Elucidation of kinetic and symmetry effects on the viscosity and flow behavior of stearic and oleic triacylglycerols.

Citation:

Laziz Bouzidi, Mark Baker, Nissim Garti, and Suresh S Narine. 2015. “Elucidation of kinetic and symmetry effects on the viscosity and flow behavior of stearic and oleic triacylglycerols.” Journal of the American Oil Chemists' Society, 92, 7, Pp. 939–946.

Abstract:

The flow behavior and viscosity of TAGs contg. oleic and stearic acids were examd. in the liq. phase as well as at temps. close to the onset of crystn. by means of a temp.-controlled rheometer. Gelling and crystn. transitions were unambiguously identified by singularities in the viscosity vs. temp. curves of the TAGs. An addnl. transition between the gelling and onset of crystn. temps., attributed to the reorganization of the gel, was obsd. in the sym. TAGs only. The effect of the cooling rate, ranging between 0.1 and 5°C/min, was investigated. The flow behavior of the studied TAGs was shown to be strongly detd. by structural parameters (symmetry, degree of unsatn.). The flow behavior was also affected significantly by the cooling rate, suggesting that to certain extents the flow behavior detd. by structural parameters could be changed by manipulating the cooling rate. The study confirmed that TAG crystn. was initiated by and depends, at least in part, on complex mol. short range order transformations occurring in the melt. The findings of the study may be valuable for evaluating systems and equipment that were involved in the storage, handling and processing of materials incorporating these TAGs. [on SciFinder(R)]
Last updated on 05/27/2020