Rheometer

Brand / Model: Malvern / Gemini II

In dynamic rheology measurement, the strain that increases and decreases continuously is applied to a material in a certain frequency range and the phase difference between the highest voltage value and strain and voltage is measured. If the material exhibits an ideal elastic material behavior, the resulting stress is directly proportional to the strain. The voltage and strain signals are in phase. For an ideal viscous material, stress and strain rate are directly proportional and there is a 90 degree phase difference between stress and strain. The behavior of an ideal viscous material is represented by Newton's Law. For viscoelastic materials, the phase difference between stress and strain takes a value between elastic (0º) and viscous (90º) behaviors.

The stress signal of a viscoelastic material can be divided into two parts:

Elastic stress in phase with strain. Viscous stress with a 90º phase difference with the strain.

Technicial Specifications

Torque Range: 0.05 µNm - 200 mNM

Frequency Range: 1 µHz to 150 Hz

Normal Force Measurement Range: 0.001 N to 20 N (50 N options)

Temperature Range: -150 ºC to 550 ºC

Size: 52 cm x 33 cm x 37 cm

Controlled Speed ​​Range: 0.01 mrad / s - 600 rad / s

Sample Specifications

The samples to be analyzed should be of the type of polymer, polymer blends, composite, molten polymer or medium-to-high viscous liquids.