuring system are also temperature controlled.
  • Various rheological characteristics of the sample can be determined by rotating, oscillating or applying a step function to the measuring system – either by controlling motor torque (stress controlled rheometry) or position change (strain controlled rheometry).
  • Common test modes are rotational (or flow) to measure shear viscosity, and oscillation to measure dynamic material properties such as viscoelastic modulus and phase angle.

Rotational rheometry also enables other rheological properties to be evaluated, including yield stress, thixotropy, creep and recovery and stress relaxation.

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Rheology masterclass 1 - The basic of viscosity Webinar - Live (English)

Rheology is defined as the science of deformation and flow and in particular refers to materials that show viscoelastic or non-Newtonian behaviour when stressed. Such materials include suspensions, emulsions, polymer solutions and foams to name but a...

Product:
Kinexus lab+,Kinexus pro+,Kinexus ultra+
Date:
March 31 2015
Language:
English

Keywords: English Kinexus pro+ Kinexus ultra+ Rheology and viscosity Rheometry - rotational Webinar - Live Eastern Time Kinexus lab+ 

Rheological characterization of dispersed systems with novel geometries Webinar - Recorded (English)

This webinar discusses the use of the flexible gapping system of Kinexus to allow the use of a range of novel geometries to measure otherwise difficult to characterise disperse systems. Comparisons will be made on model systems, a zero-shear viscosit...

Product:
Kinexus lab+,Kinexus pro+,Kinexus ultra+
Date recorded:
March 17 2015
Language:
English

Keywords: English Kinexus pro+ Kinexus ultra+ Rheology and viscosity Rheometry - rotational Webinar - Recorded Eastern Time Kinexus lab+ 

Combined Use of Rheometry and GPC/SEC for Characterising Ionic Polysaccharides Poster (English)

This poster shows how Rheometry and GPC can be complementary tools for characterizing the behaviour of polysaccharides in solution


Keywords: Polymer solutions English Poster Viscotek range Molecular weight Rheology and viscosity Gel Permeation Chromatography Rheometry - rotational Polysaccharides 

Characterizing Opthalmic Viscosurgical Devices (OVDs) using a rotational rheometer Application Note (English)

This application note discusses the methodology and results for the rheological characterization of Opthalmic Viscosurgical Devices (OVDs) according to the International Standard ISO15798:2013


Keywords: English Application Note Kinexus range Rheology and viscosity Rheometry - rotational Ophthalmic 

Optimizing High-performance Ceramic Inkjet Inks Article (English)

This article highlights how engineering high performance ceramic inkjet inks relies on measuring viscosity across the broad range of shear rates experienced during printing. This shear range can be accessed by combining rotational rheometry for low s...


Keywords: English Article Kinexus range Zetasizer range Rheology and viscosity Dynamic Light Scattering Rheometry - rotational Paints, inks and coatings m-VROCi Rheometry - microfluidic flow 
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Rheology masterclass 1 - The basic of viscosity
(March 31 2015)

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