| Summary: | 碩士 === 東海大學 === 化學工程學系 === 93 === The rheological behavior and morphology of the mixture of a polymer, poly (butyl acrylate) (PBA), and a cholesteric liquid crystal, cholesteryl oleyl carbonate (ChOC) were investigated. The steady rhological behavior was studied by rotational rheometer RDAⅡ. To study the morphology, we used optical microscope direct to investigate the droplet morphology in flow fields.
Steady shear viscosity roughly shows three different types of rheological behavior depending on concentration. The mixture of poly (butyl acrylate) and polydimethylsiloxane was prepared as a reference, to contrast the influence of composition and morphology on rheological properties. Several theoretical model were adapted to predict the rheological property. The predictions of the models were found proper only when the fluids behaved as a Newtonian fluid and at low shear retes and low concentration.
From optical investigation we knew that the role of droplet morphology on the rheological behavior was important. In contrast to solid particals, liquid droplets can adapt partially to the flow field by the four following mechanisms: internal circulation, deformation, break-up and coalescence.
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