A VANE-IN-CUP APPROACH TO MEASURE VISCOELASTIC PROPERTIES OF GELATIN GELS THROUGH TORQUE-TIME RESPONSES FROM BROOKFIELD YR-I VISCOMETER

作者：Tanjore Deepti; Daubert Christopher R^*

来源：Applied Rheology, 2011, 21(6): 63172.

DOI：10.3933/ApplRheol-21-63172

• viscoelasticity
• vane
• shear modulus
• phase angle
• deformation zone

Viscoelastic properties are traditionally measured using sophisticated instrumentation, and the high cost of these rheometers may limit utility. This research attempts to enable viscometers that can provide a torque-time response, with vane attachment and a recommended cup size, to measure viscoelastic properties. Phase angles and shear moduli of model systems (gelatin and polyacrylamide gels) were calculated using torque-time response and deformation zone concept. The methods were applied to data obtained from Brookfield YR-I viscometer and the calculated values were compared with the data obtained from oscillatory testing on a stress controlled rheometer. The methods were improved in several areas by testing different cup sizes, rotational speeds, and viscometers and correcting torque-time responses to obtain most accurate results possible. The developed method, along with the torque-time response obtained from the viscometer, was capable of measuring viscoelastic parameters for the tested materials and further development could design a new quality control device directed towards viscoelastic property measurement.

• 出版日期2011