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A Novel Application of the Quartz Crystal Microbalance for Determining the Rheological Properties of the Highly Viscous Liquids

100%

Barzinjy A., Zankana M.

Traditional methods such as rotational viscometer and other viscometer methods are limited in their ability to investigate rheological properties of high viscous liquids. This study introduces a new approach to overcome these obstacles. Deep eutectic solvents suffer from high viscosity and they are relatively expensive. Therefore, there is a requirement to both reduce the volumes of samples required and increase the accuracy of the technique at high viscosities. Quartz crystal microbalance techniques have been applied because they provide quick recording, the potential for collecting a large amount of data in a short time. Furthermore, the quartz crystal microbalance microviscometer has the advantage over most other methods of viscometry not in its precision of absolute viscosity measurement but in the very small amount of sample liquid needed for investigation. To test the precision of quartz crystal microbalance a comparison must be made between readings obtained with a rotational viscometer set up alongside. In this investigation a series of deep eutectic solvents with various viscosities and physical characteristics have been tested. The influence of the addition of water to the liquids was also assessed.

Rheological Behavior of Modified Starch/EVA Blends

80%

Aydin I., Ergin M., Altun M.

vol. 125

issue 2

503-505

There is a current research tendency towards the biodegradable thermoplastic materials from renewable resources since the environmental restraints play vital role in recent years. Starch is one of the renewable resources and abundantly available in the form of plant products. It is possible to blend starch with various thermoplastic materials to achieve such aims. In this study, an ethylene-vinyl acetate (EVA) copolymer resin (Luvax 40 W, DuPont) was blended with a modified starch (Maize Starch, Pendik Nisasta) in various amounts by means of a single screw extruder with different screw speeds. For this purpose, first starch was modified in a four neck spherical glass reactor. Modified starch was then blended with the EVA copolymer resin. Rheological analyses of these composites were performed by means of an AR G2 rheometer (TA Instruments) with parallel-plate geometry in a steady state condition. Rheological behavior and properties were recorded. The changes in viscosity with different temperatures, stress and strain dependence as well as general constitutive material behavior were determined in detail. As a result, the best formulation and process conditions were determined for the reasonable processability of starch/EVA blends from the obtained rheological data.

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2 Acta Physica Polonica A

1 2016

1 2014

1 Altun M.

1 Aydin I.

1 Barzinjy A.

1 Ergin M.

1 Zankana M.

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A Novel Application of the Quartz Crystal Microbalance for Determining the Rheological Properties of the Highly Viscous Liquids

Rheological Behavior of Modified Starch/EVA Blends