高分子液晶のレオロジーの数値解析 : 第1報, せん断流特性

概要

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Finite difference solutions to the Doi equation without closure approximations in shear flow are obtained. The Maier-Saupe potential is used to model the mean-field potential which induces the nematic state. Under equilibrium conditions, an isotropic phase is stable when the nematic potential intensity U is less than 4.49 and the lowest value of U for which a nematic phase is stable is 5. In the presence of shear flow, three different types of rheological behavior exist depending on the magnitude of shear rate: aligning, wagging and tumbling. With increasing shear rate, in the aligning regime, the preferred angle has a maximum and the order parameter shows a monotonic increase. For U=6, the transitions from tumbling to wagging and wagging to aligning occur at shear rates of approximately 16 and 32, respectively. The first normal stress difference has a negative value in moderate shear rates which include the whole regime of wagging and a part of the tumbling and aligning regimes.
社団法人日本機械学会の論文
1996-02-25