AR-G2 Magnetic Bearing Rheometer

Facility/equipment: Equipment

    Description

    Introduction
    Rheology is the science dealing with the deformation and flow of matter; also: the ability to flow or be deformed. The AR-G2 is a combined motor and transducer (CMT) instrument and is a stress-controlled machine.

    Principle
    The viscoelastic properties using either transient or dynamic oscillatory tests. The most common test is the dynamic oscillatory test, where a sinusoidal stress (or strain) is applied to the material and a resultant sinusoidal strain (or stress) is measured. Also measured is the phase difference, δ, between the two sine waves. The phase lag will be 0° for purely elastic materials and 90° for purely viscous materials. However, viscoelastic materials (e.g. polymers) will exhibit an intermediate phase difference.

    Applications
    • Understanding the molecular structure–rheology relationship, e.g. long-chain branching (LCB).
    • Obtaining characteristics of materials like melting point, glass transition, rubbery-elastic characteristics, entanglement density, and processability. 
    • Correlating the rheological behavior with processing design and end-use performance.

    Details

    NameAR-G2
    ManufacturersTA Instruments

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    Magnetic bearings
    Rheometers
    Rheology
    Molecular structure
    Melting point
    Glass transition
    Transducers
    Polymers
    Processing