Shear effect on the thermotropic behaviour of the Synperonic A7-water system

Author： Fetter Gy.   Szilágyi A.   Zrínyi M.   Bóta A.  

Publisher： Springer Publishing Company

ISSN： 1388-6150

Source： Journal of Thermal Analysis and Calorimetry, Vol.82, Iss.2, 2005-11, pp. : 513-517

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Abstract

The thermotropic behaviour of the Synperonic A7-water (80%) system was investigated by different (SAXS, freeze-fracture, DSC) methods under the conditions of steady state and shear stress. It was found that above the melting point (about 55°C) lamellar structure exists at 80°C, which was interpreted as a consequence of phase separation. The phase separation is more extended if the sample was sheared. The shear process affects the thermotropic behaviour of the system drastically. Above the melting point the thermal treatment terminates the shear prehistory. The shear processes were executed in a shear cell constructed in two variants for small angle X-ray scattering and for freeze-fracture methods.

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